在大量数字化档案施密特板上系统地寻找M31中的新星
A systematic search for novae in M31 on a large set of digitized archival Schmidt plates
摘要:
本文报道了在我们的邻居星系M31的基础上,数字化的历史陶滕堡施密特板光学新星的检测。探测到的新星的精确位置导致在M31中搜索复发新星时的数据库要大得多。我们进行了系统的搜索新星306数字化陶滕堡施密特板涵盖了36年的时间跨度从1960年至1996年。从数据库中的约30万条光变曲线和每个色带仅一个板上的约100万个检测结果中,通过自动算法有效地选择新星候选者,随后通过肉眼单独检查。我们报告的84新星候选人的检测。我们从光变曲线的自动分析中发现了55颗新星候选者。其中,22颗是以前未知的,12颗是已知的,但以前没有在陶滕堡施密特板上被发现,21颗新星以前在陶滕堡板上被发现。另外29颗已知的新星可以通过对单个探测的详细研究来确认。我们新发现的一颗新星候选者与大约30年前探测到的一颗新星位置重合。因此,该天体很可能是一颗复发新星。此外,我们重新调查了之前在陶腾堡板块上发现的所有41颗新星候选者,并确认了除两颗之外的所有候选者。所有新星候选者的位置都以~ 0.4角秒的典型精度给出。我们提供光变曲线和查找图表作为在线材料。对盘子的分析显示了仍然埋藏在旧盘子档案中的丰富信息。从这次调查中推断,其他历史M31板块档案(例如来自威尔逊山天文台或Asiago天文台)的数字化用于系统的新星搜索看起来非常有希望。
英文摘要:
This paper reports on the detection of optical novae in our neighbour galaxy M31 based on digitized historical Tautenburg Schmidt plates. The accurate positions of the detected novae lead to a much larger database when searching for recurrent novae in M31. We conducted a systematic search for novae on 306 digitized Tautenburg Schmidt plates covering a time span of 36 years from 1960 to 1996. From the database of both ~ 300 000 light curves and about one million detections on only one plate per colour band, nova candidates were efficiently selected by automated algorithms and subsequently individually inspected by eye. We report the detection of 84 nova candidates. We found 55 nova candidates from the automated analysis of the light curves. Among these, 22 were previously unknown, 12 were known but not identified on Tautenburg Schmidt plates before, and 21 novae had been previously discovered on Tautenburg plates. An additional 29 known novae could be confirmed by the detailed investigation of single detections. One of our newly discovered nova candidates shows a high position coincidence with a nova detected about 30 years earlier. Therefore, this object is likely to be a recurrent nova. Furthermore, we re-investigated all 41 nova candidates previously found on Tautenburg plates and confirm all but two. Positions are given for all nova candidates with a typical accuracy of ~ 0.4 arcsec. We present light curves and finding charts as online material. The analysis of the plates has shown the wealth of information still buried in old plate archives. Extrapolating from this survey, digitization of other historical M31 plate archives (e.g. from the Mount Wilson or Asiago observatories) for a systematic nova search looks very promising.
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