EDP Sciences
Free access
Issue
A&A
Volume 433, Number 3, April III 2005
Page(s) L45 - L48
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:200500023


A&A 433, L45-L48 (2005)
DOI: 10.1051/0004-6361:200500023

Letter

INTEGRAL observation of V 0332+53 in outburst

I. Kreykenbohm1, 2, N. Mowlavi2, 3, N. Produit2, 3, S. Soldi2, 3, R. Walter2, 3, P. Dubath2, 3, P. Lubinski4, 2, M. Türler2, 3, W. Coburn5, A. Santangelo1, R. E. Rothschild5 and R. Staubert1

1  Institut für Astronomie und Astrophysik - Astronomie, Sand 1, 72076 Tübingen, Germany
2  INTEGRAL Science Data Centre, 16 Ch. d'Écogia, 1290 Versoix, Switzerland
    e-mail: Ingo.Kreykenbohm@obs.unige.ch
3  Observatoire de Genève, Chemin des Maillettes 51, 1290 Sauverny, Switzerland
4  N. Copernicus Astronomical Center, Bartycka 18, Warsaw 00-716, Poland
5  Space Sciences Laboratory, University of California, Berkeley, Berkeley, CA, 94702-7450, USA

(Received 18 January 2005 / Accepted 9 February 2005)

Abstract
We present the analysis of a 100 ks INTEGRAL (3-100 ${\rm keV}$) observation of the transient X-ray pulsar V 0332+53in outburst. The source is pulsating at $P_{\rm Pulse}=4.3751\pm0.0002$ s with a clear double pulse from 6 ${\rm keV}$to 60 ${\rm keV}$. The average flux was ~550 mCrab between 20 ${\rm keV}$and 60 ${\rm keV}$. We modeled the broad band continuum from 5 ${\rm keV}$to 100 ${\rm keV}$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 ${\rm keV}$, the first harmonic at 50.5 +0.1-0.1 ${\rm keV}$as well as the second harmonic at 71.7 +0.7-0.8 ${\rm keV}$, thus confirming the discovery of the harmonic lines by Coburn et al. (2005) in RXTEdata.


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

SIMBAD Objects



© ESO 2005