M 31-RV evolution and its alleged multi-outburst pattern
M 31-RV evolution and its alleged multi-outburst pattern
复制标题
DOI：
10.1051/0004-6361:20035716
复制
发表时间：
2004-02
影响因子：
6.5
通讯作者：
F. Boschi;U. Munari
中科院分区：
文献类型：
--
作者：
F. Boschi;U. Munari
用Asiago望远镜在半个多世纪以来获得的1447个仙女座星系盘上研究了M 31-RV的光度演化。M 31-RV是1988年发生在M 31凸出部的一次巨大的恒星爆炸，其特征是在几个月内出现了一颗M超巨星，达到Mbol = −10。1988年的爆发在阿西阿古板块上被探测到，并且是在板块覆盖期间（1942 - 1993）唯一记录到的此类事件。特别是，1967年的一次爆发被更多更深的Asiago板块排除在外，这对这一独特事件的解释模型具有相关意义。我们概述了光谱和光度演化与2002年在我们银河系爆炸的V838 Mon的相似之处。这种类比也被发现延伸到了M31-RV和V838 Mon在光球温度突然下降时所表现出的非常相似的绝对星等。尽管两个天体的金属丰度、年龄和质量有很大差异，但这些相似之处表明，在这两种情况下，都有相同的、普遍的、尚未确定的过程在起作用。
The photometric evolution of M 31-RV has been investigated on 1447 plates of the Andromeda galaxy obtained over half a century with the Asiago telescopes. M 31-RV is a gigantic stellar explosion that occurred during 1988 in the Bulge of M 31 and that was characterized by the appearance for a few months of an M supergiant reaching Mbol = −10. The 1988 outburst has been positively detected on Asiago plates, and it has been the only such event recorded over the period covered by the plates (1942−1993). In particular, an alleged previous outburst in 1967 is excluded by the more numerous and deeper Asiago plates, with relevant implication for the interpretative models of this unique event. We outline a close analogy in spectral and photometric evolution with those of V838 Mon which exploded in our Galaxy in 2002. The analogy is found to extend also to the closely similar absolute magnitude at the time of the sudden drop in photospheric temperature that both M 31-RV and V838 Mon exhibited. These similarities, in spite of the greatly differing metallicity, age and mass of the two objects, suggest that the same, universal and not yet identified process was at work in both cases.