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A dense gas-dust cloud near the A-e star DD Serpentis
A.F. Pugach and
Received 7 August 1997 / Accepted 1 February 1999
We present results of the medium resolution spectral observations of a variable A-e star DD Ser. In 1984-1986 the star was found to have a normal double emission H-line with equivalent width of emission component EW H0.5 Å. In 1991 a drastic H-line profile, as well as photometric variations, were detected. Analysis of the reconstructed profile of the emission line absorption component implies that a dense gas-dust cloud has most likely emerged on the line of sight at the moment of the spectral observations. Quantitative characteristics of the absorption profile variation are given.
Key words: stars: circumstellar matter stars: emission-line, Be stars: individual: DD Ser stars: pre-main sequence
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Online publication: June 6, 1999