Rodríguez-Gil, P., Gänsicke, B. T. (Boris T.), Hagen, H.-J., Nogami, D., Torres, M. A. P., Lehto, H., Aungwerojwit, A. (Amornrat), Littlefair, S. P., Araujo-Betancor, S. and Engels, Dieter, 1950-. (2005) HS 0943+1404 : a true intermediate polar. Astronomy & Astrophysics, Vol.440 (No.2). pp. 701-709. ISSN 0004-6361

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Abstract

We have identified a new intermediate polar, HS 0943+1404, as part of our ongoing search for cataclysmic variables in the Hamburg Quasar Survey. The orbital and white dwarf spin periods determined from time-resolved photometry and spectroscopy are P orb 250 min and P spin = 69.171 ± 0.001 min, respectively. The combination of a large ratio P spin /P orb 0.3 and a long orbital period is very unusual compared to the other known intermediate polars. The magnetic moment of the white dwarf is estimated to be µ 1 ∼ 10 34 Gcm 3, which is in the typical range of polars. Our extensive photometry shows that HS 0943+1404 enters into deep (∼3 mag) low states, which are also a characteristic feature of polars. We therefore suggest that the system is a true “intermediate” polar that will eventually synchronise, that is, a transitional object between intermediate polars and polars. The optical spectrum of HS 0943+1404 also exhibits a number of unusual emission lines, most noticeably N II λ5680, which is likely to reflect enhanced nitrogen abundances in the envelope of the secondary.

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:	September 2005
Volume:	Vol.440
Number:	No.2
Page Range:	pp. 701-709
Identification Number:	10.1051/0004-6361:20053141
Status:	Peer Reviewed
Access rights to Published version:	Open Access
Funder:	Particle Physics and Astronomy Research Council (Great Britain) (PPARC), Deutsche Forschungsgemeinschaft (DFG), United States. National Aeronautics and Space Administration (NASA)
Grant number:	Re 353/11 (DFG), Re 353/22 (DFG), NAG5-9930 (NASA)
References:	Andronov, N., Pinsonneault, M., & Sills, A. 2003, ApJ, 582, 358 Araujo-Betancor, S., Gänsicke, B. T., Hagen, H.-J., et al. 2005, A&A, 430, 629 Araujo-Betancor, S., Gänsicke, B. T., Hagen, H.-J., Rodríguez-Gil, P., & Engels, D. 2003, A&A, 406, 213 Barrett, P., O’Donoghue, D., & Warner, B. 1988, MNRAS, 233, 759 Bertin, E., & Arnouts, S. 1996, A&AS, 117, 393 Buckley, D. A. H., Cropper, M., Ramsay, G., & Wickramasinghe, D. T. 1998, MNRAS, 299, 83 Buckley, D. A. H., Sekiguchi, K., Motch, C., et al. 1995, MNRAS, 275, 1028 Buckley, D. A. H., & Tuohy, I. R. 1989, ApJ, 344, 376 Gänsicke, B. T. 2004, in Compact Binaries in the Galaxy and Beyond, ed. G. Tovmassian, & E. Sion, Conf. Ser. 20, Rev. Mex. Astron. Astrofís., 152 Gänsicke, B. T., Araujo-Betancor, S., Hagen, H.-J., et al. 2004, A&A, 418, 265 Gänsicke, B. T., Szkody, P., de Martino, D., et al. 2003, ApJ, 594, 443 Gänsicke, B. T., Fried, R. E., Hagen, H.-J., et al. 2000, A&A, 356, L79 Gänsicke, B. T., Beuermann, K., & Reinsch, K., ed. 2002a, The Physics of Cataclysmic Variables and Related Objects, ASP Conf. Ser., 261 Gänsicke, B. T., Hagen, H. J., & Engels, D. 2002b, in The Physics of Cataclysmic Variables and Related Objects, ed. B. T. Gänsicke, K. Beuermann, & K. Reinsch, ASP Conf. Ser., 261, 190 Hagen, H. J., Groote, D., Engels, D., & Reimers, D. 1995, A&AS, 111, 195 Hellier, C. 2002, in The Physics of Cataclysmic Variables and Related Objects, ed. B. T. Gänsicke, K. Beuermann, & K. Reinsch, ASP Conf. Ser., 261, 92 Hellier, C., Mason, K. O., Rosen, S. R., & Cordova, F. A. 1987, MNRAS, 228, 463 Horne, K. 1986, PASP, 98, 609 Howell, S. B., Rappaport, S., & Politano, M. 1997, MNRAS, 287, 929 Jiang, X. J., Engels, D., Wei, J. Y., Tesch, F., & Hu, J. Y. 2000, A&A, 362, 263 King, A. R. 1988, QJRAS, 29, 1 King, A. R., & Lasota, J. P. 1991, ApJ, 378, 674 King, A. R., & Schenker, K. 2002, in The Physics of Cataclysmic Variables and Related Objects, ed. B. T. Gänsicke, K. Beuermann, & K. Reinsch, ASP Conf. Ser., 261, 233 King, A. R., & Wynn, G. A. 1999, MNRAS, 310, 203 Kolb, U. 1993, A&A, 271, 149 Kolb, U., & Baraffe, I. 1999, MNRAS, 309, 1034 Lipkin, Y. M., Leibowitz, E.M., &Orio, M. 2004, MNRAS, 349, 1323 Norton, A. J., Hellier, C., Beardmore, A. P., et al. 1997, MNRAS, 289, 362 Norton, A. J.,Wynn, G. A., & Somerscales, R. V. 2004, ApJ, 614, 349 Podsiadlowski, P., Han, Z.,& Rappaport, S. 2003, MNRAS, 340, 1214 Reimers, D., & Hagen, H. J. 2000, A&A, 358, L45 Reimers, D., Hagen, H. J., & Hopp, U. 1999, A&A, 343, 157 Rodríguez-Gil, P., Gänsicke, B. T., Araujo-Betancor, S., & Casares, J. 2004a, MNRAS, 349, 367 Rodríguez-Gil, P., Gänsicke, B. T., Barwig, H., Hagen, H.-J., & Engels, D. 2004b, A&A, 424, 647 Scargle, J. D. 1982, ApJ, 263, 835 Schenker, K., & King, A. R. 2002, in The Physics of Cataclysmic Variables and Related Objects, ed. B. T. Gänsicke, K. Beuermann, & K. Reinsch, ASP Conf. Ser., 261, 242 Schenker, K., King, A. R., Kolb, U., Wynn, G. A., & Zhang, Z. 2002, MNRAS, 337, 1105 Schneider, D. P., & Young, P. 1980, ApJ, 238, 946 Schwarzenberg-Czerny, A. 1989, MNRAS, 241, 153 Thorstensen, J. R., & Fenton, W. H. 2002, PASP, 114, 74 Vogt, N., Krzeminski, W., & Sterken, C. 1980, A&A, 85, 106 Warner, B. 1986, MNRAS, 219, 347 Warner, B. 1999, in Annapolis Workshop on Magnetic Cataclysmic Variables, ed. C. Hellier, & K. Mukai, ASP Conf. Ser., 157, 63 Warner, B., & Wickramasinghe, D. T. 1991, MNRAS, 248, 370
URI:	http://wrap.warwick.ac.uk/id/eprint/3584

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