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Institut für Astronomie und Astrophysik

Abteilung Astronomie

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Preprint 02/05

INTEGRAL observation of V0332+53 in outburst

Kreykenbohm, I. (1,2), Mowlavi, N. (2), Produit, N. (2), Soldi, S. (2), Walter, R. (2), Dubath, P. (2), Lubiński, P. (3,2), Türler, M. (2), Coburn, W. (4), Santangelo, A. (1), Rothschild, R. E. (5), Staubert, R. (1)

(1) Institut für Astronomie und Astrophysik - Astronomie, Sand 1, 72076 Tübingen, Germany
(2) INTEGRAL Science Data Centre, 16 Ch. d'Écogia, 1290 Versoix, Switzerland
(3) N. Copernicus Astronomical Center, Bartycka 18, Warsaw 00-716, Poland
(4) Space Sciences Laboratory, University of California, Berkeley, Berkeley, CA, 94702-7450, USA
(5) University of California at San Diego, La Jolla, CA 92093-0424, U.S.A.

A&A 433, L45-L48 (2005)

Abstract. We present the analysis of a 100 ks INTEGRAL (3-100 keV) observation of the transient X-ray pulsar V0332+53 in outburst. The source is pulsating at PPulse=4.3751±0.0002 s with a clear double pulse from 6 keV to 60 keV. The average flux was ~550 mCrab between 20 keVand 60 keV. We modeled the broad band continuum from 5 keV to 100 keV with a power-law modified by an exponential cut off. We observe three cyclotron lines: the fundamental line at 24.9+0.1-0.1 keV, the first harmonic at 50.5+0.1-0.1 keV as well as the second harmonic at 71.7+0.7-0.8 keV, thus confirming the discovery of the harmonic lines by Coburn et al. (2005) in RXTE data.

Key words: X-rays: stars, stars: flare, stars:, pulsars: individual: V0332+53, stars: magnetic fields

Preprint (294 kb PDF file including figures)

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