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

Author： Hourihane A. P. Callanan P. J. Cool A. M. Reynolds M. T.

ISSN： 0035-8711

Source： Monthly Notices of the Royal Astronomical Society, Vol.414, Iss.1, 2011-06, pp. : 184-194

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Abstract

ABSTRACTAs a class of compact binaries with large binding energy, cataclysmic variables (CVs) 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 (DN) eruptions in globular clusters, our 2004 monitoring programme of M22 detected an outburst of the DN candidate CV1 during May. We implement theisisimage subtraction routine to obtain a light curve for an outburst of CV1. We present the outburst light curve as well as Hubble Space Telescope/Wide-Field Planetary Camera 2 (WFPC2) photometry in the V, U and near-ultraviolet (nUV) bands and a Chandra/Advanced CCD Imaging Spectrometer (ACIS) 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 William Herschel Telescope (WHT)/Intermediate dispersion Spectrograph and Imaging System (ISIS) spectroscopy in the B and R bands, displaying prominent Balmer and He iemission, and R-band photometry.