Physics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6729e&link_type=abstract
HST Proposal ID #6729
Physics
Hst Proposal Id #6729 Binaries And Star Fo
Scientific paper
We propose to obtain Faint Object Spectrograph (FOS) spectraof four CV/LMXB candidates discovered in the core of 47 Tuc.All of these stars are faint and variable, three of them lienear X-ray sources, and two of them are blue (where colors areavailable). We will use the spectra to determine whetherthese stars contain accretion disks, and to help distinguishbetween dwarf novae, magnetic CVs and neutron star systems.These observations are important for testing a new hypothesisthat magnetic CVs may be overabundant in globular clusters.Only one confirmed dwarf nova has been detected in 47 Tuc,although some theoretical estimates using tidal capture theoryhave predicted that dozens should be found. The recentdetection by us of 9 eclipsing binaries in the core of 47 Tucusing HST shows that binaries can form (or primordial binariessurvive) in the core of this dense cluster. These results mayfurther exacerbate the problem of the dearth of CVs in 47 Tuc.The confirmation that some of the dim X-ray sources inglobular clusters are binaries containing neutron stars wouldbe important for the formation of millisecond pulsars and forthe dynamics of dense clusters. Further study of the unusuallyrich and variable population of X-ray sources in 47 Tuc mayalso give us a new class of X-ray binaries.
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