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ON THE SPECTROSCOPIC CLASSES OF NOVAE IN M33

机译:关于M33中新星的光谱分类

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We report the initial results from an ongoing multi-year spectroscopic survey of novae in M33. The survey resulted in the spectroscopic classification of six novae (M33N 2006-09a, 2007-09a, 2009-01a, 2010-10a, 2010-11a, and 2011-12a) and a determination of rates of decline (t 2 times) for four of them (2006-09a, 2007-09a, 2009-01a, and 2010-10a). When these data are combined with existing spectroscopic data for two additional M33 novae (2003-09a and 2008-02a), we find that five of the eight novae with available spectroscopic class appear to be members of either the He/N or Fe?IIb (hybrid) classes, with only two clear members of the Fe?II spectroscopic class. This initial finding is very different from what would be expected based on the results for M31 and the Galaxy where Fe?II novae dominate, and the He/N and Fe?IIb classes together make up only ~20% of the total. It is plausible that the increased fraction of He/N and Fe?IIb novae observed in M33 thus far may be the result of the younger stellar population that dominates this galaxy, which is expected to produce novae that harbor generally more massive white dwarfs than those typically associated with novae in M31 or the Milky Way.
机译:我们报告了正在进行的对M33中新星的多年光谱调查的初步结果。该调查对6个新星(M33N 2006-09a,2007-09a,2009-01a,2010-10a,2010-11a和2011-12a)进行了光谱分类,并确定了下降速率(t 2倍)其中四个(2006-09a,2007-09a,2009-01a和2010-10a)。当将这些数据与另外两个M33新星(2003-09a和2008-02a)的现有光谱数据相结合时,我们发现具有可用光谱级别的八个新星中有五个似乎是He / N或Fe?IIb的成员(混合)类,只有Fe?II光谱类的两个明确成员。最初的发现与根据M31和银河系中Fe?II新星占主导地位的结果所预期的结果有很大不同,He / N和Fe?IIb类仅占总数的约20%。到目前为止,在M33中观察到的He / N和Fe?IIb新星增加的部分可能是由占主导地位的星系中较年轻的恒星族造成的,这可能产生的新星通常比白矮星拥有更大的白矮星。通常与M31或银河系中的新星有关。

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