Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986azh....63..298k&link_type=abstract
(Astronomicheskii Zhurnal, vol. 63, Mar.-Apr. 1986, p. 298-309) Soviet Astronomy (ISSN 0038-5301), vol. 30, Mar.-Apr. 1986, p. 1
Astronomy and Astrophysics
Astronomy
3
Electrophotometry, Orion Constellation, Stellar Evolution, Stellar Spectrophotometry, Ubv Spectra, Variable Stars, Main Sequence Stars, Stellar Color, Stellar Envelopes, Stellar Luminosity, Stellar Magnitude, Visible Spectrum
Scientific paper
The pre-main-sequence variable star YY Ori was observed in 1979 - 1984 photoelectrically in the UBV system. The dependences of U, B magnitudes and (U-B) and (B-V) colors upon V brightness supplemented by the data of other authors are analysed; the following correlations are found: ΔU = (1.08±0.09)ΔV and ΔB = (1.06±0.04)ΔV. A permanent existence of UV and blue excess radiation follows from the location of YY Ori on the (U-B)-(B-V) diagram. The distribution of the photographic brightness of the star based on observations over 233 nights shows a significant asymmetry. It is suggested that the optical variability of YY Ori is caused by flares associated with the accretion from the circumstellar gas envelope and by the existence of a dust envelope (R ≈ 15), which also contains a number of large massive condensations.
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