Variations in the shell spectrum of the Be star EW Lacertae

Details Variations in the shell spectrum of the Be star EW Lacertae Variations in the shell spectrum of the Be star EW Lacertae

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987acaps...7...37g&link_type=abstract

(Acta Astrophysica Sinica, vol. 7, no. 1, 1987, p. 37-43) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 11, June 198

Astronomy and Astrophysics

Astrophysics

B Stars, Periodic Variations, Spectral Energy Distribution, Stellar Envelopes, Absorption Spectra, Balmer Series, Line Spectra, Stellar Spectrophotometry

Scientific paper

Between 1982 and 1984, spectral observations of EW Lac were conducted with a grating spectrograph on the 60/90 cm Schmidt telescope of Beijing Observatory. Its Balmer shell absorption lines changed within a short time, from a single absorption core to a double absorption core, and later changed back to a single core. The radial velocity of the Balmer lines was measured, and no obvious Balmer progression was found, while the radial velocity of the double core, particularly the V component, showed clear variations in time. The variations reflect ejection of shell matter.

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