Spectroscopic studies of O-type stars. VIII - Radial velocities and the K-term

Details Spectroscopic studies of O-type stars. VIII - Radial velocities and the K-term Spectroscopic studies of O-type stars. VIII - Radial velocities and the K-term

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...214..759c&link_type=abstract

Astrophysical Journal, Part 1, vol. 214, June 15, 1977, p. 759-772. Research supported by the Nederlandse Organisatie voor Zuiv

Astronomy and Astrophysics

Astrophysics

176

Binary Stars, Early Stars, O Stars, Radial Velocity, Red Shift, Stellar Mass Ejection, Computer Techniques, Line Spectra, Statistical Analysis, Stellar Motions, Stellar Spectra, Tables (Data)

Scientific paper

Radial velocities are measured on coude spectrograms of over 200 O-type stars in both hemispheres. The selection of effective wavelengths for the stellar lines to be measured is reviewed, and the measured velocities are compared with those available in a catalog of O stars. The Trumpler (1935) effect (a reported anomalous redshift in certain O stars) is inconclusively reinvestigated, atmospheric motions in Of stars are examined, and some kinematic properties of O stars are discussed statistically. It is found that 58% of all O stars and 41% of all the Of stars considered are certain or probable binaries. A K-term in the range from 1 to 2 km/s is derived for the O stars, but the Of stars are shown to have a highly significant negative K-term. It is suggested that the systematically negative peculiar velocities of the Of stars are due to outflow of material beginning at the photospheric level.

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