Evolution of Red Nova V4332 Sagittarii Remnant

Barsukova, E.A.; Goranskij, V.P.; Valeev, A.F.; Zharova, A.V.

Авторы: Barsukova E.A., Goranskij V.P., Valeev A.F., Zharova A.V.
Журнал: Astrophysical Bulletin
Том: 69
Номер: 1
Год издания: 2014
Первая страница: 67
Последняя страница: 81
DOI: 10.1134/S1990341314010076
Аннотация: We present the multicolor BVRI photometry and the intermediate-resolution spectroscopy with the Russian 6-m BTA telescope and the SCORPIO focal reducer performed for the red nova V4332 Sgr in 2005 – 2012. We analyzed the behavior of the nova remnant considering our observations together with all the published observations and archival photographic photometry. The atomic and molecular emission nebular spectra show exponential weakening. Since 2003, line fluxes decreased on average by 30 times. The continuum of M-giant in the spectrum weakened abruptly between 2006 and 2008 by 2 times in the red range and by 4 times in the blue one. Changes in the spectral energy distribution of the stellar continuum agree with a decrease in the surface temperature of the M-giant by 1000 K. The presence of a weak ~20 mag star is possible. The star can be either a member of the system or a field star. It is found that the phenomenon of the red nova in this system is not bound up with the M type star. The precursor of the explosion could be a blue straggler which disappeared from the spectral energy distribution after the explosion in 1994. It is most likely that this object was a contact binary system. For an explanation of the "cold explosion” of V4332 Sgr, we have accepted the hypothesis of merging components of contact binary star in a hierarchical triple or multiple system. There are evidences of dynamical destruction of the outburst remnant and accretion from it to the M giant. The cause of the phenomenon of a red nova is found to be a sudden explosive energy release in the center of a star having a massive envelope, and the subsequent expansion of the envelope in a regime close to adiabatic. As a result of the explosion, heat energy reaches the surface of the envelope for a year or a few years after the outburst in the time when the envelope has large area. The cause of the explosion in the center of a star can be both merger event of the nuclei of two stars in a contact system which have formed a massive common envelope, and instability in the core of a young single massive star. Thus, red novae can be heterogeneous objects in different evolutionary stages.
Добавил в систему: Горанский Виталий Петрович

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Evolution of Red Nova V4332 Sagittarii Remnantстатья

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