Spectroscopic survey of galactic O and WN stars. OWN Survey: new binaries and trapezium-like systems
Abstract
High-angular resolution imaging, speckle, optical or near-infrared interferometric techniques have been used to determine the visual orbits of many nearby bright massive stars. Moreover, the combination of visual orbits and radial-velocity (RV) curves provides a method to derive the true orbit of the system, and hence, masses for each stellar component. The possibility to combine visual/spectroscopic orbits leads to the exploration of wider systems with longer periods (months to years time-scale). We are conducting a spectroscopic monitoring survey of about 240 southern galactic O and WN stars (OWN Survey). More than one hundred stars show RV variations larger than 10 km s^{-1}, allowing us to discover 26 new spectroscopic binaries. One of our goals is to derive RVs with errors lower than 1 km s^{-1}. One of the more remarkable discoveries of the survey is the multiple nature of the O-type system Herschel 36.
- Publication:
-
Revista Mexicana de Astronomia y Astrofisica Conference Series
- Pub Date:
- February 2010
- Bibcode:
- 2010RMxAC..38...30B
- Keywords:
-
- binaries: general;
- binaries: spectroscopic;
- stars: early-type;
- stars: Wolf-Rayet;
- techniques: high-angular resolution;
- techniques: radial velocities