A search for line profile variability in dwarfs and giants of spectral types B8-B9.5. I - Observations and measurements

Details A search for line profile variability in dwarfs and giants of spectral types B8-B9.5. I - Observations and measurements A search for line profile variability in dwarfs and giants of spectral types B8-B9.5. I - Observations and measurements

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26as...79..423b&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 79, no. 3, Sept. 1989, p. 423-441.

Astronomy and Astrophysics

Astrophysics

20

B Stars, Dwarf Stars, Giant Stars, Line Shape, Stellar Spectra, Emission Spectra, Line Spectra, Stellar Atmospheres, Stellar Oscillations, Stellar Rotation

Scientific paper

Fifty-six high-resolution spectra, mostly showing He I 447.1 and Mg II 448.1 lines, have been obtained at different epochs for 22 stars of spectral types B8-B9.5 and luminosity classes III-V. Of these objects, 15 are more or less normal, four are known emission-line stars, one is an Hg-Mn star, one is He-weak, and one may or may not be another Be star. In none of the subcategories, line profile variability was detected. A mean upper limit to any profile modulation (1 sigma rms) of the Mg II 448.1 line is 3.5 percent of the line depth. This figure still includes the high-frequency noise. Radial velocities and improved estimates of the projected rotation velocity on the scale of Slettebak, et al. (1975) are provided for all stars of the sample. In two stars, stationary nearly central quasi-emission bumps were detected which had previously been seen in only one or two other stars.

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