Variations in the shell spectrum of the Be star EW Lacertae

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Stars: Be - Spectral Features

Scientific paper

Between 1982 and 1984 we carried out spectral observations of EW Lac with a grating spectrograph on the 60/90 cm Schmidt telescope of Beijing Observatory. We found that 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. We measured the radial velocity of the Balmer lines and did not find any obvious Balmer progression, while the radial velocity of the double core, particularly the V component, showed clear variations in time. We think the variations reflect ejection of shell matter.

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