Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000astl...26....1l&link_type=abstract
Astronomy Letters, vol. 26, p. 1-8 (2000)
Astronomy and Astrophysics
Astronomy
3
Scientific paper
Observations of the transient X-ray pulsar 4U0115+634 with the ART-P telescope aboard the GRANAT observatory during the outburst in February 1990 are presented. The source exhibited a strong, regular and irregular variability, including X-ray bursts of duration 300-500 s. Two absorption features were detected in the source photon spectrum at 12 and 22 keV, which were interpreted as the lines of resonance scattering of its emission at the first and second cyclotron harmonics. The magnetic-field strength B on the neutron-star surface that corresponds to these lines is of about 1.3 x 1012 G. The ratio of the line energies slightly differs from the harmonic ratio 1:2. Moreover, this ratio and the line energies themselves vary appreciably with phase on a time scale of one pulsation period. The dependence of other spectral parameters for 4U0115+634 on pulse phase is investigated.
Grebenev Sergei A.
Lutovinov Alexander A.
Sunyaev Rashid A.
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