Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Peculiar Red Nova V838 Mon: Accretion and Interaction in a Wide Binary
  System after Explosion of Its Companion   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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The categories of this paper are: funct-an
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: acc-phys
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The categories of this paper are: q-fin
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-th
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The categories of this paper are: gr-qc
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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-ex
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The categories of this paper are: econ
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The categories of this paper are: plasm-ph