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arXiv 1106.0433astro-ph.HE
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两个球状星团CV的地面和太空研究:M22 CV1和M5 V101

Ground and space-based study of two globular cluster CVs: M22 CV1 and M5 V101

A. P. Hourihane, P. J. Callanan, A. M. Cool, M. T. Reynolds

摘要:

激变变星作为一类具有大结合能的致密双星,在球状星团的动力学演化中起着重要作用。作为系统搜索球状星团中经历矮新星爆发的CV的一部分,我们2004年的M22监测计划在5月期间检测到矮新星候选者CV 1的爆发。我们实现ISIS图像减法例程以获得CV1爆发的光变曲线。我们提出的爆发光曲线,以及在V,U和近紫外(nUV)波段和钱德拉/ACIS-S光谱的对象的HST/WFPC 2测光。我们的结果证实了DN性质的爆发和CV状态的对象。我们还提出了另一个球状星团CV,M5 V101的地面研究的结果-包括静态中分辨率WHT/ISIS光谱在B和R波段,显示突出的巴耳末和氦发射,和R-波段测光。

英文摘要:

As a class of compact binaries with large binding energy, cataclysmic variables formed through close encounters play an important role in the dynamical evolution of globular clusters. As part of a systematic search for CVs undergoing dwarf nova eruptions in globular clusters, our 2004 monitoring programme of M22 detected an outburst of the dwarf nova candidate CV1 during May. We implement the ISIS image subtraction routine to obtain a light curve for an outburst of CV1. We present the outburst light curve as well as HST/WFPC2 photometry in the V, U and near ultra-violet (nUV) bands and a Chandra/ACIS-S spectrum of the object. Our results confirm the DN nature of the outburst and the CV status of the object. We also present the results of a ground-based study of another globular cluster CV, M5 V101 - including quiescent medium-resolution WHT/ISIS spectroscopy in the B and R bands, displaying prominent Balmer and HeI emission, and R-band photometry.

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