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Astron. Astrophys. 347, 937-941 (1999)

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A dense gas-dust cloud near the A-e star DD Serpentis

A.F. Pugach and G.U. Kovalchuk

Main Astronomical Observatory of the National Academy of Sciences of Ukraine, 252650 Kyiv, Golosiiv, Ukraine (pugach, koval@mao.kiev.ua)

Received 7 August 1997 / Accepted 1 February 1999

Abstract

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[FORMULA]-line with equivalent width of emission component EW H[FORMULA]0.5 Å. In 1991 a drastic H[FORMULA]-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

Send offprint requests to: A.F. Pugach (pugach@mao.kiev.ua)

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© European Southern Observatory (ESO) 1999

Online publication: June 6, 1999
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