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arXiv 0812.1295astro-ph
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SDSS J162718.39 + 120435.0-周期间隙中的矮新星

SDSS J162718.39+120435.0 - a dwarf nova in the period gap

Jeremy Shears, Steve Brady, Boris Gaensicke, Tom Krajci, Ian Miller, Yenal Ogmen, Jochen Pietz, Bart Staels

摘要:

SDSS J162718.39 + 120435.0根据斯隆数字巡天提供的光谱观测被怀疑是一颗矮新星。在2008年爆发期间进行的测光,这是该物体有史以来第一次被探测到并实时跟踪的爆发,表明爆发最大达到14.6等,振幅为4.6等,持续了至少18天。发现了振幅高达0.4等的普通超级驼峰,确认它是SU UMa家族的成员。最初的超峰周期Psh为0.10993(7)天(2.638小时),但在爆发后,它随后降低到Psh = 0.10890(9)天(2.614小时)。周期变化对应于爆发平台期的结束。根据两个Psh值估计的轨道周期Porb在0.1026 d和0.1016 d之间,这使得SDSS 1627在激变变星的轨道周期分布中位于周期间隔的中心附近。

英文摘要:

SDSS J162718.39+120435.0 was suspected of being a dwarf nova from spectroscopic observations made available by the Sloan Digital Sky Survey. Photometry conducted during the 2008 outburst, the first ever outburst of this object detected and followed up in real time, shows that the outburst reached magnitude 14.6 at maximum, had an amplitude of 4.6 magnitudes and lasted for at least 18 days. Common superhumps were detected with an amplitude of up to 0.4 magnitudes, confirming it to be a member of the SU UMa family. Initially the superhump period, Psh, was 0.10993(7) days (2.638 hours), but it subsequently reduced to Psh = 0.10890(9) days (2.614 hours) later in the outburst. The period change corresponds to the end of the plateau period of the outburst. The orbital period, Porb, was estimated from the two Psh values as between 0.1026 d and 0.1016 d, which places SDSS1627 near the centre of the period gap in the orbital period distribution of cataclysmic variables.

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