Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...274l..31m&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 274, Nov. 1, 1983, p. L31-L35.
Astronomy and Astrophysics
Astrophysics
37
Globular Clusters, Stellar Spectra, Variable Stars, Astronomical Photography, Balmer Series, Binary Stars, Stellar Spectrophotometry
Scientific paper
Spectrophotometry and photographic photometry of the faint (V approximately 19), large-amplitude variable V4 in the globular cluster NGC 7099 (M30) have been obtained. The spectrum is that of a classical cataclysmic variable (CV), and the strength of the Balmer emission agrees well with that recently determined for a large sample of field CVs. The observations show the system significantly fainter than formerly reported, migitating a previously noted discrepancy between the inferred luminosity of V4 if a cluster member and the (uncertain) luminosity assigned to a field CV. It is suggested that V4 is in fact a member of M30, thus joining M5 V101 as the second spectroscopically confirmed example of a CV (and thus of a close binary system) in a globular cluster. The concentration parameters and predicted encounter rates of clusters with CV candidates significantly exceed the norm, consistent with a number of previous suggestions that formation of these systems is somehow dynamically enhanced.
Downes Ronald A.
Margon Bruce
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