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XMM-Newton observations of AM CVn binaries : V396 Hya and SDSS J1240-01

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Ramsay, G. (Gavin), Groot, P. J. (Paul J.), Marsh, T. R., Nelemans, G., Steeghs, D. (Danny), 1972- and Hakala, P.. (2006) XMM-Newton observations of AM CVn binaries : V396 Hya and SDSS J1240-01. Astronomy & Astrophysics, Vol.457 (No.2). pp. 623-627. ISSN 0004-6361

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Official URL: http://dx.doi.org/10.1051/0004-6361:20065491

Abstract

We present the results of XMM-Newton observations of two AM CVn systems - V396 Hya and SDSS J1240-01. Both systems are detected in X-rays and in the UV: neither shows coherent variability in their light curves. We compare the rms variability of the X-ray and UV power spectra of these sources with other AM CVn systems. Apart from ES Cet, AM CVn sources are not strongly variable in X-rays, while in the UV the degree of variability is related to the systems apparent brightness. The X-ray spectra of V396 Hya and SDSS J1240-01 show highly non-solar abundances, requiring enhanced nitrogen to obtain good fits. We compare the UV and X-ray luminosities for 7 AM CVn systems using recent distances. We find that the X-ray luminosity is not strongly dependent upon orbital period. However, the UV luminosity is highly correlated with orbital period with the UV luminosity decreasing with increasing orbital period. We expect that this is due to the accretion disk making an increasingly strong contribution to the UV emission at shorter periods. The implied luminosities are in remarkably good agreement with predictions.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Cataclysmic variable stars
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	EDP Sciences
ISSN:	0004-6361
Date:	October 2006
Volume:	Vol.457
Number:	No.2
Number of Pages:	5
Page Range:	pp. 623-627
Identification Number:	10.1051/0004-6361:20065491
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	European Space Agency (ESA), United States. National Aeronautics and Space Administration (NASA), Suomen Akatemia [Academy of Finland], Smithsonian Astrophysical Observatory, Nederlandse Organisatie voor Wetenschappelijk Onderzoek [Netherlands Organisation for Scientific Research] (NWO), Particle Physics and Astronomy Research Council (Great Britain) (PPARC)
Grant number:	NNG04G30G (NASA), NNG06GC05G (NASA), 639.042.201 (NWO), 639.041.405 (NWO)
References:	Arnaud, K.A., 1996, Astronomical Data Analysis Software and Systems V, eds. Jacoby G. and Barnes J., p17, ASP Conf. Series volume 101 Baskill, D. S., Wheatley, P. J., Osborne, J. P., 2005, MNRAS, 357, 626 Bildsten, L., Townsley, D. M., Deloye, C. J., Nelemans, G., 2006, ApJ, 640, 466 Bohlin, R. C., Savage, B. D., Drake, J. F., 1978, ApJ, 224, 132 Deloye, C. J., Bildsten, L., & Nelemans, G., 2005, ApJ, 624, 934 Espaillat, C., Patterson, J., Warner, B., Woudt, P., 2005, PASP, 117, 189 G¨ansicke, B. T., Szkody, P., de Martino, D., Beuermann, K., Long, K. S., Sion, E. M., Knigge, C., Marsh, T., Hubeny, I., 2003, ApJ, 594, 443 Hakala, P., Ramsay, G., Byckling, K., 2004, MNRAS, 453 King, A. R., 1988, QJRAS, 29, 1 Marsh, T. R., Wood, J. H., Horne, K., Lambert, D., 1995, MNRAS, 274, 452 Mason K. O., et al 2001, A&A, 365, L36 Nelemans, G., Portegies Zwart, S. F., Verbunt, F., Yungelson, L R., 2001, A&A, 368, 939 Ramsay, G., Hakala, P., Marsh, T., Nelemans, G., Steeghs, D., Cropper, M., 2005, A&A, 440, 675 Roelofs, G. H. A., Groot, P. J., Steeghs, D., Nelemans, G., 2004, Rev Mex astron Astrofis, 20, 254 Roelofs, G. H. A., Groot, P. J., Marsh, T. R., Steeghs, D., Barros, S. C. C., Nelemans, G., 2005, MNRAS, 361, 487 Roelofs, G. H. A, Groot, P. J., Benedict, F. G, McArthur, B., et al., to be submitted to ApJ, 2006 Ruiz, M. T., Rojo, P. M., Garay, G., Maza, J., 2001a, ApJ, 552, 679 Ruiz, M. T., Wischnjewsky, M., Rojo, P. M., Gonzalez, L. E., 2001b, ApJS, 133, 119 Sion, E. M., Solheim, J.-K., Szkody, P., Gaensicke, B. T., Howell, S. B., 2006, ApJ, 636, L125 Steeghs, D., et al, to be submitted to ApJ, 2006 Strohmayer, T. E., 2004a, ApJ, 608, L53 Strohmayer, T. E., 2004b, ApJ, 614, 358 Str¨uder L., et al, 2001, 365, L18 van Teeseling, A., Verbunt, F., 1994, A&A, 292, 519 van Teeseling, A., Beuermann, K., Verbunt, F., 1996, A&A, 315, 467 Turner M., et al 2001, A&A, 365, L27
URI:	http://wrap.warwick.ac.uk/id/eprint/33107