NDLI: ART-P/Granat observations of the X-ray pulsar 4U0115+634 during the outburst in February 1990

Content Provider	Springer Nature Link
Author	Lutoviv, A. A. Grebenev, S. A. Sunyaev, R. A.
Copyright Year	2000
Abstract	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's 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 ∼1.3 × 10$^{12}$ 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.
Starting Page	1
Ending Page	8
Page Count	8
File Format	PDF
ISSN	10637737
Journal	Astronomy Letters
Volume Number	26
Issue Number	1
e-ISSN	15626873
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	2000-01-01
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Astronomy Astrophysics
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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ART-P/Granat observations of the X-ray pulsar 4U0115+634 during the outburst in February 1990