A cloudy circumstellar dust shell around SV Cephei

Details A cloudy circumstellar dust shell around SV Cephei A cloudy circumstellar dust shell around SV Cephei

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...255..246f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 255, no. 1-2, p. 246-254.

Astronomy and Astrophysics

Astronomy

19

Cepheid Variables, Color-Magnitude Diagram, Interstellar Extinction, Stellar Envelopes, Astronomical Models, Astronomical Photometry, Emission Spectra, Infrared Astronomy, Spectral Bands

Scientific paper

SV Cephei is an evolutionarily young and irregularily variable star coinciding with the infrared point source IRAS 22205+7325. An analysis of the photometric data revealed four components of different time scales and amplitudes in the lightcurve. We explain this composite variability by a circumstellar dust envelope which consists of a large number of individual clouds. A detailed analysis of selected fadings of the star convincingly points to at least three different grain populations in these clouds. The observed infrared excess supports the circumstellar origin of the optical variability.

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