Serendipitous Discovery of a Cataclysmic Variable in the Globular Cluster NGC 6624

Details Serendipitous Discovery of a Cataclysmic Variable in the Globular Cluster NGC 6624 Serendipitous Discovery of a Cataclysmic Variable in the Globular Cluster NGC 6624

1999-09-20

arxiv.org/abs/astro-ph/9909344v1

Astron.J. 118 (1999) 2888

Astronomy and Astrophysics

Astrophysics

11 pages including 4 figures and 1 table. Accepted for publication in The Astronomical Journal, December 1999

Scientific paper

10.1086/301150

Despite indications that classical cataclysmic variable (CV) stars are rare in globular clusters in general, and in the cluster NGC 6624 in particular, we have serendipitously discovered such a star ~6'' from the cluster center. A Hubble Space Telescope spectrum of the m~22 object shows strong, broad emission lines typical of numerous field CVs, and the inferred optical and UV luminosity are also similar. Our accidental observation also provides the first high-quality ultraviolet spectrum of a globular cluster CV. That we have detected such an object in an observation that includes just a few percent of the central area of the cluster may indicate that cluster CVs are more common than previously thought, at least near the core.

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