Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...222..200b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 222, no. 1-2, Sept. 1989, p. 200-204.
Astronomy and Astrophysics
Astrophysics
32
B Stars, Dwarf Stars, Early Stars, Giant Stars, Stellar Spectra, Reviewing, Stellar Atmospheres, Stellar Models, Stellar Oscillations, Stellar Rotation
Scientific paper
The null result of a search for intrinsic line profile variability (LPV) in a sample of 22 late B type stars is discussed. The non-detection contrasts sharply with observations at both lower and higher Teff where LPV appears to be widespread among the delta Scuti stars and characterizes the majority of O to mid-B stars, respectively. Various models for the stationary, nearly central quasi-emission bumps in the rotationally broadened lines of some stars which have so far remained basically unexplained are explored. It is suggested that such line profiles are due to the change in effective gravity from equator to poles and the associated temperature differences in rapidly rotating stars.
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