Spectroscopic Identification of Candidate Cataclysmic Variable Stars Near the Center of the Post-Core Globular Cluster NGC 6397: CYCLE4 High

Details Spectroscopic Identification of Candidate Cataclysmic Variable Stars Near the Center of the Post-Core Globular Cluster NGC 6397: CYCLE4 High Spectroscopic Identification of Candidate Cataclysmic Variable Stars Near the Center of the Post-Core Globular Cluster NGC 6397: CYCLE4 High

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5497g&link_type=abstract

HST Proposal ID #5497

Computer Science

Hst Proposal Id #5497 Hot Stars X-Ray Binaries

Scientific paper

We propose to obtain FOS spectra of three candidate cataclysmic variables (CVs) near the center of the nearby post-core-collapse globular cluster NGC 6397. These objects are located in the error circles of faint x-ray sources discovered with the ROSAT High Resolution Imager (HRI), and thus represent possible optical counterparts. We discovered these CV candidates in an imaging study of NGC 6397 in H-alpha and "R" filters performed with the HST Planetary Camera (PC). Photometry we have performed of the roughly 2200 stars in the PC field indicates that these three stars have absolute magnitudes and H-alpha emission line strengths typical of CVs. These stars also have the UV-excesses expected of CVs, as determined from a comparison of the PC data to several archival HST-FOC images of the cluster in UV filters. These objects are excellent candidates to be the long-sought CVs in globular clusters; spectroscopy is required to test this hypothesis. Due to the extreme crowding at the center of NGC 6397, spectroscopy of these faint candidates requires the angular resolution provided by HST. This study, which represents the final stage of our efforts to identify compact binaries in globular clusters, will provide a critical test of theories for the formation and evolution in clusters of interacting binaries and their progeny -- CVs, low-mass X-ray binaries, and millisecond pulsars.

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