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On the cyclotron line in Cepheus X-4

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McBride, V. A., Wilms, J., Kreykenbohm, I., Coe, M. J., Rothschild, Richard E., Kretschmar, P., Pottschmidt, K., Fisher, J. and Hamson, T.. (2007) On the cyclotron line in Cepheus X-4. Astronomy & Astrophysics, Vol.470 (No.3). pp. 1065-1070. ISSN 0004-6361

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Official URL: http://dx.doi.org/10.1051/0004-6361:20077238

Abstract

Context. Accreting X-ray pulsars provide us with laboratories for the study of extreme gravitational and magnetic fields, hence accurate descriptions of their observational properties contribute to our understanding of this group of objects.
Aims. We aim to detect a cyclotron resonance scattering feature in the Be/X-ray binary Cep X-4 and to investigate pulse profile and spectral changes through the outburst.
Methods. Spectral fitting and timing analysis are employed to probe the properties of Cep X-4 during an outburst in 2002 June.
Results. A previously announced cyclotron feature at 30.7 keV is confirmed, while the source shows spectral behaviour and luminosity related changes similar to those observed in previous outbursts. The long-term X-ray lightcurve shows a periodicity at 20.85 d, which could be attributed to the orbit in this Be system.

Item Type:

Journal Article

Subjects:

Q Science > QB Astronomy

Divisions:

Faculty of Science > Physics

Library of Congress Subject Headings (LCSH):

Pulsars, Stars -- Magnetic fields, X-ray binaries, X-ray sources, Galactic -- Accretion, Cyclotrons

Journal or Publication Title:

Astronomy & Astrophysics

Publisher:

EDP Sciences

ISSN:

0004-6361

Official Date:

August 2007

Dates:

Date	Event
August 2007	Published

Volume:

Vol.470

Number:

No.3

Page Range:

pp. 1065-1070

DOI:

10.1051/0004-6361:20077238

Status:

Peer Reviewed

Access rights to Published version:

Open Access

Funder:

National Research Foundation (South Africa), British Council, University of Southampton

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