Other
Scientific paper
Feb 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pasp...93...50h&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 93, Feb.-Mar. 1981, p. 50-54.
Other
19
B Stars, Cygnus Constellation, O Stars, Stellar Mass Ejection, Stellar Winds, X Ray Sources, Binary Stars, Hertzsprung-Russell Diagram, Radial Velocity, X Ray Binaries
Scientific paper
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.
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