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arXiv 1303.1980astro-ph.SR
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关于M31新星始祖群

On the M31 Nova Progenitor Population

S. C. Williams, M. J. Darnley, M. F. Bode, A. W. Shafter

摘要:

本文介绍了静止期M31新星的概况。这是第一个静止的河外星系目录,包含2006年至2013年期间37颗光谱确认的新星。我们使用利物浦望远镜和福克斯望远镜在爆发期间拍摄的北图像来确定每个系统的准确位置。然后将这些位置转换为存档的哈勃太空望远镜(HST)图像,我们对任何与转换位置一致的可分辨源进行测光。由于M31中的红巨星在HST图像中是可以分辨的,我们可以检测到红巨星秒的系统。在我们的银河系中,只有少数几个这样的系统被证实(例如RS Oph和T CrB)。然而,我们发现在M31中有更高比例的新星可能包含红巨星二等星。对于一些新星,当新星还在褪色时,就已经拍摄了符合的HST图像,这使我们能够产生比大多数河外星系可能达到的更暗的光变曲线。最后,我们比较了M31和银河系的静止新星种群。

英文摘要:

We present a survey of M31 novae in quiescence. This is the first catalogue of extragalactic systems in quiescence and contains 37 spectroscopically confirmed novae from 2006 to 2013. We used Liverpool Telescope and Faulkes Telescope North images taken during outburst to identify accurate positions for each system. These positions were then transformed to archival Hubble Space Telescope (HST) images and we performed photometry on any resolvable source that was consistent with the transformed positions. As red giants in M31 will be resolvable in the HST images, we can detect systems with red giant secondaries. There are only a few confirmed examples of such systems in our Galaxy (e.g. RS Oph and T CrB). However, we find a much higher portion of the nova population in M31 may contain red giant secondaries. For some novae, coincident HST images had been taken when the nova was still fading, allowing us to produce light curves that go fainter than is possible to achieve for most extragalactic systems. Finally, we compare the M31 and Galactic quiescent nova populations.

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