Long, Knox S., Gänsicke, B. T. (Boris T.), Knigge, Christian, Froning, Cynthia S. and Monard, Berto. (2009) The effect of a superoutburst on the white dwarf and disk of VW Hydri as observed with FUSE. The Astrophysical Journal, Vol.697 (No.2). pp. 1512-1528. ISSN 0004-637X

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Abstract

We have used Far Ultraviolet Spectroscopic Explorer (FUSE) to obtain a series of 13 observations of the nearby dwarf nova VW Hyi that cover the period from the end of a superoutburst through the following normal outburst of the system. Here, we present the quiescent spectra taken after each outburst event. The spectra obtained during quiescence contain at least three components. The dominant component over most of the FUSE wavelength range is the white dwarf (WD), which cools following the superoutburst. The amount of cooling is dependent on the WD models utilized. For log g of 8.0, the temperature drops from 24,000 K just after the outburst to 20,000 K just before the normal outburst. For this model, and for a distance of 65 pc, the radius of the WD is approximately 8 x 10(8) cm and nu sin (i) is similar to 420 km s(-1). The fact that the derived radius is smaller than expected for a WD with log g = 8 suggests a higher gravity WD or that VW Hyi is somewhat further than its canonical distance of 65 pc. Either is possible given the current uncertainty (+/- 20 pc) in the distance to VW Hyi. Earlier suggestions that the WD photosphere show evidence of CNO processed material are confirmed, but our analysis also highlights the fact that significant issues remain in terms of analyzing the spectra of WDs in such unusual physical situations. The second component is relatively featureless and shows substantial modulation on the orbital (and just after outburst, the superhump) period. The second component is most likely associated with the hot spot where material from the secondary encounters the disk, rather than emission from the boundary layer region between the inner disk and WD. This second component fades about 10 days after the superoutburst. There is also a third component, clearly visible in terms of broad emission lines of C III lambda 977, N III lambda 991, and a combination of Ly beta and O VI..1032, 1038, which appears to be accompanied by a flat continuum. The strength of the emission lines, which are almost surely associated with the accretion disk, appears relatively constant for the duration of the observations.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Double stars, Cataclysmic variable stars, Ultraviolet stars, Stars, New
Journal or Publication Title:	The Astrophysical Journal
Publisher:	Institute of Physics Publishing, Inc.
ISSN:	0004-637X
Date:	1 June 2009
Volume:	Vol.697
Number:	No.2
Number of Pages:	17
Page Range:	pp. 1512-1528
Identification Number:	10.1088/0004-637X/697/2/1512
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	United States. National Aeronautics and Space Administration (NASA)
Grant number:	NNG04GQ38G
References:	Araujo-Betancor, S., et al. 2005, A&A, 430, 629 Armitage, P. J., & Livio, M. 1996, ApJ, 470, 1024 Bergeron, P., Leggett, S. K., & Ruiz, M. T. 2001, ApJS, 133, 413 Dixon, W. V., et al. 2007, PASP, 119, 527 G¨ansicke, B. T., & Beuermann, K. 1996, A&A, 309, L47 G¨ansicke, B. T., Szkody, P., Howell, S. B., & Sion, E. M. 2005, ApJ, 629, 451 G¨ansicke, B. T., et al. 2003, ApJ, 594, 443 Godard, B. 2004, IDF Cookbook, Version 1.0 (Baltimore, MD: Johns Hopkins Univ.), http://fuse.pha.jhu.edu/analysis/idfcook.index.html Godon, P., & Sion, E. M. 2005, MNRAS, 361, 809 Godon, P., Sion, E. M., Cheng, F., Long, K. S., G¨ansicke, B. T., & Szkody, P. 2006, ApJ, 642, 1018 Godon, P., Sion, E. M., Cheng, F. H., Szkody, P., Long, K. S., & Froning, C. S. 2004, ApJ, 612, 429 Hamada, T., & Salpeter, E. E. 1961, ApJ, 134, 683 Harrison, T. E., Howell, S. B., Szkody, P., & Cordova, F. A. 2005a, ApJ, 632, L123 Harrison, T. E., Johnson, J. J., McArthur, B. E., Benedict, G. F., Szkody, P., Howell, S. B., & Gelino, D. M. 2004, AJ, 127, 460 Harrison, T. E., Osborne, H. L., & Howell, S. B. 2005b, AJ, 129, 2400 Hubeny, I. 1988, Comput. Phys. Commun., 52, 103 Hubeny, I., & Lanz, T. 1995, ApJ, 439, 875 Knigge, C. 2006, MNRAS, 373, 484 Ko, Y.-K., Lee, Y. P., Schlegel, E. M., & Kallman, T. R. 1996, ApJ, 457, 363 Kromer, M., Nagel, T., & Werner, K. 2007, A&A, 475, 301 Liu, F. K., Meyer, F., Meyer-Hofmeister, E., & Burwitz, V. 2008, A&A, 483, 231 Long, K. S., Blair, W. P., Bowers, C. W., Davidsen, A. F., Kriss, G. A., Sion, E. M., & Hubeny, I. 1993, ApJ, 405, 327 Long, K. S., Blair, W. P., Hubeny, I., & Raymond, J. C. 1996, ApJ, 466, 964 Long, K. S., Brammer, G., & Froning, C. S. 2006, ApJ, 648, 541 Long, K. S., Froning, C. S., Knigge, C., Blair, W. P., Kallman, T. R., & Ko, Y.-K. 2005, ApJ, 630, 511 Marks, P. B., & Sarna, M. J. 1998, MNRAS, 301, 699 Mauche, C. W., Lee, Y. P., & Kallman, T. R. 1997, ApJ, 477, 832 Mennickent, R. E., Diaz, M. P., & Tappert, C. 2004, MNRAS, 347, 1180 Merritt, J., Night, C., & Sion, E. M. 2007, PASP, 119, 251 Meyer, F., Liu, B. F., & Meyer-Hofmeister, E. 2000, A&A, 361, 175 Mineshige, S., Liu, B., Meyer, F., & Meyer-Hofmeister, E. 1998, PASJ, 50, L5 Mohanty, P., & Schlegel, E. M. 1995, ApJ, 449, 330 Moos, H. W., et al. 2000, ApJ, 538, L1 Osaki, Y. 1989, PASJ, 41, 1005 Pandel, D., C´ordova, F. A., & Howell, S. B. 2003, MNRAS, 346, 1231 Paquette, C., Pelletier, C., Fontaine, G., & Michaud, G. 1986, ApJS, 61, 197 Patterson, J. 1998, PASP, 110, 1132 Patterson, J., Richman, H., Kemp, J., & Mukai, K. 1998, PASP, 110, 403 Piro, A. L., Arras, P., & Bildsten, L. 2005, ApJ, 628, 401 Polidan, R. S., Mauche, C. W., & Wade, R. A. 1990, ApJ, 356, 211 Press, W. H., Teukolsky, S. A., Vetterling, W. T., & Flannery, B. P. 2007, Numerical Recipes: The Art of Scientific Computing (3rd ed.; Cambridge: Cambridge Univ. Press), 807 Rogoziecki, P., & Schwarzenberg-Czerny, A. 2001, MNRAS, 323, 850 Sahnow, D. J., et al. 2000, ApJ, 538, L7 Schoembs, R., & Vogt, N. 1981, A&A, 97, 185 Schreiber, M. R., Hameury, J.-M., & Lasota, J.-P. 2004, A&A, 427, 621 Schwarzenberg-Czerny, A. 1996, ApJ, 460, L107 Shaviv, G., & Wehrse, R. 1986, A&A, 159, L5 Sion, E. M. 1995, ApJ, 438, 876 Sion, E. M., Cheng, F. H., G¨ansicke, B. T., & Szkody, P. 2004, ApJ, 614, L61 Sion, E. M., Cheng, F. H., Sparks, W. M., Szkody, P., Huang, M., & Hubeny, I. 1997, ApJ, 480, L17 Sion, E. M., Cheng, F.-H., Szkody, P., G¨ansicke, B., Sparks, W. M., & Hubeny, I. 2001, ApJ, 561, L127 Smith, A. J., Haswell, C. A., & Hynes, R. I. 2006, MNRAS, 369, 1537 Tappert, C., G¨ansicke, B. T., Schmidtobreick, L., Mennickent, R. E., & Navarrete, F. P. 2007, A&A, 475, 575 Townsley, D. M., & Bildsten, L. 2003, ApJ, 596, L227 van Amerongen, S., Damen, E., Groot, M., Kraakman, H., & van Paradijs, J. 1987, MNRAS, 225, 93 van der Woerd, H., & Heise, J. 1987, MNRAS, 225, 141 van der Woerd, H., van der Klis, M., van Paradijs, J., Beuermann, K., & Motch, C. 1988, ApJ, 330, 911 Vogt, N. 1983, A&A, 118, 95 Warner, B. 1987, MNRAS, 227, 23 Warner, B. 1995, Cataclysmic Variable Stars (Cambridge Astrophysics Series; Cambridge: Cambridge Univ. Press), 81 Williams, R. E. 1980, ApJ, 235, 939
URI:	http://wrap.warwick.ac.uk/id/eprint/27951

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