Radial Velocities of Galactic O-Type Stars. II. Single-lined Spectroscopic Binaries

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.

26 pages, 6 figures, accepted to AJ

References in corpus (9)

• A Grid of NLTE Line-Blanketed Model Atmospheres of Early B-type Stars
• The High Angular Resolution Multiplicity of Massive Stars
• Cross-Correlation and Maximum Likelihood Analysis: A New Approach to Combine Cross-Correlation Functions
• TASS Mark IV Photometric Survey of the Northern Sky
• An Updated Look at Binary Characteristics of Massive Stars in the Cygnus OB2 Association
• Adaptive Optics Photometry and Astrometry of Binary Stars. III. A Faint Companion Search of O-Star Systems
• The massive star binary fraction in young open clusters - III. IC 2944 and the Cen OB2 association
• The Projected Rotational Velocity Distribution of a Sample of OB stars from a Calibration based on Synthetic He I lines
• An XMM-Newton view of the young open cluster NGC 6231 -- I. The catalogue

Cited by in corpus (11)

• Southern Massive Stars at High Angular Resolution: Observational Campaign and Companion Detection
• The Galactic O-Star Spectroscopic Survey (GOSSS). II. Bright Southern Stars
• The Galactic O-Star Spectroscopic Survey (GOSSS). III. 142 additional O-type systems
• Identifying quiescent compact objects in massive Galactic single-lined spectroscopic binaries
• A search for Galactic runaway stars using Gaia Data Release 1 and Hipparcos proper motions
• MONOS: Multiplicity Of Northern O-type Spectroscopic systems. I. Project description and spectral classifications and visual multiplicity of previously known objects
• Astrophysical Insights into Radial Velocity Jitter from an Analysis of 600 Planet-search Stars
• MONOS.II. Orbit review and analysis for 35 single-lined spectroscopic binary systems and candidates
• Galactic Kinematics from a Sample of Young Massive Stars
• The IACOB project VIII. Searching for empirical signatures of binarity in fast-rotating O-type stars
• Dissecting the microphysics behind the metallicity-dependence of massive stars radii