Artículo
Abstract:
We present a Chandra observation of the recurrent nova U Scorpii, done with the High Resolution camera-S (HRC-S) detector and the Low Energy Transmission Grating (LETG) on day 18 after the observed visual maximum of 2010, and compare it with XMM-Newton observations obtained on days 23 and 35 after maximum. The total absorbed flux was in the range 2.2-2.6 × 10 -11 erg cm -2 s -1 , corresponding to unabsorbed luminosity 7-8.5 × 10 36 ×(d/12 kpc) 2 for N(H) = 2-2.7 × 10 21 cm -2 . On day 18, 70 per cent of the soft X-tray flux was in a continuum typical of a very hot white dwarf (WD) atmosphere, which accounted for about 80 per cent of the flux on days 23 and 35. In addition, all spectra display very broad emission lines, due to higher ionization stages at later times. With Chandra we observed apparent P Cygni profiles. We find that these peculiar profiles are not due to blueshifted absorption and redshifted emission in photoionized ejecta, like the optical P Cyg of novae, but they are rather a superposition of WD atmospheric absorption features reflected by the already discovered Thomson scattering corona, and emission lines due to collisional ionization in condensations in the ejecta. On days 23 and 35, the absorption components were no longer measurable, having lost the initial large blueshift that displaced them from the core of the broad emission lines. We interpret this as an indication that mass-loss ceased between day 18 and day 23. On day 35, the emission line spectrum became very complex, with several different components. Model atmospheres indicate that theWD atmospheric temperature was about 730 000 K on day 18 and reached 900 000-1000 000 K on day 35. This peak temperature is consistent with a WD mass of at least 1.3 M⊙. © 2012 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
Registro:
| Documento: | Artículo |
| Título: | Thomson scattering and collisional ionization in the X-ray grating spectra of the recurrent nova U Scorpii |
| Autor: | Orio, M.; Behar, E.; Gallagher, J.; Bianchini, A.; Chiosi, E.; Luna, G.J.M.; Nelson, T.; Rauch, T.; Schaefer, B.E.; Tofflemire, B. |
| Filiación: | INAF - Osservatorio di Padova, Vicolo dell-Osservatorio 5, I-35122 Padova, Italy Department of Astronomy, University of Wisconsin, 475 N. Charter Str., Madison, WI 53704, United States Department of Physics, Technion, Haifa 32000, Israel Astronomy Department, Padova University, Vicolo dell' Osservatorio 3, I-35122 Padova, Italy Instituto de Astronom'ia y Fisica del Espacio (IAFE/Conicet), CC67, Suc. 28 C1428ZAA CABA, Argentina School of Physics and Astronomy, University of Minnesota, 116 Church St SE, Minneapolis, MN 55455, United States Institute for Astronomy and Astrophysics, Kepler Center for Astro and Particle Physics, Eberhard Karls University, Sand 1, D-72076 Tubingen, Germany Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, United States |
| Palabras clave: | Binaries-X-rays; Cataclysmic variables-white dwarfs-stars; Individual; Stars; U Scorpii; U Scorpii-novae; Winds-outflows-X-rays |
| Año: | 2013 |
| Volumen: | 429 |
| Número: | 2 |
| Página de inicio: | 1342 |
| Página de fin: | 1353 |
| DOI: | http://dx.doi.org/10.1093/mnras/sts421 |
| Título revista: | Monthly Notices of the Royal Astronomical Society |
| Título revista abreviado: | Mon. Not. R. Astron. Soc. |
| ISSN: | 00358711 |
| CODEN: | MNRAA |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v429_n2_p1342_Orio |
Referencias:
- Anupama, G.C., Dewangan, G.C., (2000) AJ, 119, p. 1359
- Balman, S., Krautter, J., Ögelman, H., (1998) ApJ, 499, p. 345
- Barlow, M.J., (1981) MNRAS, 195, p. 61
- Behar, E., Leutenegger, M., Doron, R., G̈udel, M., Feldman, U., Audard, M., Kahn, S.M., (2004) ApJ, 612, pp. L65
- Brinkman, A.C., (2000) ApJ, 530, pp. L111
- Cash, W., (1979) ApJ, 228, p. 939
- Chen, H., Beiersdorfer, P., Heeter, L.A., Liedahl, D.A., Naranjo-Rivera, K.L., Tr̈abert, E., Gu, M.F., Lepson, J.K., (2004) ApJ, 611, p. 298
- Drake, J.J., (2003) ApJ, 584, p. 548
- D̈urbeck, H.W., D̈ummler, R., Seitter, W.C., Leibowitz, E.M., Shara, M.M., (2003) The Messenger, 71, p. 19
- Gabriel, A.H., Jordan, C., (1969) MNRAS, 145, p. 241
- Gallagher, J.S., Anderson, C.M., (1976) ApJ, 203, p. 625
- Hachisu, I., Kato, M., (2010) ApJ, 709, p. 680
- Kahabka, P., Hartmann, H.W., Parmar, A.N., Neguerela, I., (1999) A&A, 347, pp. L43
- Kinkhabwala, A., (2002) ApJ, 575, p. 732
- Lloyd, H.M., O'Brien, T.J., Bode, M.F., Predehl, P., Schmitt, J.H.M.M., Truemper, J., Watson, M.G., Pounds, K.A., (1992) Nat, 350, p. 222
- Mason, E., Ederoclite, A., Williams, R.E., Della Valle, M., Setiawan, J., (2012) A&A, 544, p. 149
- Maxwell, M.P., (2012) MNRAS, 419, p. 1465
- Mukai, K., Kinkhabwala, A., Peterson, J.R., Kahn, S.M., Paerels, F., (2003) ApJ, 582, p. 184
- Mukai, K., Orio, M., (2005) ApJ, 622, p. 602
- Neff, J.S., Smith, V.V., Katelsen, D.A., (1978) ApJS, 38, p. 98
- Nelson, T., Orio, M., Cassinelli, J.P., Still, M., Leibowitz, E., Mucciarelli, P., (2008) ApJ, 673, p. 1067
- Ness, J.-U., (2001) A&A, 367, p. 282
- Ness, J.-U., Brickhouse, N.S., Drake, J.J., Huenemoerder, D.P., (2003) ApJ, 598, p. 1289
- Ness, J.-U., (2011) Presentations of a Conference held in Berlin, , 27-30 June 2011, The X-ray Universe 2011
- Ness, J.-U., (2011) ApJ, 733, p. 70
- Ness, J.-U., (2012) ApJ, 745, p. 43
- O'Brien, T.J., Lloyd, H.M., (1994) MNRAS, 271, p. 155
- Orio, M., Nelson, T., Gallagher, J., (2011) HEAD Meeting, , 12.11.06
- Orio, M., Binary Paths to Type Ia Supernovae Explosions (2012) Di Stefano R., Moe M., Orio M., eds, Cambridge Univ. Press, Cambridge, in press
- Orio, M., Hartmann, W., Still, M., Greiner, J., (2003) ApJ, 594, p. 435
- Orio, M., Ebisawa, K., Heise, J., Hartmann, J., (2004) Revista Mexicana de Astronomia y Astrofisica, 610, p. 194
- Pinto, C., (2012) A&A, 543, p. 134
- Rauch, T., Orio, M., Gonzales-Riestra, R., Nelson, T., Still, M., Werner, K., Wilms, J., (2010) ApJ, 717, p. 363
- Schaefer, B.E., (1990) ApJ, 355, pp. L39
- Schaefer, B.E., (2011) ApJ, 742, p. 112
- Schaefer, B.E., Ringwald, F.A., (1995) ApJ, 447, pp. L45
- Schaefer, B., (2010) AJ, 140, p. 925
- Schaefer, B., (2011) ApJ, 472, p. 113
- Starrfield, S., Sparks, W.M., Shaviv, G., (1988) ApJ, 325, pp. L35
- Thoroughgood, T.D., (2001) MNRAS, 327, p. 1323
- Tofflemire, B., Orio, M., (2012) preprint
- Yamanaka, M., (2010) PASJ, 62, pp. L37
- Yaron, O., Prialnik, D., Shara, M.M., Kovetz, A., (2005) ApJ, 623, p. 398
Citas:
---------- APA ----------
Orio, M., Behar, E., Gallagher, J., Bianchini, A., Chiosi, E., Luna, G.J.M., Nelson, T.,..., Tofflemire, B. (2013) . Thomson scattering and collisional ionization in the X-ray grating spectra of the recurrent nova U Scorpii. Monthly Notices of the Royal Astronomical Society, 429(2), 1342-1353.http://dx.doi.org/10.1093/mnras/sts421
---------- CHICAGO ----------
Orio, M., Behar, E., Gallagher, J., Bianchini, A., Chiosi, E., Luna, G.J.M., et al. "Thomson scattering and collisional ionization in the X-ray grating spectra of the recurrent nova U Scorpii" . Monthly Notices of the Royal Astronomical Society 429, no. 2 (2013) : 1342-1353.http://dx.doi.org/10.1093/mnras/sts421
---------- MLA ----------
Orio, M., Behar, E., Gallagher, J., Bianchini, A., Chiosi, E., Luna, G.J.M., et al. "Thomson scattering and collisional ionization in the X-ray grating spectra of the recurrent nova U Scorpii" . Monthly Notices of the Royal Astronomical Society, vol. 429, no. 2, 2013, pp. 1342-1353.http://dx.doi.org/10.1093/mnras/sts421
---------- VANCOUVER ----------
Orio, M., Behar, E., Gallagher, J., Bianchini, A., Chiosi, E., Luna, G.J.M., et al. Thomson scattering and collisional ionization in the X-ray grating spectra of the recurrent nova U Scorpii. Mon. Not. R. Astron. Soc. 2013;429(2):1342-1353.http://dx.doi.org/10.1093/mnras/sts421
