Peculiar Red Nova V838 Mon: Accretion and Interaction in a Wide Binary System after Explosion of Its Companion

Vitaly Goranskij; Alla Zharova; Elena Barsukova; Sergei Fabrika; Azamat Valeev

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arXiv · 0810.1887

Peculiar Red Nova V838 Mon: Accretion and Interaction in a Wide Binary System after Explosion of Its Companion

Vitaly Goranskij·Alla Zharova·Elena Barsukova·Sergei Fabrika·Azamat Valeev

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Abstract

We report the results of recent multicolor photometry and medium resolution spectroscopy of V838 Mon taken in 2007-2008. In the eclipse-like event in December 2006, the hot B3V type companion disappeared. The event accompanied by strengthening emission [FeII]/FeII lines in the spectra. We explain this event as the formation of temporal short-lived accretion disc around the hot companion. Later, in February 2007 the hot star reappeared in its full brightness, but disappeared again for a long time since September 2007. This is the engulf of B3V companion by expanding remnant of 2002 outburst. We assume that the thick accretion disc has formed around B type companion which is moving now inside the envelope of the cool star. There is some evidence of heating this disc and/or cool star envelope. We estimated the radius of expanding cool remnant in December, 2006 of about 150 A.U. or 30000 solar radii.

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Vitaly Goranskij, Alla Zharova, Elena Barsukova, Sergei Fabrika, Azamat Valeev. 2008-10-10. Peculiar Red Nova V838 Mon: Accretion and Interaction in a Wide Binary System after Explosion of Its Companion. https://arxiv.org/abs/0810.1887

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