UBVJHKLM photometry of the symbiotic Mira V407 Cyg in 1998-2002

Kolotilov, E.A.; Shenavrin, V.I.; Shugarov, S.Y.; Yudin, B.F.

Авторы: Kolotilov E.A., Shenavrin V.I., Shugarov S.Yu, Yudin B.F.
Журнал: Astronomy Reports
Том: 47
Номер: 9
Год издания: 2003
Издательство: Pleiades Publishing, Inc.
Местоположение издательства: New York, USA
Первая страница: 777
Последняя страница: 788
DOI: 10.1134/1.1611218
Аннотация: New results of UBV JHKLM photometry of the symbiotic Mira V407 Cyg performed in 1998 2002 are reported. In 2002, these observations were supplemented with RI observations and a search for rapid variability in the V band. The hot component of V407 Cyg experienced a strong flare in 1998, which was the second in the history of photometric observations of this star; this flare is still continuing. During the flare, the spectral energy distribution of the hot component can be approximated by blackbody radiation with a temperature of ˜7200 K. At the maximum brightness, the bolometric flux from the hot component did not exceed 3% of the Mira's mean bolometric flux, while its bolometric luminosity was ˜400Lsun. Appreciable variations of the star's BV brightness on a timescale of several days have been observed. These variations are not correlated with variations of B-V. Flickering on a timescale of several minutes with an amplitude of has been detected in the V band. The observations suggest that the hot component can be in three qualitatively different states. In a model with a rapidly rotating white dwarf, these states can be associated with (i) the quiescent state of the white dwarf (with a very low accretion rate), (ii) an ejection state, and (iii) an accretion state. The Mira pulsation period P is ≈ 762 mathop with its infrared maximum occurring ˜0.15P after the visual maximum. A “step” is observed on the ascending branch of the Mira infrared light curves. In 1998, the gradual increase of the mean K brightness of the Mira that had been observed since 1984 was interrupted by an unusually deep minimum, after which the mean level of the K brightness considerably decreased.
Добавил в систему: Шенаврин Виктор Иванович

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UBVJHKLM photometry of the symbiotic Mira V407 Cyg in 1998-2002статья

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