Notes on the radial velocities of 14 O stars and the emission lines in their spectra

Details Notes on the radial velocities of 14 O stars and the emission lines in their spectra Notes on the radial velocities of 14 O stars and the emission lines in their spectra

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...364..626u&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 364, Dec. 1, 1990, p. 626-636. Research supported by NSERC.

Physics

Optics

22

Emission Spectra, Line Spectra, O Stars, Radial Velocity, Stellar Spectra, Cassegrain Optics, Velocity Distribution, Velocity Measurement

Scientific paper

Radial-velocity observations of 10 Of stars of various subtypes and of four O stars are presented. Two of the stars appear to have a constant velocity, one is known to be a spectroscopic binary, three are suspected spectroscopic binaries, and eight show a variable velocity of small range. The sharp Of emission lines are stationary with respect to the atmospheric layer in which the absorption lines are formed in all of the Of stars except one peculiar Of star, HD 108, and two supergiants. It is inferred that the purely emission lines in the spectrum of HD 108 are formed in plasma contained in arcades of magnetically supported loops which are attached to the photosphere of the star. The purely absorption lines and the lines with P-Cygni-type profiles in the spectrum of HD 108 are formed in a wind which originates in the photosphere. It is argued that the average radial velocity of the purely emission lines of HD 108 represents the true line-of-sight component of the stellar motion.

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