Reference : New insights into the nature of the SMC WR/LBV binary HD 5980
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
http://hdl.handle.net/2268/2685
New insights into the nature of the SMC WR/LBV binary HD 5980
English
Foellmi, C. [> > > >]
Koenigsberger, G. [> > > >]
Georgiev, L. [> > > >]
Toledano, O. [> > > >]
Marchenko, S. V. [> > > >]
Massey, P. [> > > >]
Dall, T. H. [> > > >]
Moffat, A. F. J. [> > > >]
Morrell, N. [> > > >]
Corcoran, M. [> > > >]
Kaufer, A. [> > > >]
Nazé, Yaël mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Sciences spatiales >]
Pittard, J. [> > > >]
St-Louis, N. [> > > >]
Fullerton, A. [> > > >]
Massart, Damien mailto [Université de Liège - ULg > HEC-Ecole de gestion de l'ULg : UER > UER Finance et Droit >]
Pollock, A. M. T. [> > > >]
2008
Revista Mexicana de Astronomía y Astrofísica
Univ Nacional Autonoma Mexico, Inst De Astronomia
44
1
3-27
Yes
International
0185-1101
Mexico City
[en] stars : individual (HD 5980) ; stars : mass loss ; binaries : close
[en] We present the results of optical wavelength observations of the unusual SMC eclipsing binary system HD 5980 obtained in 1999 and 2004-2005. Radial velocity curves for the erupting LBV/WR object (star A) and its close WR-like companion (star B) are obtained by deblending the variable emission-line profiles of NIV and NV lines. The derived masses M-A = 58 - 79 M-circle dot and M-B = 51 - 67 M-circle dot, are more consistent with the the stars' location near the top of the HRD than previous estimates. The presence of a wind-wind interaction region is inferred from the orbital phase-dependent behavior of He I P Cygni absorption components. The emission-line intensities continued with the declining trend previously seen in UV spectra. The behavior of the photospheric absorption lines is consistent with the results of Schweickhardt (2000) who concludes that the third object in the combined spectrum, star C, is also a binary system with P-starC similar to 96.5 days, e=0.83.
Researchers ; Professionals
http://hdl.handle.net/2268/2685
http://arxiv.org/abs/0711.4858

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