Kuster, M. (Markus), Wilms, J. (Joern), Staubert, R., Heindl, W. A., Rothschild, Richard E., 1943-, Shakura, N. I. and Postnov, K. A.. (2005) Probing the outer edge of an accretion disk : a Her X-1 turn-on observed with RXTE. Astronomy & Astrophysics, Vol.443 (No.3). pp. 753-767. ISSN 0004-6361

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Abstract

We present the analysis of Rossi X-ray Timing Explorer (RXTE) observations of the turn-on phase of a 35 day cycle of the X-ray binary Her X-1. During the early phases of the turn-on, the energy spectrum is composed of X-rays scattered into the line of sight plus heavily absorbed X-rays. The energy spectra in the 3–17 keV range can be described by a partial covering model, where one of the components is influenced by photoelectric absorption and Thomson scattering in cold material plus an iron emission line at 6.5 keV. In this paper we show the evolution of spectral parameters as well as the evolution of the pulse profile during the turn-on. We describe this evolution using Monte Carlo simulations which self-consistently describe the evolution of the X-ray pulse profile and of the energy spectrum.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Double stars, X-ray sources, Galactic -- Accretion, Pulsars, Accretion (Astrophysics)
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	EDP Sciences
ISSN:	0004-6361
Date:	December 2005
Volume:	Vol.443
Number:	No.3
Page Range:	pp. 753-767
Identification Number:	10.1051/0004-6361:20042355
Status:	Peer Reviewed
Access rights to Published version:	Open Access
Funder:	Deutsche Forschungsanstalt für Luft- und Raumfahrt (DLR), Deutsche Forschungsgemeinschaft (DFG), North Atlantic Treaty Organization (NATO), United States. National Aeronautics and Space Administration (NASA), National Science Foundation (U.S.) (NSF)
Grant number:	50 OX0002 (DLR), 50 OR0302 (DLR), Sta 173/31-1 (DFG), PST.CL975254 (NATO), NAS5-30720 (NASA), NSF_INT- 9815741 (NSF), NSF_INT-0003773 (NSF)
References:	Arnaud, K., & Dorman, B. 2002, Xspec, An X-ray Spectral Fitting Package, User’s Guide for version 11.2.x, Tech. rep., HEASARC – Laboratory for High Energy Astrophysics – NASA/GSFC, available at http://heasarc.gsfc.nasa.gov/ docs/xanadu/xspec/manual/manual.html Bai, T. 1981, ApJ, 243, 244 Becker, R. H., Boldt, E. A., Holt, S. S., et al. 1977, ApJ, 214, 879 Boyd, P., Still, M., & Corbet, R. 2004, The Astronomer’s Telegram, 307, 1 Brainerd, J., & Lamb, F. K. 1987, ApJ, 317, L33 Burwitz, V., Dennerl, K., Predehl, P., & Stelzer, B. 2001, in Two Years of Science with Chandra, Abstracts from the Symposium held in Washington, DC, 5–7 September, 2001 Cheng, F. H., Vrtilek, S. D., & Raymond, J. C. 1995, ApJ, 452, 825 Coburn, W., Heindl, W. A., Wilms, J., et al. 2000, ApJ, 543, 351 Dal Fiume, D., Orlandini, M., Cusumano, G., et al. 1998, A&A, 329, 41 Davison, P. J. N., & Fabian, A. C. 1977, MNRAS, 178, 1 Deeter, J. E., Scott, D. M., Boynton, P. E., et al. 1998, ApJ, 502, 802 Giacconi, R., Gursky, H., Kellogg, E., et al. 1973, ApJ, 184, 227 Gruber, D. E., Matteson, J. L., Nolan, P. L., et al. 1980, ApJ, 240, L127 Kaastra, J. S., & Mewe, R. 1993, A&AS, 97, 443 Katz, J. 1973, Nature Physical Science, 246, 87 Ketsaris, N., Kuster, M., Postnov, K., et al. 2001, in Hot points in Astrophysics Kuster, M., Wilms, J., Blum, S., et al. 1999, Astrophys. Lett. Comm., 38, 161 Kylafis, N. D., & Klimis, G. S. 1987, ApJ, 323, 678 Kylafis, N. D., & Phinney, E. S. 1989, in Timing Neutron Stars, ed. H. Ögelman, & E. P. J. van den Heuvel (Dordrecht: Kluwer), NATO ASI, Vol. C262, 731 Leahy, D. A. 2004, Astron. Nachr., 325, 205 Lightman, A. P., Lamb, D. Q., & Rybicki, G. B. 1981, ApJ, 248, 738 Maloney, P., & Begelman, M. C. 1997, ApJ, 491, L43 Miller, M. C. 2000, ApJ, 537, 342 Nowak, M. A., Wilms, J., Vaughan, B. A., Dove, J. B., & Begelman, M. C. 1999, ApJ, 515, 726 Oosterbroek, T., Parmar, A. N., Orlandini, M., et al. 2001, A&A, 375, 922 Parmar, A. N., Sanford, P. W., & Fabian, A. C. 1980, MNRAS, 192, 311 Parmar, A. N., Pietsch, W., McKechnie, S., et al. 1985, Nature, 313, 119 Parmar, A. N., Oosterbroek, T., dal Fiume, D., et al. 1999, A&A, 350, L5 Schandl, S., & Meyer, F. 1994, A&A, 289, 149 Schandl, S., Staubert, R., & König, M. 1997, in Proc. of the Fourth Compton Symp., AIP Conf. Proc., 410, 763 Scott, D. M., & Leahy, D. A. 1999, ApJ, 510, 974 Scott, D. M., Leahy, D. A., & Wilson, R. B. 2000, ApJ, 539, 392 Shakura, N. I., Postnov, K. A., & Prokhorov, M. E. 1998, A&A, 331, L37 Shakura, N. I., Prokhorov, M. E., Postnov, K. A., & Ketsaris, N. A. 1999, A&A, 348, 917 Sobol, I. M. 1991, Die Monte Carlo Methode, 4th ed. (Berlin: Deutscher Verlag der Wissenschaften), engl. transl.: The Monte Carlo Method (Chicago: Univ. Chicago Press), 1974 Tananbaum, H., Gursky, H., Kellogg, E. M., et al. 1972, ApJ, 174, L143 Trümper, J., Kahabka, P., Ögelman, H., Pietsch, W., & Voges, W. 1986, ApJ, 300, L63 Verner, D. A., Ferland, G. J., Korista, K. T., & Yakovlev, D. G. 1996, ApJ, 465, 487 Vrtilek, S. D., & Cheng, F. H. 1996, ApJ, 465, 915 Vrtilek, S. D., Mihara, T., Primini, F. A., et al. 1994, ApJ, 436, L9 Wilms, J., Allen, A., & McCray, R. 2000, ApJ, 542, 914 Wilms, J., Nowak, M. A., Dove, J. B., Fender, R. P., & di Matteo, T. 1999, ApJ, 522, 460
URI:	http://wrap.warwick.ac.uk/id/eprint/3577

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