Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...101...96p&link_type=abstract
Astronomy and Astrophysics, vol. 101, no. 1, Aug. 1981, p. 96-100. In French.
Astronomy and Astrophysics
Astrophysics
2
B Stars, H Alpha Line, H Beta Line, Stellar Envelopes, Stellar Spectra, Balmer Series, Discontinuity, Emission Spectra, Stellar Magnitude
Scientific paper
The contribution of the stellar envelope to variations of transitory-type Be stars, which are alternately of types B and Be, is investigated. The Rojas-Herman classification is applied to the quantification of long-term stellar variation for a sample of Be stars brighter than magnitude 7, and compared with the spectral properties of these stars. A relation is derived between the equivalent widths of the H-alpha and H-beta lines and the stellar U-B index. The U-B index is then calibrated as a function of the Balmer discontinuity in order to separate the contributions of the star and its envelope to the emission. The separate U-B indices derived for the star, which are characterized by long-term variations, and the envelope, which is sensitive to short-term variations, are observed to be additive, implying that the observed flux is a convolution of the fluxes emitted by the star and its envelope.
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