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

Abstract

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.

12 pages, 11 figures. Accepted for publication in MNRAS

References in corpus (11)

• A Deep Chandra Survey of the Globular Cluster 47 Tucanae: Catalog of Point Sources
• Formation and evolution of compact binaries in globular clusters: I.Binaries with white dwarfs
• An Extensive Census of HST Counterparts to Chandra X-ray Sources in the Globular Cluster 47 Tucanae. I. Astrometry and Photometry
• An Extensive Census of HST Counterparts to Chandra X-ray Sources in the Globular Cluster 47 Tucanae. II. Time Series and Analysis
• Identification of Faint Chandra X-ray Sources in the Core-Collapsed Globular Cluster NGC 6397: Evidence for a Bimodal Cataclysmic Variable Population
• A Far-Ultraviolet Survey of 47 Tucanae.II The Long-Period Cataclysmic Variable AKO 9
• The defining characteristics of Intermediate Polars - the case of three candidate systems
• X-ray sources and their optical counterparts in the globular cluster M 22
• Cluster AgeS Experiment (CASE): Deficiency of observed dwarf novae in globular clusters
• Multiple Outbursts of a Cataclysmic Variable in the Globular Cluster M22
• Spectral Mapping of the Intermediate Polar DQ Herculis

Cited by in corpus (4)

• Cataclysmic Variables from the Catalina Real-time Transient Survey
• One thousand cataclysmic variables from the Catalina Real-time Transient Survey
• CV1 in the globular cluster M 22: confirming its nature through X-ray observations and optical spectroscopy
• Reevaluating the Origin of Detectable Cataclysmic Variables in Globular Clusters: Testing the Importance of Dynamics