publication . Preprint . 2008

Two extremely luminous WN stars in the Galactic center with circumstellar emission from dust and gas

Barniske, A.; Oskinova, L. M.; Hamann, W. -R.;
Open Access English
  • Published: 16 Jul 2008
Abstract
We study relatively isolated massive WN-type stars in the Galactic center. The K-band spectra of WR102ka and WR102c are exploited to infer the stellar parameters and to compute synthetic stellar spectra using the Potsdam Wolf-Rayet (PoWR) model atmosphere code. These models are combined with dust-shell models for analyzing the Spitzer IRS spectra of these objects. Archival IR images complement the interpretation. We report that WR102ka and WR102c are among the most luminous stars in the Milky Way. The mid-IR continua for both objects are dominated by dust emission. For the first time we report the presence of dust in the close vicinity of WN stars. Also for the ...
Subjects
arxiv: Astrophysics::Galaxy AstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysics::Earth and Planetary AstrophysicsAstrophysics::Solar and Stellar Astrophysics
free text keywords: Astrophysics
Download from

Burton, M., Hollenbach, D.J., & Tielens, A.G.G.M. 1990, ApJ, 365, 620 Clark, J. S., Larionov, V. M., & Arkharov, A. 2005, A&A, 435, 239 Cohen, M., & Green, A.J. 2001, MNRAS, 325, 531 Cotera, A.S., Simpson, J.P., Erickson, E.F., et al. 2000, ApJS, 129, 123 Crowther, P.A., Hillier,D.J., & Smith, L.J. 1995, A&A, 293, 172 Crowther, P.A., Morris, P.W., & Smith, J.D. 2006, ApJ, 636, 1033 Dopita, M.A., Groves, B.A., Fischera, J., et al. 2005, ApJ, 619, 755 Dopita, M.A., Fischera, J., Crowley, O., et al. 2006, ApJ, 639, 788 Draine, B.T., 2004, in Origin and Evolution of the Elements, Carnegie Observatories Centennial Symposia, ed. A. McWilliam & M. Rauch, 317 Draine, B.T., & Lee, H.M. 1984, ApJ, 285, 89 Fazio G.G., Hora, J.L., Allen, L.E., et al. 2004, ApJ Suppl., 154, 10 Figer, D.F., Najarro, F., Morris, M., et al. 1998, ApJ, 506, 384 Figer, D.F., McLean, I.S., & Morris, M. 1999a, ApJ, 514, 202 Figer, D.F., Kim, S.S., Morris, M., et al. 1999b, ApJ, 525, 750 Freyer, T., Hensler, G., & Yorke, H. W. 2003, ApJ, 594, 888 Fullerton, A.W., Massa, D.L., & Prinja, R.K. 2006, ApJ, 637, 1025 Gra¨fener, G., & Hamann, W.-R. 2008, A&A, 482, 945 Groh, J.H., Damineli, A., Teodoro, M., & Barbosa, C.L. 2006, A&A, 457, 591 Hadfield, L.J., van Dyk, S.D., Morris, P.W., et al. 2007, MNRAS, 376, 248 Hamann, W.-R., Du¨nnebeil, G., Koesterke, L., Schmutz, W., & Wessolowski, U. 1991, A&A, 249, 443

Hamann, W.-R., & Koesterke, L. 1998, A&A, 333, 251 Hamann, W.-R., & Gra¨fener G. 2004, A&A, 427, 697 Hamann, W.-R., Gra¨fener G., & Liermann A. 2006, A&A, 457, 1015 Herbst, T.M., Beckwith, S.V.W., Glindemann, A., et al. 1996, ApJ, 111, 2403 Homeier, N.L., Blum, R.D., Pasquali, A., Conti, P.S., & Damineli, A. 2003, A&A, 408, 153

Houck, J.R., Roellig, T.L., van Cleve, J., et al. 2004, ApJS, 154, 18 Ivezic´, Z., & Elitzur, M. 1997, MNRAS, 287, 799 Kaufman, M.J., Wolfire, M.G., & Hollenbach, D.J. 2006, ApJ, 644, 283 Krabbe, A., Genzel, R., Eckart, A., et al. 1995, ApJ, 447, L95 Lamers, H.J.G.L.M., & Fitzpatrick, E.L. 1988, ApJ, 324, 279 Lamers, H.J.G.L.M., & Cassinelli, J.P. 1999, Introduction to Stellar Winds, ed. H.J.G.L.M. Lamers, & J.P. Cassinelli, ISBN 0521593980 (Cambridge, UK: Cambridge University Press), 49

Lang, C.C., Goss, W.M., & Wood, D.O.S. 1997, ApJ, 474, 275 Langer, N., Hamann, W.-R., Lennon, M., Najarro, F., Puls, J., & Pauldrach, A. 1994, A&A, 290, 819

Li, A. 2005, AIPC, 761, 123

Maeder, A., Meynet, G., Ekstro¨m, S., Hirschi, R., & Georgy, C. 2008, astroph/0801.4712

Meynet, G., & Maeder, A., 2003, A&A, 404, 975 Martins, F., Genzel, R., Hillier, D.J., et al. 2007, A&A, 468, 233 Mathis, J.S., Rumpl, W., & Nordsieck, K.H. 1977, ApJ, 217, 425 Moneti, A., Stolovy, S., Bommart, J.A.D.L, et al. 2001, A&A, 366, 106 Morris, P.W., Eenens, P.R.J, Hanson, M.M., et al. 1996, ApJ, 470, 597 Najarro, F. 2006, Journal of Physics Conference Series, 54, 224 Oskinova, L.M., Hamann, W.-R., & Feldmeier, A. 2007, A&A, 476, 1331 Parmar, P.S., Lacy, J.H., & Achtermann, J.M. 1991, ApJ, 372, 25 Price, S.D., Egan, M.P., Carey, S.J., Mizuno, D.R., & Kuchar, T.A. 2001, AJ, 121, 2819

Rauw, G., Vreux, J.-M., Gosset, E., et al. 1996, A&A, 306, 771 Reach, W., Megeath, S.T., Cohen, M., et al. 2005, PASP, 117, 978 Reid, M.J., ARA&A, 31, 345

Ram´ırez, S.V., Arendt, R.G., Sellgren, K., et al. 2008, ApJS, 175, 147 Rodriguez-Ferna´ndez, N.J., Martn-Pintado, J., & de Vicente, P. 2001, A&A, 377, 631

Schultheis, M., Ganesh, S., Simon, G., et al. 1999, A&A, 349, L69 Serabyn, E., Shupe, D., & Figer, D.F., 1998, Nature, 394, 448 Simpson, J. P., Colgan, S.W.J., Cotera, A.S., et al. 1997, ApJ, 487, 689 Simpson, J., Colgan, S.W.J., Cotera, A.S., et al. 2007, ApJ, 670, 1115 Smith, N. 2002, MNRAS, 337, 1252

Smith, N., & Conti, P.S. 2008, ApJ, 679, 1467 Stolovy, S., Ramirez, S., Arendt, R.G., et al. 2006, JPhCS, 54, 176 Stothers, R.B., & Chin, C.W. 2000, ApJ, 540, 1041 Turner, J., Kirby-Docken, K., & Dalgarno, A. 1977, ApJS, 35, 281 van Genderen, A.M. 2001, A&A, 366, 508

Voors, R.H.M., Waters, L.B.F.M., de Koter, A., et al. 2000, A&A, 356, 501 Yusef-Zadeh, F., & Morris, M. 1987, ApJ, 320, 545

Powered by OpenAIRE Open Research Graph
Any information missing or wrong?Report an Issue