Faint blue stars in the core of NGC 6397

Details Faint blue stars in the core of NGC 6397 Faint blue stars in the core of NGC 6397

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...281l..13d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 281, no. 1, p. L13-L16

Astronomy and Astrophysics

Astrophysics

24

Blue Stars, Cataclysmic Variables, Faint Objects, Globular Clusters, X Ray Sources, Color-Magnitude Diagram, Faint Object Camera, Hubble Space Telescope, Stellar Magnitude, Stellar Temperature

Scientific paper

The inner core of the globular cluster NGC 6397 within approximately 6 arcsecs of the geometrical centre has been investigated with high resolution deep images taken through several medium- and broad-band UV filters with the Faint Object Camera (FOC) on board the Hubble Space Telescope (HST). Approximately 110 stars down to instrumental magnitude m210 approximately equal to 23 were reliably identified in this region and located on a UV-U color magnitude diagram for the first time. The main sequence is well defined down to visual magnitude approximately equal to 6.3, corresponding to a mass of approximately 0.6 solar mass. Four faint blue stars are identified, with UV-U band coarse spectra compatible with black body temperatures in the range 10,000-20,000 K, whose fluxes show considerable variability over a 5 hour time interval. The four objects are all located inside the 90% confidence radius around the position of the possibly multiple low luminosity X-ray source C3 (Cool. 1993), and as such are strong candidates to the optical counterparts. The estimated LX/LV ratio suggests that these objects are cataclysmic variables.

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