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

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

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...347..937p&link_type=abstract

Astronomy and Astrophysics, v.347, p.937-941 (1999)

Astronomy and Astrophysics

Astrophysics

Stars: Circumstellar Matter, Stars: Emission-Line, Be, Stars: Individual: Dd Ser, Stars: Pre-Main Sequence

Scientific paper

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 Hα -line with equivalent width of emission component EW Hα_ {e}=13.3+/-0.5 Ä. In 1991 a drastic Hα -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.

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