Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.185...79b&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 185, no. 1, Nov. 1991, p. 79-94. Research supported by FONDECYT.
Astronomy and Astrophysics
Astronomy
13
B Stars, H Alpha Line, Light Curve, Stellar Rotation, Stellar Spectrophotometry, Emission Spectra, Ubv Spectra, Ultraviolet Astronomy
Scientific paper
Fifteen Be, 5 Bn, and 1 B stars were monitored during 10 nights in March-April 1988 by means of photoelectric ubvy photometry. At least 80 percent of the Be stars were found variable. Tentative periods between 0.3 and 4.3 days were derived for 13 stars of this entire sample. In all cases, the stars are bluest when brightest. Variations in B0-B5e stars are, in average, of larger amplitude than in B5-B9e stars. Bn stars show, in general, variations of smaller amplitude than Be stars. These results are discussed in terms of the current models on short-term photometric variability. In addition, from the observed period distribution the existence of intrinsically slow Be rotators are deduced. The rotation of slightly displaced poles of a weak global dipolar magnetic field is proposed as being responsible for the rapid periodic light variations.
Barrera Luis H.
Mennickent Ronald E.
Vogt Nicolas
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