A sun in the spectroscopic binary IM Pegasi, the guide star for the Gravity Probe B mission
Article
Article Title | A sun in the spectroscopic binary IM Pegasi, the guide star for the Gravity Probe B mission |
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ERA Journal ID | 1057 |
Article Category | Article |
Authors | Marsden, S. C. (Author), Berdyugina, S. V. (Author), Donati, J.-F. (Author), Eaton, J. A. (Author), Williamson, M. H. (Author), Ilyin, I. (Author), Fischer, D. A. (Author), Munoz, M. (Author), Isaacson, H. (Author), Ratner, M. I. (Author), Semel, M. (Author), Petit, P. (Author) and Carter, B. D. (Author) |
Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
Journal Citation | 634 (2), pp. L173-L176 |
Number of Pages | 4 |
Year | 2005 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-637X |
1538-4357 | |
Digital Object Identifier (DOI) | https://doi.org/10.1086/498941 |
Web Address (URL) | https://iopscience.iop.org/article/10.1086/498941 |
Abstract | We present the first detection of the secondary of the spectroscopic binary system IM Pegasi (HR 8703), the guide star for the NASA-Stanford relativity gyroscope mission Gravity Probe B. In support of this mission, high-resolution echelle spectra of IM Peg have been obtained on an almost nightly basis. Applying the technique of least-squares deconvolution, we achieve very high signal-to-noise ratio line profiles and detect the orbit of the secondary of the system. Combining almost 700 new radial velocity measurements of both the primary and secondary of the system with previous measurements, we derive improved orbital parameters of the IM Peg system. Using these estimates along with the previously determined range of orbital inclination angles for the system, we find that the primary of IM Peg is a giant of mass 1.8 +/- 0.2 M-circle dot while the secondary is a dwarf of mass 1.0 +/- 0.1 M-circle dot. |
Keywords | binaries; spectroscopic; stars; IM Pegasi |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | For access to this article, please click on the URL link provided. |
Byline Affiliations | Swiss Federal Institute of Technology, Switzerland |
Institute for Research in Astrophysics and Planetology, France | |
Tennessee State University, United States | |
Leibniz Institute for Astrophysics, Germany | |
San Francisco State University, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
Laboratory of Space Science and Astrophysical Instrumentation, France | |
Max Planck Society, Germany | |
Department of Biological and Physical Sciences |
https://research.usq.edu.au/item/9zv24/a-sun-in-the-spectroscopic-binary-im-pegasi-the-guide-star-for-the-gravity-probe-b-mission
1921
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