X-ray evidence for white dwarf binaries in globular clusters

Details X-ray evidence for white dwarf binaries in globular clusters X-ray evidence for white dwarf binaries in globular clusters

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...267l..83h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 267, April 15, 1983, p. L83-L87.

Astronomy and Astrophysics

Astrophysics

85

Binary Stars, Globular Clusters, White Dwarf Stars, X Ray Sources, Heao 2, Histograms, Luminosity, Neutron Stars, Variable Stars

Scientific paper

Data from an X ray survey of globular clusters by means of instrumentation on the Einstein Observatory indicate the existence of a distinct class of low-luminosity (L) sources. L was measured in the 10 to the 32nd to 10 to the 34th ergs/sec range when viewing point-like objects. The L-value is three orders of magnitude less than that of neutron star binaries, and is consistent with projections for binaries with 0.5 solar mass white dwarfs. They were located outside the cluster cores, which was taken as an indication of low mass. More than three sources at the lowest luminosity bound were observed in two clusters, suggesting a steep rise in the luminosity function, which agreed with observational data on galactic plane cataclysmic variables.

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