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Moffat, A.F.J.; Marchenko, S.V.; Bartzakos, P.; Nlemela, V.S.; Cerruti, M.A.; Magalhães, A.M.; Balona, L.; St-Louis, N.; Seggewiss, W.; Lamontagne, R. "The luminous eclipsing SMC OB + WN binary HD 5980 before and during the recent LBV-like outburst: An extreme case of colliding winds" (1998) Astrophysical Journal. 497(2 PART I):896-911
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Abstract:

The 1994 LBV-(luminous blue variable)like outburst of one of the luminous, hot components of the binary HD 5980 made it the brightest star in the Small Magellanic Cloud for an interval of 5 months. The most intriguing question to arise from this event is the following: Why did the HD 5980 spectrum change from an H-poor WN3 with veiled OB absorption lines about 20 yr ago to an H-rich WN11 without central absorption lines during the outburst? In an attempt to answer this apparent enigma, we present and analyze new phase-dependent spectroscopic, polarimetric, and light-curve observations. Together with other published data, these new observations allow us to improve the orbital parameters considerably, except for the radial velocity amplitudes and hence the masses, which are only roughly constrained. Especially important in HD 5980 is the strong collision of the two nearly equal pre-outburst winds. The emission-line spectrum generated by the collision tends to mask the underlying line spectra of both components when the system is relatively quiescent. We argue that the pre-erupting system consists of a very luminous but moderately massive H-rich O type supergiant, possibly with emission lines, and a low-mass, H-poor, relatively faint WN companion, whose lines are mostly drowned out by wind collision emission, the spectrum of which largely imitates that of a WNE star. It was the O supergiant that erupted in a normal way as an H-rich, visually bright WN11 star. In this way, the need for peculiar evolutionary scenarios (e.g., rapid evolution from a faint, low-mass, H-poor WNE star to a luminous, H-rich WNL star) is avoided. © 1998. The American Astronomical Society. All rights reserved.

Registro:

Documento: Artículo
Título:The luminous eclipsing SMC OB + WN binary HD 5980 before and during the recent LBV-like outburst: An extreme case of colliding winds
Autor:Moffat, A.F.J.; Marchenko, S.V.; Bartzakos, P.; Nlemela, V.S.; Cerruti, M.A.; Magalhães, A.M.; Balona, L.; St-Louis, N.; Seggewiss, W.; Lamontagne, R.
Filiación:Département de Physique, Université de Montréal, C.P. 6128, Suce. Centre-Ville, Montréal, Que., Canada
Observatoire du Mont Mégantic, Argentina
Facultad de Ciencias Astronómicas y Geofisicas, Universidad Nacional de la Plata, 1900 La Plata, Argentina
Member of the Carrera del Investigador Cientifico, CIC, Prov. de Buenos Aires, Argentina
Instituto de Astronomia y Fisica del Espacio, CC 67, Sue. 28, 1428 Buenos Aires, Argentina
Carrera del Investigador Cientifico, CONICET, Argentina
Instituto Astronomico e Geofisico, Univ. de Sao Paulo, Caixa Postal 9638, 01065-970 Sao Paulo, SP, Brazil
South African Astronomical Observatory, P.O. Box 9, Observatory 7935, Cape Town, South Africa
Observatorium Hoher List, Universitätssternwarte Bonn, D-54550 Daun, Germany
Palabras clave:Stars: Binaries: Eclipsing; Stars: Individual: HD 5980; Stars: Mass loss; Stars: Variables; Stars: Wolf-Ravet
Año:1998
Volumen:497
Número:2 PART I
Página de inicio:896
Página de fin:911
DOI: http://dx.doi.org/10.1086/305475
Título revista:Astrophysical Journal
Título revista abreviado:Astrophys. J.
ISSN:0004637X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v497_n2PARTI_p896_Moffat

Referencias:

  • Antokhin, I.I., Marchenko, S.V., Moffat, A.F.J., (1995) IAU Symp., 163, p. 520. , Wolf-Rayet Stars: Binaries, Colliding Winds, Evolution, ed. K. A. van der Hucht & P. M. Williams (Dordrecht: Kluwer)
  • Antokhin, I.I., (1997), in preparation; Azzopardi, M., Breysacher, J., (1979) A&A, 75, p. 120
  • Barba, R.H., (1996) Rev. Mexicana Astron. Astrofis., 5, p. 85
  • Barba, R.H., Niemela, V.S., (1995) IAU Symp., 163, p. 254. , Wolf-Rayet Stars: Binaries, Colliding Winds, Evolution, ed. K. A. van der Hucht & P. M. Williams (Dordrecht: Kluwer)
  • Barba, R.H., Niemela, V.S., Baume, G., Vazquez, R.A., (1995) ApJ, 446, p. 123
  • Barba, R.H., Niemela, V.S., Morrell, N.I., (1997) ASP Conf. Ser., 120, p. 238. , Luminous Blue Variables: Massive Stars in Transition, ed. A. Nota & H. J. G. L. M. Lamers (San Francisco: ASP)
  • Bartzakos, P., Moffat, A.F.J., Niemela, V.S., (1995) IAU Symp., 163, p. 406. , Wolf-Rayet Stars: Binaries, Colliding Winds, Evolution, ed. K. A. van der Hucht & P. M. Williams (Dordrecht: Kluwer)
  • Bartzakos, P., (1997), in preparation; Bateson, F.M., Jones, A.F., (1994) Publ. Variable Star Sec. R. Astron. Soc. New Zealand, p. 19
  • Breysacher, J., Moffat, A.F.J., Niemela, V.S., (1982) ApJ, 257, p. 116. , BMN
  • Breysacher, J., Perrier, C., (1980) A&A, 90, p. 207. , BP80
  • Breysacher, J., Ferner, C., (1991) IAU Symp., 143, p. 229. , Wolf-Rayet Stars and Interrelations with Other Stars, ed. K. A. van der Hucht & B. Hidayat (Dordrecht : Kluwer), BP91
  • Breysacher, J., Westerlund, B.E., (1978) A&A, 67, p. 261
  • Brown, J., Aspin, C., Simmons, J.F.L., McLean, I.S., (1982) MNRAS, 198, p. 787
  • Conti, P.S., Leep, E.M., Perry, D.N., (1983) ApJ, 268, p. 228
  • Conti, P.S., Massey, P., Garmany, C.D., (1989) ApJ, 341, p. 113
  • Crowther, P.A., Smith, L.J., Hillier, D.J., Schmutz, W., (1995) A&A, 293, p. 427
  • Drissen, L., Robert, C., Lamontagne, R., Moffat, A.F.J., St-Louis, N., Van Weeren, N., Van Genderen, A.M., (1989) ApJ, 343, p. 426
  • Eichler, D., Usov, V., (1993) ApJ, 402, p. 271
  • Feast, M.W., Thackeray, A.D., Wesselink, A.J., (1960) MNRAS, 121, p. 337
  • Heydari-Malayeri, M., Rauw, G., Esslinger, O., Beuzit, J.-L., (1997) A&A, 322, p. 554
  • Hill, G., (1997), in preparation; Hillier, D.J., (1988) ApJ, 327, p. 822
  • Hutchings, J.B., (1970) MNRAS, 147, p. 161
  • Hutchings, J.B., Crampton, D., Cowley, A.P., Thompson, I.B., (1984) PASP, 96, p. 811
  • Kallrath, J., (1991) MNRAS, 248, p. 653
  • Koenigsberger, K., Auer, L.H., (1985) ApJ, 297, p. 255
  • Koenigsberger, K., Moffat, A.F.J., St-Louis, N., Auer, L.H., Drissen, L., Seggewiss, W., (1994) ApJ, 436, p. 301
  • Koenigsberger, G., Moreno, E., (1997) ASP Conf. Ser., 120, p. 233. , Luminous Blue Variables: Massive Stars in Transition, ed. A. Nota & H. J. G. L. M. Lamers (San Francisco: ASP)
  • Koenigsberger, G., Guinan, E., Auer, L., Georgjev, L., (1995) ApJ, 452, pp. L107
  • Langer, N., Hamann, W.-R., Lennon, M., (1994) A&A, 290, p. 819
  • Lewis, D., Moffat, A.F.J., Matthews, J.M., Robert, C., Marchenko, S.V., (1993) ApJ, 405, p. 312
  • Lührs, S., (1991), Ph.D. thesis, Univ. Münster; (1995) IAU Symp., 163, p. 416
  • Maeder, A., Conti, P.S., (1994) ARA&A, 32, p. 227
  • Magalhães, A.M., Benedetti, E., Roland, E., (1984) PASP, 96, p. 383
  • Marchenko, S.V., Moffat, A.F.J., Eenens, P.R.J., Cardona, O., Echevarria, J., Hervieux, Y., (1997) ApJ, 485. , in press
  • Marchenko, S.V., Moffat, A.F.J., Eenens, P.R.J., Hill, G.M., Grandchamps, A., (1995) ApJ, 450, p. 811
  • Marchenko, S.V., Moffat, A.F.J., Koenigsberger, G., (1994) ApJ, 422, p. 810
  • Massey, P., Parker, J.W., Garmany, C.D., (1989) AJ, 98, p. 1305
  • Menzies, J.W., Consins, A.W.J., Banneid, R.M., Laing, J.D., (1989) SAAO Circ., 13, p. 1
  • Moffat, A.F.J., (1982) ApJ, 257, p. 110
  • (1988) ApJ, 330, p. 766
  • (1997) ASP Conf. Ser., , in press
  • Moffat, A.F.J., (1997), in preparation; Moffat, A.F.J., Koenigsberger, G., Auer, L.H., (1989) ApJ, 344, p. 734
  • Moffat, A.F.J., Marchenko, S.V., Bartzakos, P., (1996) Rev. Mexicana Astron. Astrofis., 5, p. 38
  • Morel, T., St-Louis, N., Marchenko, S.V., (1997) ApJ, 482. , in press
  • Niemela, V.S., (1988) ASP Conf. Ser. I, Progress and Opportunities in Southern Hemisphere Optical Astronomy, p. 381. , ed. V. M. Blanco & M. M. Philips (San Francisco: ASP)
  • Niemela, V.S., Barba, R.H., Morrell, N.L., Corti, M., (1997) ASP Conf. Ser., 120. , Luminous Blue Variables: Massive Stars in Transition, ed. A. Nota & H. J. G. L. M. Lamers (San Francisco : ASP)
  • Robert, C., Moffat, A.F.J., Bastien, P., Drissen, L., St-Louis, N., (1989) ApJ, 347, p. 1034
  • (1990) ApJ, 359, p. 211
  • Robert, C., (1992) ApJ, 397, p. 277
  • Shore, S.N., Brown, D.N., (1988) ApJ, 334, p. 1021
  • Simons, J.F.L., Boyle, C.B., (1984) A&A, 134, p. 368
  • Smith, L.F., Shara, M.M., Moffat, A.F.J., (1996) MNRAS, 281, p. 163
  • Stahl, O., Buzzoni, B., Kraus, G., Schwarz, H., Metz, K., Roth, M., (1986) ESO Messenger, 46, p. 23
  • Sterken, C., Breysacher, J., (1997) A&A, , in preparation
  • Stevens, I.R., Blondin, J.M., Pollock, A.M.T., (1992) ApJ, 386, p. 265
  • St-Louis, N., Dalton, M.J., Marchenko, S.V., Moffat, A.F.J., Willis, A.J., (1995) ApJ, 452, pp. L57
  • St-Louis, N., Drissen, L., Moffat, A.F.J., Bastien, P., Tapia, S., (1987) ApJ, 322, p. 870
  • St-Louis, N., Hill, G., Moffat, A.F.J., Bartzakos, P., Antokhin, I.I., (1996) Wolf-Rayet Stars in the Framework of Stellar Evolution, , ed. J. M. Vreux, A. Detal, D. Fraipont-Caro, E. Gosset, & G. Rauw (Liège: Institut d'Astrophysique, Univ. Liège)
  • St-Louis, N., Moffat, A.F.J., Drissen, L., Bastien, P., Robert, C., (1988) ApJ, 330, p. 286
  • St-Louis, N., Moffat, A.F.J., Lapointe, L., Efimov, Yu.S., Shakovskoy, N.M., Fox, G.K., Piirola, V., (1993) ApJ, 410, p. 342
  • Szeifert, Th., Stahl, O., Wolf, B., Zickgraf, F.-J., Bouchet, P., Klare, G., (1993) A&A, 280, p. 508
  • Walborn, N.R., (1977) ApJ, 215, p. 53

Citas:

---------- APA ----------
Moffat, A.F.J., Marchenko, S.V., Bartzakos, P., Nlemela, V.S., Cerruti, M.A., Magalhães, A.M., Balona, L.,..., Lamontagne, R. (1998) . The luminous eclipsing SMC OB + WN binary HD 5980 before and during the recent LBV-like outburst: An extreme case of colliding winds. Astrophysical Journal, 497(2 PART I), 896-911.
http://dx.doi.org/10.1086/305475
---------- CHICAGO ----------
Moffat, A.F.J., Marchenko, S.V., Bartzakos, P., Nlemela, V.S., Cerruti, M.A., Magalhães, A.M., et al. "The luminous eclipsing SMC OB + WN binary HD 5980 before and during the recent LBV-like outburst: An extreme case of colliding winds" . Astrophysical Journal 497, no. 2 PART I (1998) : 896-911.
http://dx.doi.org/10.1086/305475
---------- MLA ----------
Moffat, A.F.J., Marchenko, S.V., Bartzakos, P., Nlemela, V.S., Cerruti, M.A., Magalhães, A.M., et al. "The luminous eclipsing SMC OB + WN binary HD 5980 before and during the recent LBV-like outburst: An extreme case of colliding winds" . Astrophysical Journal, vol. 497, no. 2 PART I, 1998, pp. 896-911.
http://dx.doi.org/10.1086/305475
---------- VANCOUVER ----------
Moffat, A.F.J., Marchenko, S.V., Bartzakos, P., Nlemela, V.S., Cerruti, M.A., Magalhães, A.M., et al. The luminous eclipsing SMC OB + WN binary HD 5980 before and during the recent LBV-like outburst: An extreme case of colliding winds. Astrophys. J. 1998;497(2 PART I):896-911.
http://dx.doi.org/10.1086/305475