Discovery of Faint Ultraviolet Sources in the Globular Cluster NGC 6624 with the Hubble Space Telescope

Details Discovery of Faint Ultraviolet Sources in the Globular Cluster NGC 6624 with the Hubble Space Telescope Discovery of Faint Ultraviolet Sources in the Globular Cluster NGC 6624 with the Hubble Space Telescope

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...452l..29s&link_type=abstract

Astrophysical Journal Letters v.452, p.L29

Astronomy and Astrophysics

Astronomy

6

Ultraviolet: Stars, Galaxy: Globular Clusters: Individual Ngc Number: Ngc 6624

Scientific paper

Using the Faint Object Camera (FOC) on the Hubble Space Telescope (HST), we have identified three faint ultraviolet sources in the innermost ~15 arcseconds of the globular cluster NGC 6624. These sources are in addition to the previously discovered UV counterpart to the X-ray source 4U 1820-30, which is observed in the same field. At 1400 A, the sources have dereddened fluxes of 4.4 x 10-16 to 1.8 x 10-15 erg cm-2 s-1 A-1. The faintest source is within the field of view of an existing HST/FOC B image; its B magnitude is ~23.4, or MB ~ 7.8. The two fainter sources may be hot white dwarfs, although it would be unusual to observe two of these objects at such a young age. Alternatively, one or more of the sources could be hot, helium-burning subdwarfs. In particular, the brightest source may be on the extreme blue end of the horizontal branch, which would be notable, as NGC 6624 is a metal-rich cluster with a red horizontal branch. Finally, one or more of these stars could be cataclysmic variables. We briefly discuss future observations that could distinguish among these possibilities.

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