The Cloudy Circumstellar Dust Shell of Ww-Vulpeculae Revisited

Details The Cloudy Circumstellar Dust Shell of Ww-Vulpeculae Revisited The Cloudy Circumstellar Dust Shell of Ww-Vulpeculae Revisited

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...277..184f&link_type=abstract

Astronomy and Astrophysics, Vol. 277, NO. 1/SEP(III), P. 184, 1993

Astronomy and Astrophysics

Astrophysics

28

Stars: Individual: Ww Vulpeculae - Stars: Emission Lines - (Stars:) Circumstellar Matter - (Ism:) Dust, Extinction - Infrared: Stars

Scientific paper

WW Vulpeculae is an evolutionarily young and irregular variable star coinciding with the infrared point source IRAS 19238+2106. The most conspicuous features of the lightcurve are the aperiodically occurring Algol-like minima with amplitudes up to 1.5 mag. Relevant UBVR data show that these minima originate from individual dust clouds moving in a circumstellar dust shell. The photometric data indicate different optical properties of the grain populations in these dust clouds. The reddening parameter 1? = AV/E(B - V) has been found to vary in the range from 3.5 to 7 for the individual clouds observed. The observed infrared excess supports the circumstellar origin of the optical variability.

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