Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.134..317p&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 134, no. 2, June 1987, p. 317-327.
Astronomy and Astrophysics
Astrophysics
12
B Stars, Periodic Variations, Shell Stars, Stellar Envelopes, Stellar Spectrophotometry, Early Stars, Light Curve, Spectrum Analysis, Stellar Spectra
Scientific paper
A multifrequency analysis of the short-term photometric variations of the Be and shell star EW Lac is performed. Two data sets, almost thirty years apart, revealed similar frequency structures but significantly differ in amplitudes. The causes of variability are checked under various assumptions including spot(s) on the surface, an inhomogeneous or asymmetric envelope, tidal distortion, and the presence of a companion. The most plausible interpretation is, however, found in terms of nonradial pulsations. In particular, the problem of abrupt light changes is pointed out, an effect which is fully explained by multiperiodicity.
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