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dc.contributor.author
Georgiev, Leonid
dc.contributor.author
Koenigsberger, Gloria
dc.contributor.author
Hillier, D. John
dc.contributor.author
Morrell, Nidia
dc.contributor.author
Barba, Rodolfo Hector
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dc.contributor.author
Gamen, Roberto Claudio
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dc.date.available
2016-12-19T14:36:27Z
dc.date.issued
2011-12
dc.identifier.citation
Georgiev, Leonid; Koenigsberger, Gloria; Hillier, D. John; Morrell, Nidia; Barba, Rodolfo Hector; et al.; Wind structure and luminosity variations in the Wolf-Rayet/Luminous Blue Variable HD 5980; Iop Publishing; Astronomical Journal; 142; 6; 12-2011; 191-210
dc.identifier.issn
0004-6256
dc.identifier.uri
http://hdl.handle.net/11336/9695
dc.description.abstract
Over the past 40 years, the massive luminous blue variable/Wolf-Rayet system HD 5980 in the Small Magellanic Cloud (SMC) has undergone a long-term S Doradus-type variability cycle and two brief and violent eruptions in 1993 and 1994. In this paper we analyze a collection of UV and optical spectra obtained between 1979 and 2009 and perform CMFGEN model fits to spectra of 1994, 2000, 2002, and 2009. The results are as follows: (1) the long-term S Dor-type variability is associated with changes of the hydrostatic radius; (2) the 1994 eruption involved changes in its bolometric luminosity and wind structure; (3) the emission-line strength, the wind velocity, and the continuum luminosity underwent correlated variations in the sense that a decreasing V ∞ is associated with increasing emission line and continuum levels; and (4) the spectrum of the third star in the system (Star C) is well fit by a T eff = 32 K model atmosphere with SMC chemical abundances. For all epochs, the wind of the erupting star is optically thick at the sonic point and is thus driven mainly by the continuum opacity. We speculate that the wind switches between two stable regimes driven by the "hot" (during the eruption) and the "cool" (post-eruption) iron opacity bumps as defined by Lamers & Nugis and Gräfener & Hamann, and thus the wind may undergo a bi-stability jump of a different nature from that which occurs in OB stars.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Iop Publishing
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Binaries
dc.subject
Variable Stars
dc.subject
Wolf-Rayet Stars
dc.subject
Eclipsing Stars
dc.subject.classification
Astronomía
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Wind structure and luminosity variations in the Wolf-Rayet/Luminous Blue Variable HD 5980
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2016-12-14T15:26:00Z
dc.journal.volume
142
dc.journal.number
6
dc.journal.pagination
191-210
dc.journal.pais
Estados Unidos
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dc.journal.ciudad
Londres
dc.description.fil
Fil: Georgiev, Leonid. Universidad Autónoma de México; México
dc.description.fil
Fil: Koenigsberger, Gloria. Universidad Autónoma de México; México
dc.description.fil
Fil: Hillier, D. John. University Of Pittsburgh; Estados Unidos
dc.description.fil
Fil: Morrell, Nidia. The Carnegie Observatories. Las Campanas Observatory; Chile
dc.description.fil
Fil: Barba, Rodolfo Hector. Consejo Nacional de Investigaciones CientiÂficas y Tecnicas. Centro Cientifico Tecnologico San Juan. Instituto de Ciencias Astronomicas de la Tierra y del Espacio; Argentina. Universidad de la Serena; Chile
dc.description.fil
Fil: Gamen, Roberto Claudio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
dc.journal.title
Astronomical Journal
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1088/0004-6256/142/6/191
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0004-6256/142/6/191/meta
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