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arXiv 0810.1887astro-ph
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奇特的红新星V838 Mon:伴星爆炸后在宽双星系统中的吸积和相互作用

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

摘要:

我们报告了2007-2008年拍摄的V838 Mon的最新测光和中分辨率光谱的结果。在2006年12月的类食事件中,热的B3 V型伴星消失了。该事件伴随着加强发射[Fe Ⅱ]/Fe Ⅱ谱线。我们解释这一事件的形成时间短寿命的吸积盘周围的热同伴。后来,在2007年2月,这颗炽热的恒星以其全部亮度重新出现,但自2007年9月以来又消失了很长一段时间。这是B3 V伴星被2002年大爆发的膨胀残骸吞没。我们假设厚吸积盘已经在B型伴星周围形成,B型伴星现在正在冷恒星的包层内移动。有一些证据表明,这个盘和/或冷星信封加热。我们估计2006年12月冷残留物的扩张半径约为150 A.U.或30000太阳半径。

英文摘要:

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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