On the nature of the X-ray pulsar near LYNDS 1457

Details On the nature of the X-ray pulsar near LYNDS 1457 On the nature of the X-ray pulsar near LYNDS 1457

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...361..173p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 361, Sept. 20, 1990, p. 173-180.

Mathematics

Probability

18

Astronomical Models, Molecular Clouds, Pulsars, X Ray Binaries, Cataclysmic Variables, Magnetic Stars, Neutron Stars, Stellar Rotation, White Dwarf Stars

Scientific paper

The rotation of a magnetized white dwarf or neutron star accidentally located within or behind the Lynds 1457 molecular cloud, is considered as a model for the hard X-ray source H0253 + 193. It is calculated that all models of this type have a low a priori probability because the positions are so remarkably coincident and because the objects involved are not sufficiently common. A neutron star accreting in a close binary is rejected because its likelihood is extremely small and because the observed position, luminosity, and spectrum of the object are all quite atypical for X-ray binaries. Two other possibilities are considered: (1) an isolated white dwarf or neutron star drifting accidentally into the cloud and accreting sufficient gas to power the X-ray source and (2) a white dwarf accreting in a close binary.

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