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arXiv 2404.04733astro-ph.SRastro-ph.GA
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探索M31中新星的MMRD关系

Exploring the MMRD Relation for Novae in M31

J. Grace Clark, Kamil Hornoch, Allen W. Shafter, Hana Kučáková, Jan Vraštil, Peter Kušnirák, Marek Wolf

AI总结:

基于M31新星二十年R波段测光数据,研究检验了MMRD关系和M_15标准烛光,发现二者弥散均较大、难以精确测距,并识别出约12颗疑似再发新星。

摘要:

本文介绍了对M31中新星开展的长达二十年的R波段测光巡天结果。根据这些数据,测定了180颗新星的R波段光变曲线,其数据足以估计峰值亮度及随后的衰减速率。数据表明,峰值亮度与衰减速率之间存在弱相关,这与著名的最大星等与衰减速率(Maximum Magnitude versus Rate of Decline,MMRD)关系相一致。正如人们对银河系新星的普遍认识,MMRD关系中的巨大弥散使其无法用于确定单颗新星的距离。处于最大亮度的新星围绕平均R波段绝对星等〈M_R〉=-7.57±0.07分布,标准差为σ=0.89 mag。M31新星的总体光度分布与银河系新星的观测结果高度一致,表明M31与银河系中的新星族群非常相似。本文还探讨了所有新星都可用最大亮度后15天的标准光度(M_15)来表征这一观点。令人惊讶的是,M_15值分布的标准差仅略小于新星在最大亮度时的标准差,因此其在精确测定河外距离方面几乎没有应用前景。此外,根据在MMRD图和M_15分布中的位置,识别出了十余颗暗弱且快速的新星,它们很可能是此前未被识别的再发新星。

英文摘要:

The results of a two decade long $R$-band photometric survey of novae in M31 are presented. From these data, $R$-band light curves have been determined for 180 novae with data sufficient for estimating peak brightness and subsequent rate of decline. The data show a weak correlation of peak brightness with fade rate consistent with the well-known Maximum Magnitude versus Rate of Decline (MMRD) relation. As generally appreciated for Galactic novae, the large scatter in the MMRD relation precludes its use in determining distances to individual novae. The novae at maximum light are distributed with standard deviation $σ=0.89$ mag about a mean $R$-band absolute magnitude given by $\langle M_R \rangle=-7.57\pm0.07$. The overall M31 luminosity distribution is in excellent agreement with that found for Galactic novae suggesting that the nova populations in M31 and the Galaxy are quite similar. The notion that all novae can be characterized by a standard luminosity 15 d after maximum light ($M_{15}$) is also explored. Surprisingly, the distribution of $M_{15}$ values is characterized by a standard deviation only slightly smaller than that for novae at maximum light and thus offers little promise for precise extragalactic distance determinations. A dozen faint and fast novae that are likely to be previously unidentified recurrent novae have been identified from their position in the MMRD plot and in the $M_{15}$ distribution.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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