[en] Context. The role of mass and momentum exchanges in close massive binaries is very important in the subsequent evolution of the components. Such exchanges produce several observational signatures such as asynchronous rotation and altered chemical compositions,
that remain after the stars detach again.
Aims. We investigated these effects for the close O-star binary LSS 3074 (O4 f + O6-7:(f):), which is a good candidate for a past Roche lobe overflow (RLOF) episode because of its very short orbital period, P = 2.185 days, and the luminosity classes of both components.
Methods.We determined a new orbital solution for the system. We studied the photometric light curves to determine the inclination of the orbit and Roche lobe filling factors of both stars. Using phase-resolved spectroscopy, we performed the disentangling of the optical spectra of the two stars.We then analysed the reconstructed primary and secondary spectra with the CMFGEN model atmosphere code to determine stellar parameters, such as the effective temperatures and surface gravities, and to constrain the chemical composition of the components.
Results. We confirm the apparent low stellar masses and radii reported in previous studies. We also find a strong overabundance in nitrogen and a strong carbon and oxygen depletion in both primary and secondary atmospheres, together with a strong enrichment in helium of the primary star.
Conclusions. We propose several possible evolutionary pathways through a RLOF process to explain the current parameters of the system. We confirm that the system is apparently in overcontact configuration and has lost a significant portion of its mass to its surroundings. We suggest that some of the discrepancies between the spectroscopic and photometric properties of LSS 3074 could stem from the impact of a strong radiation pressure of the primary.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Raucq, Françoise ; Université de Liège > Groupe d'astrophysique des hautes énergies (GAPHE)
Gosset, Eric ; Université de Liège > Groupe d'astrophysique des hautes énergies (GAPHE)
Rauw, Grégor ; Université de Liège > Groupe d'astrophysique des hautes énergies (GAPHE)
Manfroid, Jean ; Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Mahy, Laurent ; Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Mennekens, Nicki; Vrije Universiteit Brussel - VUB > Astronomy and Astrophysics Research Group
Vanbeveren, Danny; Vrije Universiteit Brussel - VUB > Astronomy and Astrophysics Research Group
Language :
English
Title :
Observational signatures of past mass-exchange episodes in massive binaries: the case of LSS 3074
Gosset, E., Rauw, G., Manfroid, J., et al. 2005, Proceedings of Massive Stars and High-Energy Emission in OB Associations, a workshop of the JENAM 2005, Distant Worlds, held in Liège (Belgium), July 4-7, eds. G. Rauw, Y. Nazé, R. Blomme, & E. Gosset, 77
Gray, D. F. 2008, The Observation and Analysis of Stellar Photospheres, 3rd edn. (Cambridge University Press)
Gray, R. O. 2010, http: //www. appstate. edu/~grayro/spectrum/ spectrum276/node38. html
Haefner, R., Simon, K. P., & Fiedler, A. 1994, IBVS, 3969, 1
Heger, A., Langer, N., & Woosley, S. E. 2000, ApJ, 528, 368
Herbig, G. 1995, ARA&A, 33, 19
Hillier, D. J., & Miller, D. L. 1998, ApJ, 496, 407
Horne, K. 1991, in Fundamental Properties of Cataclysmic Variable Stars: 12th North American Workshop on Cataclysmic Variables and Low Mass X-ray Binaries, ed. A. W. Shafter (SDSU Press), 23
Houk, N., & Cowley, A. P. 1975, in University of Michigan Catalogue of twodimensional spectral types for the HD stars, Vol. I. Declinations-90 to-53- Howarth, I. D. 1997, The Observatory, 117 335
Hurley, J. R., Tout, C. A., & Pols, O. R. 2002, MNRAS, 329, 897
Jansen, F., Lumb, D., Altieri, B., et al. 2001, A&A, 365, L1
Kaufer, A., Stahl, O., Tubbesing, S., et al. 1999, The Messenger, 95, 8
Kippenhahn, R., & Weigert, A. 1967, Z. Astrophys., 65, 251
Langer, N. 2012, ARA&A, 50, 107
Linder, N., Rauw, G., Sana, H., De Becker, M., & Gosset, E. 2007, A&A, 474, 193
Linder, N., Rauw, G., Martins, F., Sana, H., De Becker, M., & Gosset, E. 2008, A&A, 489, 713
Lorenzo, J., Negueruela, I., Val Baker, A. K. F., et al. 2014, A&A, 572, A110
MacConnell, D. J. 1981, A&AS, 44, 387
Mahy, L. 2011, Ph. D. Thesis, University of Liège, Belgium
Mahy, L., Gosset, E., Sana, H., et al. 2012, A&A, 540, A97
Maíz Apellániz, J., Sota, A., Arias, J. I., et al. 2016, ApJS, 224, 4
Manfroid, J. 1993, A&A, 271, 714
Manfroid, J., Royer, P., Rauw, G., & Gosset, E. 2001, in Astronomical Data Analysis Software and Systems X, eds. F. Harnden, F. Primini, & H. Payne, ASP Conf. Ser., 238, 373
Martins, F. 2011, Bull. Soc. Roy. Sci. Liège, 80, 29
Martins, F., & Plez, B. 2006, A&A, 457, 637
Martins, F., Schaerer, D., & Hillier, D. J. 2005, A&A, 436, 1049
Martins, F., Hervé, A., Bouret, J.-C., et al. 2015, A&A, 575, A34
Mason, B. D., Gies, D. R., Hartkopf, W. I., et al. 1998, AJ, 115, 821
Morrell, N. I., & Niemela, V. S. 1990, in Properties of hot luminous stars, ASP Conf. Ser., 7, 57
Muijres, L. E., Vink, J. S., de Koter, A., Müller, P. E., & Langer, N. 2012, A&A, 537, A37
Nazé, Y. 2009, A&A, 506, 1055
Nazé, Y., Rauw, G., Vreux, J.-M., & De Becker, M. 2004, A&A, 417, 667
Niemela, V. S., Cerruti, M. A., Morrell, N. I., & Luna, H. G. 1992, in Evolutionary Processes in Interacting Binary Stars (Dordrecht Kluwer: Acad. Publ.), 505
Palate, M., & Rauw, G. 2012, A&A, 537, A119
Palate, M., Rauw, G., Koenigsberger, G., & Moreno, E. 2013, A&A, 552, A39
Pigulski, A., & Pojmánski, G. 2008, A&A, 477, 917
Podsiadlowski, P., Joss, P. C., & Hsu, J. J. L. 1992, ApJ, 391, 246
Prinja, R. K., Barlow, M. J., & Howarth, I. D. 1990, ApJ, 361, 607
Raucq, F., Rauw, G., Gosset, E., et al. 2016, A&A, 588, A10
Rauw, G. 2007, DSc Thesis, University of Liège, Belgium
Rauw, G., Crowther, P. A., Eenens, P. R. J., Manfroid, J., & Vreux, J.-M. 2002, A&A, 392, 563
Reed, B. C. 2003, AJ, 125, 2531
Richards, M. T., Cocking, A. S., Fisher, J. G., & Conover, M. J. 2014, ApJ, 795, 160
Sana, H., Gosset, E., & Rauw, G. 2006a, MNRAS, 371, 67
Sana, H., de Mink, S. E., de Koter, A., et al. 2012, Science, 337, 444
Sana, H., Le Bouquin, J.-B., Lacour, S., et al. 2014, ApJS, 215, 15
Seidensticker, K. J. 1989, A&AS, 79, 61
Seidensticker, K. J., & Schmidt-Kaler, Th. 1989, A&A, 225, 192
Simón-Díaz, S., & Herrero, A. 2007, A&A, 468, 1063
Smith, R. K., Brickhouse, N. S., Liedahl, D. A., & Raymond, J. C. 2001, ApJ, 556, L91
Sota, A., Maíz Apellániz, J., Walborn, N. R., et al. 2011, ApJS, 193, 24
Sota, A., Maíz Apellániz, J., Morrell, N. I., et al. 2014, ApJS, 211, 10
Stetson, P. B. 1987, PASP, 99, 191
Strüder, L., Briel, U., Dennerl, K., et al. 2001, A&A, 365, L18
Turner, M. J. L., Abbey, A., Arnaud, M., et al. 2001, A&A 365, L27
Underhill, A. B. 1995, ApJS, 100, 433
Vanbeveren, D., de Loore, C., Van Rensbergen, W. 1998, A&ARv, 9, 63
van der Hucht, K. A. 1996, in Wolf-Rayet stars in the framework of stellar evolution, Liège International Astrophysical Colloquium, 33, eds. J.-M. Vreux, A. Detal, D. Fraipont-Caro, E. Gosset, & G. Rauw, 1
Walborn, N. R. 2001, in Eta Carinae and Other Mysterious Stars: The hidden opportunities of emission spectroscopy, eds. T. R. Gull, S. Johannson, & K. Davidson, ASP Conf. Ser., 242, 217
Walborn, N. R., Howarth, I. D., Lennon, D. J., et al. 2002, AJ, 123, 2754