NEW PRECISION ORBITS OF BRIGHT DOUBLE-LINED SPECTROSCOPIC BINARIES. III. HD 82191, ω DRACONIS, AND 108 HERCULIS
- 6 March 2009
- journal article
- Published by American Astronomical Society in The Astronomical Journal
- Vol. 137 (4), 3900-3910
- https://doi.org/10.1088/0004-6256/137/4/3900
Abstract
We have determined improved spectroscopic orbits for three double-lined binaries, HD 82191 (Am), ω Dra (F5 V), and 108 Her (Am), using radial velocities from the 2.1 m telescope at McDonald Observatory, the coudé feed telescope at Kitt Peak National Observatory, and 2 m telescope at Fairborn Observatory. The orbital periods range from 5.28 to 9.01 days, and all three systems have circular orbits. The new orbital dimensions (a 1 sin i and a 2 sin i) and minimum masses (m 1 sin3 i and m 2 sin3 i) have accuracies of 0.2% or better. Our improved results confirm the large minimum masses of HD 82191 and also agree with the values previously found for ω Dra. However, for the components of 108 Her our minimum masses are about 20% larger than the previous best values. We conclude that both components of HD 82191 as well as the primary of 108 Her are Am stars. However, the A9 secondary of 108 Her has normal abundances. We estimate spectral types of F4 dwarf and G0 dwarf for the components of ω Dra. The primaries of the three binaries are synchronously rotating as is the secondary of 108 Her. The secondaries of HD 82191 and ω Dra are possibly synchronously rotating.Keywords
This publication has 36 references indexed in Scilit:
- A Physical Orbit for the High Proper Motion Binary HD 9939The Astrophysical Journal, 2006
- Spectral Classification of Stars in A Supplement to the Bright Star CatalogueThe Astrophysical Journal Supplement Series, 2004
- Abundance analysis of two late A-type stars HD 32115 and HD 37594Astronomy & Astrophysics, 2002
- The Relation between Rotational Velocities and Spectral Peculiarities among A-Type StarsThe Astrophysical Journal Supplement Series, 1995
- Improved study of metallic-line binariesThe Astrophysical Journal Supplement Series, 1985
- A study of short-period RS Canum Venaticorum and W Ursae Majoris binary systems - The global nature of H-alphaThe Astrophysical Journal, 1985
- Multiplicity among solar-type starsThe Astrophysical Journal Supplement Series, 1976
- Rotational velocities of marginal metallic-line stars.The Astrophysical Journal, 1975
- Spectral Classification of A-Type Spectroscopic BinariesThe Astrophysical Journal, 1969
- The three-prism stellar spectrograph of the Mount Wilson Solar Observatory.The Astrophysical Journal, 1912