Stellar winds in Cygnus OB2 (VI Cygni)
Abstract
Spectroscopic measurements of 25 OB stars in the Cygnus OB2 (VI Cyg) association are discussed in relation to the mass loss phenomena suggested by X-ray and radio observations. Spectrographs were obtained at dispersions of 78 and 35 A/mm for features of wavelengths greater than 3950 A, and radial velocities of all line features were measured in order to investigate the velocity-excitation correlation. The H-R diagram shows the Cyg OB2 stars to be much less evolved than other Galactic and Magellanic Cloud stars, a finding which is probably connected with a lack of observed mass-loss characteristics. Several possible binaries are noted, although the lack of strong X-ray sources in the field suggests that no binaries have evolved to the stage of classical X-ray binaries.
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- February 1981
- DOI:
- 10.1086/130774
- Bibcode:
- 1981PASP...93...50H
- Keywords:
-
- B Stars;
- Cygnus Constellation;
- O Stars;
- Stellar Mass Ejection;
- Stellar Winds;
- X Ray Sources;
- Binary Stars;
- Hertzsprung-Russell Diagram;
- Radial Velocity;
- X Ray Binaries;
- Astronomy