Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984afz....20..447z&link_type=abstract
(Astrofizika, vol. 20, May-June 1984, p. 447-463) Astrophysics (ISSN 0571-7132), vol. 20, no. 3, Nov. 1984, p. 239-249. Translat
Astronomy and Astrophysics
Astrophysics
15
Astronomical Photometry, Irregular Variable Stars, Stellar Envelopes, Stellar Luminosity, Variable Stars, Cosmic Dust, Interstellar Extinction, Spectral Energy Distribution, Thermal Emission, Ubv Spectra
Scientific paper
Results are presented of photoelectric measurements of light of the fast irregular variable WW Vul made during 1967-1982 in the UBV system. It is established that the fadings in the light of the star have a duration in the million to ten million sec range, with the depth reaching 2.2 m in V. These fadings can be explained by scattering and absorption of light in an inhomogeneous dust envelope consisting of silicate particles of mean radius 0.16 micron and a total number of 10 to the 36th-37th. Under the assumption that the grains are heated to 800-1000 K, the observed radiation excess of WW Vul in the range 1.65-3.4 microns can be explained. It is argued that there is heated gas in the envelope of WW Vul, whose radiation is superimposed on the emission from the star.
Chugainov P. F.
Zaitseva G. V.
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