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Uniting the skies

Spectrograph installed at South Africa’s Boyden Observatory to aid App State, UFS astrophysicists

App State professor Dr. Richard Gray designed, built and installed the astronomical instrument

View larger image

The 1.5-meter telescope housed in the University of the Free State’s Boyden Observatory in South Africa. App State professor emeritus and astrophysicist Dr. Richard Gray designed and built a spectrograph for the telescope, which he installed and commissioned this spring. This work, supported by Gray’s 2019–20 Fulbright award, began in fall 2019 and was put on hold in 2020 due to the global pandemic. Photo provided by Dr. Richard Gray

“Astronomers are very interested in questions of origins — not only how stars form but also how planets form, because the two happen at the same time. I think it’s fair to say that probably 90% of what we know about objects in the universe comes through spectroscopy.”

Dr. Richard Gray, astronomer and professor emeritus in App State’s Department of Physics and Astronomy

By Jessica Stump
Posted June 30, 2023 at 11:04 a.m.

BOONE, N.C. — A spectrograph designed, built, installed and commissioned by Appalachian State University astrophysicist Dr. Richard Gray may help scientists across the world — including those at App State and the University of the Free State (UFS) in South Africa — gain greater insights into the origins and evolution of celestial objects such as stars, planets and galaxies far, far away.

“Astronomers are very interested in questions of origins — not only how stars form but also how planets form, because the two happen at the same time. I think it’s fair to say that probably 90% of what we know about objects in the universe comes through spectroscopy.”

Dr. Richard Gray, astronomer and professor emeritus in App State’s Department of Physics and Astronomy

This spring, Gray successfully commissioned a spectrograph that he designed and built for the 1.5-meter telescope housed at UFS’ Boyden Observatory — work that began in 2019, as part of Gray’s Fulbright project “Uniting the Sky: An Astronomical Partnership with the University of the Free State.” The project was put on hold in 2020 due to the COVID-19 pandemic, as well as a malfunction of one of the telescope’s internal mechanisms.

The project presents “opportunities for training a new generation of astronomers at both institutions, drawing especially from underrepresented groups in Appalachia and South Africa,” Gray said.

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Pictured at top: App State’s Dr. Richard Gray, professor emeritus in the Department of Physics and Astronomy, with the spectrograph he designed and built for the 1.5-meter telescope housed at the University of the Free State’s Boyden Observatory in South Africa. Pictured at bottom: A top view of the spectrograph and its internal components. Images courtesy of Boyden Observatory and the Naval Hill Planetarium

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Dr. Richard Gray, professor emeritus in the Department of Physics and Astronomy at App State, right, works with Dr. Pat Van Heerden, senior subject matter expert in the Department of Physics at South Africa’s University of the Free State, to prepare the spectrograph that he designed and built for installation on the 1.5-meter telescope at Boyden Observatory in South Africa. Gray’s work, which began in 2019 and was put on hold in 2020 due to the global pandemic, was supported by his 2019–20 Fulbright award. Gray was able to return to the observatory this spring to commission the instrument. Photo provided by Dr. Richard Gray

He explained that the long-term benefits for both App State and UFS center on collaborative research in astronomy and other STEM (science, technology, engineering and math) fields, as well as virtual and in-person exchanges for faculty and students.

“Astronomers are very interested in questions of origins — not only how stars form but also how planets form, because the two happen at the same time,” said Gray. “I think it’s fair to say that probably 90% of what we know about objects in the universe comes through spectroscopy.”

An astronomical spectrograph “uses an optical element, such as a prism or diffraction grating, to disperse the light from a star or galaxy into the spectrum, or into the rainbow of colors,” Gray explained. “The light is then focused on a highly sensitive charged-coupled device (CCD) camera that creates an image of the spectrum, which allows astronomers to analyze numerous details of the astronomical object being observed.”

The App State–UFS collaboration includes access to the Boyden telescope for App State astronomers and reciprocal access by UFS astronomers to the 32-inch research telescope at the university’s Dark Sky Observatory (DSO), which also features a spectrograph designed by Gray. This would make the entire sky accessible to scientists at both institutions. Before the installation of the spectrograph, UFS and App State astronomers could see only limited parts of the skies of the northern and southern hemispheres, respectively.

Remote access capabilities for the Boyden telescope are being explored. Currently, the dome that covers the Boyden telescope is operated by a hand crank and would need to be upgraded to an automated system.

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Dr. Richard Gray, professor emeritus in App State’s Department of Physics and Astronomy, center, holds the polarimeter he designed and built to work with the spectrograph installed on the 1.5-meter telescope at the University of the Free State’s Boyden Observatory in South Africa. He installed and commissioned the spectrograph in spring 2023, continuing the Fulbright work he began in the 2019–20 school year. Gray is pictured in the observatory with UFS students and faculty. Photo courtesy of University of the Free State

The making of a spectrograph

More than 100 parts compose Gray’s spectrograph, which he built over the course of six months using equipment in App State’s College of Arts and Sciences Machine and Electronic Shop and with the help of retired App State machinist Dana Greene and retired App State electronics technician Mike Hughes. The UFS Department of Electronics and Instrumentation also helped build several of the instrument’s components, with the spectrograph’s materials fully funded by App State’s College of Arts and Sciences and the college’s Department of Physics and Astronomy.

Commissioning of the spectrograph involved calibrating and optically aligning the instrument, as well as performing multiple tests to ensure it works as designed. The instrument is now fully operational and can be controlled remotely.

Additionally, Gray designed and built a polarimeter that — once installed inside the spectrograph — converts the instrument into a spectropolarimeter, which allows scientists to study and analyze the polarization of light emitted by celestial objects.

“For instance, scientists can study the effect of magnetic fields in astronomical sources, which introduce various polarization signatures that can be detected using the polarimeter,” said Gray.

Numerous UFS students and professors were involved in the installation of the spectrograph, Gray said, and spent much time with him in the observatory, learning how the instrument works.

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Dr. Richard Gray, professor emeritus in App State’s Department of Physics and Astronomy, left, discusses the newly installed spectrograph with Hélène Szegedi, lecturer in the Department of Physics at South Africa’s University of the Free State. Gray designed and built the instrument for the 1.5-meter telescope at UFS’ Boyden Observatory, with support from his 2019–20 Fulbright. He installed and commissioned the spectrograph in spring 2023 and the instrument is now fully operational. Photo courtesy of University of the Free State

Shining new light on stellar, planetary evolution

Spectroscopy can help bridge the gaps in scientists’ understanding of stellar and planetary evolution — the physical and chemical changes that stars and planets undergo over the course of their lifetimes, from birth to death. It could even play a key role in identifying life beyond Earth, according to NASA.

By examining the spectrum of an astronomical body, astrophysicists can determine its temperature, density and age, as well as the speed at which it is moving, its chemical composition and any magnetic field that may be present, Gray shared.

He offered an example of how the combined power of a spectrograph and polarimeter can be used to study stellar objects:

“Young stars, which are still contracting out of clouds of dust and gas, have light that is quite often polarized because magnetic fields wend their way through those clouds. By looking at the polarization properties, we can learn something more about how stars form, and then, by extension, how planets form,” said Gray.

Dr. Pieter Meintjes, senior professor in UFS' Department of Physics, said, “The Boyden spectropolarimeter provides a unique opportunity to expose astronomers from App State to the southern sky. Rich star fields of the galactic center, as well as the Magellanic Clouds (dwarf galaxies), pass right overhead in the winter months of the Southern Hemisphere.”

He added, “UFS research focused on multi-wavelength studies of high energy galactic and extragalactic sources will greatly benefit from optical spectroscopic and polarimetric observations. The Boyden spectrograph provides a very powerful diagnostic tool to unravel the secrets hidden within these sources.”

Meintjes will use the newly installed spectrograph to study binary star systems, as well as active supermassive black holes. UFS professor Dr. Brian van Soelen, also in the Department of Physics, will use the instrument for his research on high-energy and very high-energy astrophysics.

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Dr. Richard Gray, professor emeritus in App State’s Department of Physics and Astronomy, left, and Dr. Pieter Meintjes, senior professor in the Department of Physics at South Africa’s University of the Free State, with the spectrograph that Gray designed and built for the 1.5-meter telescope at UFS’ Boyden Observatory. Gray holds the polarimeter he designed and built for the spectrograph, which, once installed inside the instrument, converts the spectrograph into a spectropolarimeter. Photo courtesy of University of the Free State

App State–UFS astronomical collaborations

Plans are in place for in-person exchanges between astronomy graduate students at App State and UFS, with UFS students visiting App State to work with the 32-inch DSO telescope and App State students traveling to UFS to use the Boyden telescope. This may eventually lead to exchanges between undergraduate students as well, according to Gray.

The first step in this process will begin with virtual exchanges between App State and UFS faculty, Gray said. Beginning this fall, UFS faculty will deliver virtual lectures on high-energy astrophysics to advanced astronomy students at App State, and App State faculty will give lectures in their areas of expertise at a future date.

Although the Boyden telescope’s spectropolarimeter is not the first of its kind in South Africa, it marks an important move in making such technology more accessible for scientists across the world.

Gray explained that many of the world’s astrophysicists seek observational time on the largest optical telescope in the Southern Hemisphere, known as SALT (Southern African Large Telescope), which is located approximately 500 miles southwest of Boyden Observatory, in Sutherland. However, it is extremely difficult to secure extended periods of time on this telescope, he said.

Having regular access to observational time on the spectrograph-outfitted Boyden telescope means that App State and UFS astrophysicists, as well as other scientists, can conduct long-term surveys of objects — over months, or even years, which is important for astronomical research, Gray said.

App State’s long-term relationship with UFS formally began in 2009, with the signing of a partnership agreement. Examples of past collaborations between the two institutions include:

  • The federally funded mountains-to-mountains project, which involved developing two new master’s degree programs at UFS, creating a leadership mentoring program for young Black women in academia, conducting doctoral research projects in the High Country and South Africa, and installing weather stations in South Africa’s Maloti-Drakensberg Mountains. The project, which engaged faculty, staff and graduate students at both institutions, took place over the 2020–21 and 2021–22 academic years.
  • The University Staff Doctoral Program (USDP) — a joint program of UFS and App State that aims to increase the number of university academics in South Africa who hold doctoral degrees. Scholars who participated in the program in 2019–20 were co-supervised by App State faculty members during their U.S. doctoral work at the university and until the completion of their degrees. UFS invited App State to participate in the USDP project under the auspices of the United States–South Africa Higher Education Network collaboration program.

UFS is the only academic institution in South Africa with access to a 1.5-m telescope paired with a spectrograph.

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Dr. Richard Gray, professor emeritus in App State’s Department of Physics and Astronomy. Photo by Chase Reynolds

About Dr. Richard Gray

Dr. Richard Gray will retire from App State this summer, after 34 years of service in the Department of Physics and Astronomy. He has taught courses in environmental and computational physics, thermal physics, techniques of astronomical spectroscopy, astrophysics, planets and exoplanets and computational astronomy. He served on four students’ Honors College thesis committees between 2014 and 2017.

His research is in the field of stellar spectroscopy, with interests that include the discovery and classification of chemically peculiar stars, Lambda Bootis stars in particular, which is a group of stars that show marked low abundance, or unusually low abundance of iron peak elements in their surface layers. In addition to his research on Lambda Bootis stars, Gray monitors a set of young solar analogs (YSAs) in an effort to learn more about the space environment of the Earth when life was first forming nearly 4 billion years ago.

During his time at the university, Gray has designed and constructed four astronomical spectrographs, three of which are in use in telescopes in the Dark Sky Observatory and one that is used for the 16-inch telescope in the university’s Rankin Science Observatory.

He shared that he developed his first spectrograph around the age of 15.

“I got interested in astronomy when I was about 13 years old or so and then became really interested in spectroscopy. My parents gave me a little diffraction grating for my birthday, and I just thought that was so fantastic,” he said.

He is a member of the International Astronomical Union and American Astronomical Society, and is a fellow of the Royal Astronomical Society. He is also an international collaborator on the LAMOST-Kepler project, which is obtaining spectra of tens of thousands of stars using the Chinese LAMOST spectroscopic telescope in the Kepler field.

Gray holds a B.A. in mathematics from Washington State University and earned both his M.S. and Ph.D. in astronomy from the University of Toronto. He is an affiliated professor of the University of the Free State and has supervised the work of several UFS doctoral students studying astronomy.

App State Fulbright Scholar Program
App State Fulbright Scholar Program

The Fulbright Program is the flagship international educational exchange program sponsored by the U.S. government and was created to increase mutual understanding between the people of the United States and the people of other countries.

At App State, the program is administered through the Office of International Education and Development (OIED) and Office of Research.

Learn more
2019–20 Fulbright awardee Dr. Richard Gray to ‘unite the sky’ through astronomical partnership with South Africa’s UFS
2019–20 Fulbright awardee Dr. Richard Gray to ‘unite the sky’ through astronomical partnership with South Africa’s UFS
Nov. 1, 2019

During the 2019–20 academic year, Appalachian astronomy professor Dr. Richard Gray will teach and perform research at the University of the Free State in South Africa as part of his Fulbright award.

Read the story
$500K grant funds mountain-to-mountain collaboration between App State and South Africa’s UFS
$500K grant funds mountain-to-mountain collaboration between App State and South Africa’s UFS
Oct. 27, 2020

App State and South Africa’s University of the Free State (UFS) will strengthen their existing partnership through a two-year mountain-to-mountain project that has received $500,000 in grant support. Read more about the project, which will engage faculty, staff and graduate students at both institutions.

Read the story
App State honored as a Top Producer of Fulbright scholars, students for 2022–23
App State honored as a Top Producer of Fulbright scholars, students for 2022–23

The university is one of 3 master’s institutions nationwide to receive the honor

Feb. 15, 2023

App State has been named a Top Producer of Fulbright students and scholars for 2022–23, with two faculty and four alumni receiving a Fulbright to teach, perform research and/or study abroad. This marks the third time the university has received this honor in the past four academic years.

Read the story
Dark Sky Observatory
Dark Sky Observatory

Established in 1981, App State's Dark Sky Observatory (DSO) is the research facility used by faculty and their students to conduct observational research in astrophysics. It is equipped with four telescopes, each used regularly for CCD imaging and photometry, with spectrographic instrumentation also used at the 32-inch.

Learn more

About the Department of Physics and Astronomy

The Department of Physics and Astronomy’s curriculum has an applied nature that includes a core of fundamental physics courses and laboratory experiences. The department prepares graduates for a variety of scientific, teaching or engineering professions, as well as future educational endeavors. Learn more at https://physics.appstate.edu.

About the College of Arts and Sciences

The College of Arts and Sciences (CAS) at Appalachian State University is home to 17 academic departments, two centers and one residential college. These units span the humanities and the social, mathematical and natural sciences. CAS aims to develop a distinctive identity built upon our university's strengths, traditions and locations. The college’s values lie not only in service to the university and local community, but through inspiring, training, educating and sustaining the development of its students as global citizens. More than 6,800 student majors are enrolled in the college. As the college is also largely responsible for implementing App State’s general education curriculum, it is heavily involved in the education of all students at the university, including those pursuing majors in other colleges. Learn more at https://cas.appstate.edu.

About Appalachian State University

As a premier public institution, Appalachian State University prepares students to lead purposeful lives. App State is one of 17 campuses in the University of North Carolina System, with a national reputation for innovative teaching and opening access to a high-quality, affordable education for all. The university enrolls more than 21,000 students, has a low student-to-faculty ratio and offers more than 150 undergraduate and 80 graduate majors at its Boone and Hickory campuses and through App State Online. Learn more at https://www.appstate.edu.

“Astronomers are very interested in questions of origins — not only how stars form but also how planets form, because the two happen at the same time. I think it’s fair to say that probably 90% of what we know about objects in the universe comes through spectroscopy.”

Dr. Richard Gray, astronomer and professor emeritus in App State’s Department of Physics and Astronomy

View larger image

Dr. Richard Gray, professor emeritus in App State’s Department of Physics and Astronomy. Photo by Chase Reynolds

About Dr. Richard Gray

Dr. Richard Gray will retire from App State this summer, after 34 years of service in the Department of Physics and Astronomy. He has taught courses in environmental and computational physics, thermal physics, techniques of astronomical spectroscopy, astrophysics, planets and exoplanets and computational astronomy. He served on four students’ Honors College thesis committees between 2014 and 2017.

His research is in the field of stellar spectroscopy, with interests that include the discovery and classification of chemically peculiar stars, Lambda Bootis stars in particular, which is a group of stars that show marked low abundance, or unusually low abundance of iron peak elements in their surface layers. In addition to his research on Lambda Bootis stars, Gray monitors a set of young solar analogs (YSAs) in an effort to learn more about the space environment of the Earth when life was first forming nearly 4 billion years ago.

During his time at the university, Gray has designed and constructed four astronomical spectrographs, three of which are in use in telescopes in the Dark Sky Observatory and one that is used for the 16-inch telescope in the university’s Rankin Science Observatory.

He shared that he developed his first spectrograph around the age of 15.

“I got interested in astronomy when I was about 13 years old or so and then became really interested in spectroscopy. My parents gave me a little diffraction grating for my birthday, and I just thought that was so fantastic,” he said.

He is a member of the International Astronomical Union and American Astronomical Society, and is a fellow of the Royal Astronomical Society. He is also an international collaborator on the LAMOST-Kepler project, which is obtaining spectra of tens of thousands of stars using the Chinese LAMOST spectroscopic telescope in the Kepler field.

Gray holds a B.A. in mathematics from Washington State University and earned both his M.S. and Ph.D. in astronomy from the University of Toronto. He is an affiliated professor of the University of the Free State and has supervised the work of several UFS doctoral students studying astronomy.

App State Fulbright Scholar Program
App State Fulbright Scholar Program

The Fulbright Program is the flagship international educational exchange program sponsored by the U.S. government and was created to increase mutual understanding between the people of the United States and the people of other countries.

At App State, the program is administered through the Office of International Education and Development (OIED) and Office of Research.

Learn more
2019–20 Fulbright awardee Dr. Richard Gray to ‘unite the sky’ through astronomical partnership with South Africa’s UFS
2019–20 Fulbright awardee Dr. Richard Gray to ‘unite the sky’ through astronomical partnership with South Africa’s UFS
Nov. 1, 2019

During the 2019–20 academic year, Appalachian astronomy professor Dr. Richard Gray will teach and perform research at the University of the Free State in South Africa as part of his Fulbright award.

Read the story
$500K grant funds mountain-to-mountain collaboration between App State and South Africa’s UFS
$500K grant funds mountain-to-mountain collaboration between App State and South Africa’s UFS
Oct. 27, 2020

App State and South Africa’s University of the Free State (UFS) will strengthen their existing partnership through a two-year mountain-to-mountain project that has received $500,000 in grant support. Read more about the project, which will engage faculty, staff and graduate students at both institutions.

Read the story
App State honored as a Top Producer of Fulbright scholars, students for 2022–23
App State honored as a Top Producer of Fulbright scholars, students for 2022–23

The university is one of 3 master’s institutions nationwide to receive the honor

Feb. 15, 2023

App State has been named a Top Producer of Fulbright students and scholars for 2022–23, with two faculty and four alumni receiving a Fulbright to teach, perform research and/or study abroad. This marks the third time the university has received this honor in the past four academic years.

Read the story
Dark Sky Observatory
Dark Sky Observatory

Established in 1981, App State's Dark Sky Observatory (DSO) is the research facility used by faculty and their students to conduct observational research in astrophysics. It is equipped with four telescopes, each used regularly for CCD imaging and photometry, with spectrographic instrumentation also used at the 32-inch.

Learn more

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Appalachian Today is an online publication of Appalachian State University. This website consolidates university news, feature stories, events, photo galleries, videos and podcasts.

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Appalachian Today is an online publication of Appalachian State University. This website consolidates university news, feature stories, events, photo galleries, videos and podcasts.

If you cannot find what you're looking for here, please refer to the following sources:

  • Podcasts may be found at Appalachian State University Podcasts
  • Stories and press releases published prior to Jan. 1, 2015 may be found in University Communications Records at the Special Collections Research Center.
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