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arXiv 1302.6285astro-ph.GAastro-ph.SR
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大麦云星云中新星的光度和光谱特性

Photometric and Spectroscopic Properties of Novae in the Large Magellanic Cloud

A. W. Shafter

摘要:

本文总结和评述了43颗已知LMC新星候选者的光度和光谱性质。其中,光度数据足以建立下降率可用于29新星,而光谱数据足以建立光谱类可用于18个系统。18颗新星中有一半属于Fe II类,其余9颗属于He/N或Fe IIb类。在之前对M31和M33的研究中发现,He/N和Fe IIb型新星的光度发展平均比Fe II型新星快。总的来说,现有的测光证实了早期的研究,并最终表明,LMC新星有更快的下降速度比银河系和M31的新星。与M31相比,在大麦哲伦星系中观测到的更快的He/N和Fe IIb新星的比例增加,几乎可以肯定是两个星系之间潜在的恒星星族差异的结果。我们认为,与M31的隆起(大部分新星都在那里发现)相比,大麦哲伦星云中的年轻人口产生了平均质量更高的白矮星双星。与M31相比,较高的平均白矮星质量不仅产生了更大比例的快速He/N新星,而且还导致了相对较大的复发新星人口。

英文摘要:

The photometric and spectroscopic properties of the 43 known LMC nova candidates are summarized and reviewed. Of these, photometric data sufficient to establish decline rates are available for 29 novae, while spectroscopic data sufficient to establish the spectroscopic classes are available for 18 systems. Half of the 18 novae belong to the Fe II class, with the remaining nine belonging to either the He/N or the Fe IIb classes. As seen in previous nova studies of M31 and M33, the He/N and Fe IIb novae have on average faster photometric developments than do their Fe II counterparts. Overall, the available photometry confirms earlier studies, and shows conclusively that LMC novae have faster rates of decline than do novae in the Galaxy and M31. It appears that the increased fraction of faster, He/N and Fe IIb novae observed in the LMC compared with M31 is almost certainly the result of differences in the underlying stellar population between the two galaxies. We propose that the younger population seen in the LMC compared with M31's bulge (where most of the novae are found) produces progenitor binaries with higher average white dwarf masses. The higher mean white dwarf mass not only produces a larger fraction of fast, He/N novae compared with M31, but also results in a relatively large recurrent nova population.

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