Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...365l...9p&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 365, Dec. 10, 1990, p. L9-L12.
Astronomy and Astrophysics
Astrophysics
56
Pulsars, Stellar Rotation, White Dwarf Stars, X Ray Binaries, Neutron Stars, Stellar Gravitation, Stellar Mass Accretion, Supernova Remnants
Scientific paper
The enigmatic X-ray pulsar 1E 2259 + 586, located at the center of the supernova remnant G109.1 - 1.0, may be a recent merger of two white dwarfs, with a present rotation period of P = 6.98 s. The required mass is higher than 1.32 solar masses, making 1E 2259 + 586 the most massive white dwarf known. The surface gravity is well over one billion cm/sec sq, allowing the effective temperature to be as high as 2 million K, and opening up a possibility that the observed soft X-rays come from the white dwarf photosphere. The rate of rotational energy loss implied by the observed period increase is about 10 to the 36th ergs/s, a factor of a few more than the observed X-ray luminosity. If the interstellar extinction toward 1E 2259 + 586 is 4 mag, then the optical counterpart should be fainter than 26 mag. Observational and theoretical tests of this scenario are discussed.
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