The January 2015 outburst of a red nova in M 31
The January 2015 outburst of a red nova in M 31
复制标题
2015 年 1 月 M 31 中爆发的红色新星
DOI：
10.1051/0004-6361/201526564
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发表时间：
2015
影响因子：
6.5
通讯作者：
M. Stritzinger
中科院分区：
文献类型：
--
作者：
A. Kurtenkov;P. Pessev;T. Tomov;E. Barsukova;S. Fabrika;K. Vida;K. Hornoch;E. Ovcharov;V. Goranskij;A. Valeev;L. Moln'ar;K. S'arneczky;A. Kostov;P. Nedialkov;S. Valenti;S. Geier;K. Wiersema;M. Henze;A. Shafter;R. Dimitrova;V. Popov;M. Stritzinger
M31N 2015-01A(或M31LRN 2015)是2015年1月爆发的一颗红色新星--这是自1988年以来在M31观测到的第一次此类事件。截至2015年，几乎没有类似的事件得到证实。它们中的大多数被认为是恒星合并的产物。给出了2015年1月至3月期间对暂态进行广泛光学监测的结果。使用了8个光学望远镜进行成像。在BTA、GTC和罗珍2M望远镜上获得了光谱。我们给出了一个高精度的70d光曲线和天体测量学，不确定度为0.05“。在峰值亮度之前2-3d，颜色指数达到最小值，然后迅速增加。光谱类型在最大值前6d从F5I到F0I，然后在接下来的30d变成K3I。在光学极大值期间，瞬变的光度估计为8.7^^{+3.33}-2.2}\x 10^{5}L。光度和光谱结果都证实了该天体是一颗红新星，类似于V838单色调。
M31N 2015-01a (or M31LRN 2015) is a red nova that erupted in January 2015 -- the first event of this kind observed in M31 since 1988. Very few similar events have been confirmed as of 2015. Most of them are considered to be products of stellar mergers. Results of an extensive optical monitoring of the transient in the period January-March 2015 are presented. Eight optical telescopes were used for imaging. Spectra were obtained on BTA, GTC and the Rozhen 2m telescope. We present a highly accurate 70 d lightcurve and astrometry with a 0.05" uncertainty. The color indices reached a minimum 2-3 d before peak brightness and rapidly increased afterwards. The spectral type changed from F5I to F0I in 6 d before the maximum and then to K3I in the next 30 d. The luminosity of the transient was estimated to $8.7^{+3.3}_{-2.2}\times10^{5}L_{\odot}$ during the optical maximum. Both the photometric and the spectroscopic results confirm that the object is a red nova, similar to V838 Monocerotis.