Article
Radial Velocities of Galactic O-type Sars. II. Single-Lined Spectroscopic Binaries
The Astronomical Journal
(2012)
Abstract
We report on new radial velocity measurements of massive stars that are either suspected binaries or lacking prior observations. This is part of a survey to identify and characterize spectroscopic binaries among O-type stars with the goal of comparing the binary fraction of field and runaway stars with those in clusters and associations. We present orbits for HDE 308813, HD 152147, HD 164536, BD−16◦4826, and HDE 229232, Galactic O-type stars exhibiting single-lined spectroscopic variation. By fitting model spectra to our observed spectra, we obtain estimates for effective temperature, surface gravity, and rotational velocity. We compute orbital periods and velocity semiamplitudes for each system and note the lack of photometric variation for any system. These binaries probably appear single-lined because the companions are faint and because their orbital Doppler shifts are small compared to the width of the rotationally broadened lines of the primary.
Keywords
- binaries: spectroscopic,
- stars: early-type,
- stars: fundamental parameters
Disciplines
Publication Date
December 17, 2012
DOI
10.1088/0004-6256/145/2/29
Citation Information
S. J. Williams, D. R. Gies, Todd Hillwig, M. V. McSwain, et al.. "Radial Velocities of Galactic O-type Sars. II. Single-Lined Spectroscopic Binaries" The Astronomical Journal Vol. 145 (2012) p. 29 Available at: http://works.bepress.com/todd_hillwig/10/