OBSERVATIONS AND ORBITAL ANALYSIS OF THE GIANT WHITE DWARF BINARY SYSTEM HR 5692
| العنوان: | OBSERVATIONS AND ORBITAL ANALYSIS OF THE GIANT WHITE DWARF BINARY SYSTEM HR 5692 |
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| المؤلفون: | James Murrett, David W. Latham, W. B. Landsman, Guillermo Torres, Nathaniel Craig, Robert P. Stefanik |
| المصدر: | The Astronomical Journal. 141:144 |
| بيانات النشر: | American Astronomical Society, 2011. |
| سنة النشر: | 2011 |
| مصطلحات موضوعية: | Physics, Radial velocity, Stars, Space and Planetary Science, Primary (astronomy), Red giant, Astronomy, White dwarf, Astronomy and Astrophysics, Astrophysics, Binary system, Giant star, Stellar evolution |
| الوصف: | We report spectroscopic observations of the red giant star HR 5692, previously known to be a binary system both from other spectroscopic work and from deviations in the astrometric motion detected by the Hipparcos satellite. Earlier International Ultraviolet Explorer (IUE) observations had shown the presence of a hot white dwarf companion to the giant primary. We have combined our radial velocity observations with other existing measurements and with the Hipparcos intermediate astrometric data to determine a complete astrometric-spectroscopic orbital solution, providing the inclination angle for the first time. We also determine an improved parallax for the system of 10.12 ± 0.67 mas. We derive the physical properties of the primary, and with an estimate of its mass from stellar evolution models (1.84 ± 0.40 M ☉), we infer the mass of the white dwarf companion to be M WD = 0.59 ± 0.12 M ☉. An analysis of an IUE white dwarf spectrum, using our parallax, yields T eff = 30, 400 ± 780 K, log g = 8.25 ± 0.15, and a mass M WD = 0.79 ± 0.09 M ☉, in marginal agreement with the dynamical mass. |
| تدمد: | 1538-3881 0004-6256 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::02d243b2a1cfbac6bf21252dc3262cb0 https://doi.org/10.1088/0004-6256/141/5/144 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi...........02d243b2a1cfbac6bf21252dc3262cb0 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15383881 00046256 |
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