Publication: X-ray variability of sigma Orionis young stars as observed with rosar
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2009-06
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We used the Aladin Virtual Observatory tool and High Resolution Imager ROSAT archival data to search for X-ray variability in scale of days in 23 young stars in the sigma Orionis cluster and a background galaxy. Five stars displayed unambiguous flares and had probabilities p(var) >> 99% of being actual variables. Two of the detected flares were violent and long lasting, with maximum duration of six days and amplitude of eight times above the quiescent level. We classified another four stars as possible X-ray variables, including the binary system formed by the B2Vp star sigma Ori E and its close late-type companion. This makes a minimum frequency of high-amplitude X-ray variability in excess of a day of 39% among sigma Orionis stars. The incidence of this kind of X-ray variability seems to be lower among classical T Tauri stars with mid-infrared flux excesses than among fast-rotating, disk-less young stars.
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© 2009. The American Astronomical Society. All rights reserved. We are grateful to the anonymous referee, J. F. Albacete Colombo, and J. Sánz Forcada for helpful discussion and advice. Financial support was provided by the Universidad Complutense de Madrid, the Comunidad Autónoma de Madrid, the Spanish Ministerio Educación y Ciencia, and the European Social Fund under grants: AyA200502750, AyA2005-04286, AyA2005-24102-E, AyA2008-06423C03-03, AyA2008-00695, PRICITS-0505/ESP-0237, and CSD2006-0070. This research has made use of the SIMBAD, operated at Centre de Données astronomiques de Strasbourg, France, and the NASA's Astrophysics Data System.
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Albacete Colombo, J. F., Caramazza, M., Flaccomio, E., Micela, G., & Sciortino, S. 2007a, A&A, 474, 495
Albacete Colombo, J. F., Flaccomio, E., Micela, G., Sciortino, S., & Damiani, F. 2007b, A&A, 464, 211
Alcalá, J. M., et al. 1996, A&AS, 119, 7
Alcalá, J. M., et al. 2000, A&A, 353, 186
Berghöfer, T. W., & Schmitt, J. H. M. M. 1994, A&A, 290, 435
Bonnarel, F., et al. 2000, A&AS, 143, 33
Bouy, H., et al. 2009, A&A, 493, 931
Burgasser, A. J., et al. 2003, ApJ, 586, 512
Caballero, J. A. 2005, AN, 326, 1007
Caballero, J. A. 2006, Ph.D. thesis, Univ. de La Laguna (arXiv: 0810.2033)
Caballero, J. A. 2007a, A&A, 466, 917
Caballero, J. A. 2007b, AN, 328, 917
Caballero, J. A. 2008a, MNRAS, 383, 375
Caballero, J. A. 2008b, A&A, 478, 667
Caballero, J. A. 2009, Multi-wavelength Astronomy and Virtual Observatory Workshop, in press (arXiv:0901.2566)
Caballero, J. A., et al. 2008, A&A, 491, 515
Crespo Chacón, I., López Santiago, J., Reale, F., & Micela, G. 2009, in AIP Conf. Proc. 1094, 15th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, ed. E. Stempels (Melville, NY: AIP), 584
Drake, S. A., Linsky, J. L., Schmitt, J. H. M. M., & Rosso, C. 1994, ApJ, 420, 387
Elvis, M., et al. 1994, ApJS, 95, 1
Favata, F., et al. 2005, ApJS, 160, 469
Feigelson, E. D., & Montmerle, T. 1999, ARA&A, 37, 363
Feigelson, E. D., Broos, P., Gaffney, J. A., III, Garmire, G., Hillenbrand, L. A., Pravdo, S. H., Townsley, L., & Tsuboi, Y. 2002, ApJ, 574, 258
Franciosini, E., Pallavicini, R., & Sánz Forcada, J. 2006, A&A, 446, 501
Franciosini, E., et al. 2007, A&A, 468, 485 Fuhrmeister, B., & Schmitt, J. H. M. M. 2003, A&A, 403, 247
Gagné, M., Skinner, S. L., & Daniel, K. J. 2004, ApJ, 613, 393
Gatti, T., Natta, A., Randich, S., Testi, L., & Sacco, G. 2008, A&A, 481, 423
Giardino, G., et al. 2006, A&A, 453, 241
González Hernández, J. I., et al. 2008, A&A, 490, 1135
Groote, D., & Hunger, K. 1982, A&A, 116, 64
Groote, D., & Schmitt, J. H. M. M. 2004, A&A, 418, 235
Güdel, M. 2004, A&AR, 12, 71
Haro, G., & Moreno, A. 1953, Bol. Obs. Tonantz. Tacub. Part No. 1, 7, 11
Harris, D. E., et al. 1994, VizieR On-line Data Catalog: IX/13. Originally published in Einstein Observatory catalog of IPC X-ray sources SAO HEAD CD-ROM Series I (Einstein), Nos. 18–36
Hernández, J., et al. 2007, ApJ, 662, 1067
Jeffries, R. D., Maxted, P. F. L., Oliveira, J. M., & Naylor, T. 2006, MNRAS, 371, L6
Kinnunen, T., & Skiff, B. A. 2000, VizieR On-line Data Catalog: IV/23. Originally published in T. Kinnunen & B. A. Skiff, 2002 IBVS, 4861, 1
Landstreet, J. D., & Borra, E. F. 1978, ApJ, 224, L5
López Santiago, J., & Caballero, J. A. 2008, A&A, 491, 961
Luhman, K. L., Hernández, J., Downes, J. J., Hartmann, L., & Briceño, C. 2008, ApJ, 688, 362
Marino, A., Micela, G., & Peres, G. 2000, A&A, 353, 177
Marino, A., Micela, G., Peres, G., Pilliteri, I., & Sciortino, S. 2005, A&A, 430, 287
Marino, A., Micela, G., Peres, G., & Sciortino, S. 2002, A&A, 383, 210
Moran, E. C., Helfand, D. J., Becker, R. H., & White, R. L. 1996, ApJ, 461, 127
Nandra, K., & Pounds, K. A. 1994, MNRAS, 268, 405
Neuhäuser, R., Sterzik, M. F., Schmitt, J. H. M. M., Wichmann, R., & Krautter, J. 1995, A&A, 297, 391
Osten, R. A., & Brown, A. 1999, ApJ, 515, 746
Poletto, G., Pallavicini, R., & Kopp, R. A. 1988, A&A, 201, 93
Preibisch, T., & Zinnecker, H. 2002, AJ, 123, 1613
Preibisch, T., et al. 2005, ApJS, 160, 410
Prosser, C. F., Randich, S., Stauffor, J. R., Schmitt, J. H. M. M., & Simon, T. 1996, AJ, 112, 1570
Rees, M. J. 1984, ARA&A, 22, 471
ROSAT Consortium 2000, VizieR On-line Data Catalog: IX/28A. Originally published in ROSAT NEWS No. 71 (Max-Planck Institut fuer extraterrestrische Physik, Goddard Space Flight Center, Smithsonian Astrophysical Observatory Leicester University, Astrophysikalisches Institut Potsdam)
Sacco, G. G., Franciosini, E., Randich, S., & Pallavicini, R. 2008, A&A, 488, 167
Sanz Forcada, J., Brickhouse, N. S., & Dupree, A. K. 2002, ApJ, 570, 799
Sanz Forcada, J., Franciosini, E., & Pallavicini, R. 2004, A&A, 421, 715
Sherry, W. H., Walter, F. M., & Wolk, S. J. 2004, AJ, 128, 2316
Sherry, W. H., Walter, F. M., Wolk, S. J., & Adams, N. R. 2008, AJ, 135, 1616
Skinner, S. L., et al. 2008, ApJ, 683, 796
Stelzer, B., Neuhäeuser, R., & Hambaryan, V. 2000, A&A, 356, 949
Stelzer, B., et al. 2007, A&A, 468, 463
Townsend, R. H. D., Owocki, S. P., & Groote, D. 2005, ApJ, 630, L81
Townsend, R. H. D., Owocki, S. P., & ud-Doula, A. 2007, MNRAS, 382, 139
ud-Doula, A., Townsend, R. H. D., & Owocki, S. P. 2006, ApJ, 640, L191
Walter, F. M., Sherry, W. H., Wolk, S. J., & Adams, N. R. 2008, in ASP Monograph, Vol. 4, Handbook of Star Forming Regions, Volume I: The Northern Sky, ed. Bo Reipurth (San Francisco, CA: ASP), 732
Watson, M. G., et al. 2003, Astron. Nachr., 324, 89
Watson, M. G., et al. 2009, A&A, 493, 339
Wolk, S. J. 1996, Ph.D. thesis, State Univ. of New York at Stony Brook
Wolk, S. J., Harnden, F. R. Jr., Flaccomio, E., Micela, G., Favata, F., Shang, H., & Feigelson, E. D. 2005, ApJS, 160, 423