Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...366l..23m&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 366, Jan. 1, 1991, p. L23-L25.
Astronomy and Astrophysics
Astronomy
12
Accretion Disks, Pulsars, X Ray Binaries, Gamma Ray Telescopes, Sky Surveys (Astronomy), Stellar Luminosity, Stellar Mass Accretion, Stellar Rotation
Scientific paper
The region of sky containing the 38 s X-ray pulsar OAO 1657 - 415 has been observed on March 1990 with Sigma, an imaging gamma-ray telescope exploiting the coded mask technique. This observation has yielded an accurate (about arcminute-scale) localization for OAO 1657 - 415 at hard X-ray energy, confirming its association with a previously suggested soft X-ray candidate. A timing analysis of the 40-120 keV data has revealed for the first time a spin-down episode in OAO 1657 - 415, implying that an important change in the accretion torque experienced by this X-ray pulsar must have recently occurred.
Babalyan G. G.
Ballet Jean
Churazov Eugene
Gilfanov Marat
Khavenson N.
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