dc.creator | Koenigsberger, Gloria | |
dc.creator | Georgiev, Leonid | |
dc.creator | Hillier, D. John | |
dc.creator | Morrell, Nidia Irene | |
dc.creator | Barba, Rodolfo Hector | |
dc.creator | Gamen, Roberto Claudio | |
dc.date.accessioned | 2016-12-16T17:42:53Z | |
dc.date.accessioned | 2018-11-06T13:48:57Z | |
dc.date.available | 2016-12-16T17:42:53Z | |
dc.date.available | 2018-11-06T13:48:57Z | |
dc.date.created | 2016-12-16T17:42:53Z | |
dc.date.issued | 2010-06 | |
dc.identifier | Koenigsberger, Gloria; Georgiev, Leonid; Hillier, D. John; Morrell, Nidia Irene; Barba, Rodolfo Hector; et al.; A ~ 40 year variability cycle in the luminous blue variable/Wolf-Rayet Binary System HD 5980?; Iop Publishing; Astronomical Journal; 139; 6; 6-2010; 2600-2611 | |
dc.identifier | 0004-6256 | |
dc.identifier | http://hdl.handle.net/11336/9583 | |
dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/1879734 | |
dc.description.abstract | The massive Wolf-Rayet stellar system HD 5980 in the Small Magellanic Cloud entered a sudden and brief ~ 1-3 mag eruptive state in the mid-1990s. The cause of the instability is not yet understood, but mechanisms similar to those in luminous blue variables are suspected. Using a previously unreported set of spectroscopic data obtained in 1955-1967 and recently acquired optical and HST/STIS spectra, we find that (1) the brief eruptions of 1993 and 1994 occurred at the beginning of an extended (~ decades) high state of activity characterized by large emission-line intensities; (2) the level of activity is currently subsiding; and (3) another strong emission-line episode appears to have occurred between 1960 and 1965, suggesting the possibility that the long-term cyclical variability may be recurrent on a ~ 40 year timescale. These characteristics suggest the possible classification of HD 5980 as an S Doradus-type variable. The effects due to binary interactions in the system are discussed, and we tentatively suggest that the short duration and relatively hot spectral type (WN11/B1.5I) observed during maximum in the visual light curve may be attributed to these interactions. | |
dc.language | eng | |
dc.publisher | Iop Publishing | |
dc.relation | info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0004-6256/139/6/2600/meta | |
dc.relation | info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1088/0004-6256/139/6/2600 | |
dc.rights | https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ | |
dc.rights | info:eu-repo/semantics/restrictedAccess | |
dc.subject | Eclipsing binaries: | |
dc.subject | HD 5980 (estrella) | |
dc.subject | S Doradus (estrella) | |
dc.subject | Wolf-Rayet stars | |
dc.subject | Variable stars | |
dc.title | A ~ 40 year variability cycle in the luminous blue variable/Wolf-Rayet Binary System HD 5980? | |
dc.type | Artículos de revistas | |
dc.type | Artículos de revistas | |
dc.type | Artículos de revistas | |