Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-07-03
Astronomy and Astrophysics
Astrophysics
5 pages LaTeX 2.09, uses MNRAS style. Submitted to the Monthly Notices of the Royal Astronomical Society. gzipped .ps file ava
Scientific paper
The core of the galactic globular cluster M13 (NGC 6205) has been observed with WFPC2 on the Hubble Space Telescope through visual, blue and mid- and far-UV filters in a programme devoted to study the UV population in a sample of Galactic globular clusters. In the UV Color Magnitude Diagrams derived from the HST images we have discovered three faint objects with a strong UV excess, which lie significantly outside the main loci defined by more than 12,000 normal cluster stars. The positions of two of the UV stars are nearly coincident (7" & 1") to those of a low luminosity X-ray source recently found in the core of M13 and to a 3.5-sigma peak in the X-ray contour map. We suggest that the UV stars are physically connected to the X-ray emission. The UV stars are very similar to the quiescent nova in the globular cluster M80, and they might be a, perhaps new, subclass of cataclysmic variable.
Dorman Ben
Ferraro Francesco R.
Fusi Pecci Flavio
Paltrinieri Barbara
Rood Robert T.
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