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Title:
BeppoSAX observations of the long period polar system V1309Ori
Authors:
de Martino, D.; Barcaroli, R.; Matt, G.; Mouchet, M.; Belloni, T.; Beuermann, K.; Chiappetti, L.; Done, C.; Gänsicke, B. T.; La Franca, F.; Mukai, K.
Affiliation:
AA(Osservatorio Astronomico di Capodimonte, Via Moiariello 16, I-80131 Napoli, Italy), AB(Dipartimento di Fisica, Universita' degli studi ``Roma Tre'', Via della Vasca Navale 84, I-00146 Roma, Italy), AC(Dipartimento di Fisica, Universita' degli studi ``Roma Tre'', Via della Vasca Navale 84, I-00146 Roma, Italy), AD(DAEC, Observatoire de Paris, Section de Meudon, F-92195 Meudon Cedex, France; University Denis Diderot, Place Jussieu, F-75005 Paris, France), AE(Astronomical Institute ``Anton Pannekoek'', University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands), AF(Universitaets Sternwarte, Geismarlandstr. 11, D-37083 Goettingen, Germany), AG(Istituto di Fisica Cosmica CNR, Via Bassini 15, Milano, Italy), AH(Department of Physics, University of Durham, South Road, Durham DH1 3LE, UK), AI(Universitaets Sternwarte, Geismarlandstr. 11, D-37083 Goettingen, Germany), AJ(Dipartimento di Fisica, Universita' degli studi ``Roma Tre'', Via della Vasca Navale 84, I-00146 Roma, Italy), AK(NASA/GSFC, Code 668 Greenbelt MD 20771, USA)
Publication:
Astronomy and Astrophysics, v.332, p.904-908 (1998) (A&A Homepage)
Publication Date:
04/1998
Origin:
A&A
A&A Keywords:
STARS: INDIVIDUAL: V1309 ORI= RXJ0515.6+0105, CATACLYSMIC VARIABLES, X-RAYS: STARS
Bibliographic Code:
1998A&A...332..904D

Abstract

We present BeppoSAX observations of the peculiar long period polar system V1309Ori (RXJ0515.6+0105). The source was detected simultaneously at soft and, for the first time, at hard X-rays with the LECS and the MECS detectors. Both, the LECS and the MECS light curves are irregular with a bursting/flaring type behaviour indicating inhomogeneous accretion onto the white dwarf. This peculiar variability, together with an extreme high soft-to-hard X-ray luminosity ratio, indicates that in V1309Ori accretion occurs predominantly in highly compressed chunks or ``blobs'' of matter. From coordinated ESO optical spectroscopy, we find indications that the magnetic field strength of the white dwarf is < 70MG, not expected either from the 8hr orbital period synchronism or from the strong soft-to-hard X-ray ratio suggesting alternative solutions for sustaining synchronism in this system. Also based on observations collected at the European Southern Observatory, La Silla, Chile

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