The eclipsing LMC star OGLE 05155332-6925581: a clue for double periodic variables

dc.creatorMennickent, R. E.
dc.creatorKolaczkowski, Z.
dc.creatorMichalska, G.
dc.creatorPietrzyński, G.
dc.creatorGallardo, R.
dc.creatorCidale, Lydia Sonia
dc.creatorGranada, Anahí
dc.creatorGieren, W.
dc.date2008-12
dc.date2020-04-20T14:15:38Z
dc.date.accessioned2023-07-14T19:19:31Z
dc.date.available2023-07-14T19:19:31Z
dc.identifierhttp://sedici.unlp.edu.ar/handle/10915/93755
dc.identifierhttps://academic.oup.com/mnras/article/389/4/1605/1103880
dc.identifierhttps://ri.conicet.gov.ar/handle/11336/45717
dc.identifierissn:0035-8711
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7434862
dc.descriptionWe investigate the nature of OGLE05155332-6925581, one of the brightest members of the enigmatic group of double periodic variables (DPVs) recently found in the Magellanic Clouds. The modelling of archival orbital light curves (LCs), along with the analysis of the radial velocities (RVs) suggest that this object is a semidetached binary with the less massive star transferring matter to the more massive and less evolved star, in an Algol-like configuration. We find evidence for additional orbital variability and Hα emission, likely caused by an accretion disc around the primary star. As in the case of β Lyr the circumprimary disc seems to be more luminous than the primary, but we do not detect orbital period changes. We find that the LC follows a loop in the colour-magnitude diagram during the long cycle; the system is redder when brighter and the rising phase is bluer than during decline. Infrared excess is also present. The source of the long-term periodicity is not eclipsed, indicating its circumbinary origin. Strong asymmetries, discrete absorption components (DACs) and a γ shift are new and essential observational properties in the infrared HI lines. The DACs strength and RV follow a saw-teeth pattern during the orbital cycle. We suggest that the system experiences supercycles of mass outflow feeding a circumbinary disc. Mass exchange and mass loss could produce comparable but opposite effects in the orbital period on a long time-scale, resulting in a quasi-constancy of this parameter.
dc.descriptionFacultad de Ciencias Astronómicas y Geofísicas
dc.descriptionInstituto de Astrofísica de La Plata
dc.formatapplication/pdf
dc.format1605-1618
dc.languageen
dc.rightshttp://creativecommons.org/licenses/by-nc-sa/4.0/
dc.rightsCreative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.subjectAstronomía
dc.subjectbinaries: eclipsing
dc.subjectstars: early-type
dc.subjectstars: evolution
dc.subjectstars: mass-loss
dc.subjectstars: variables: other
dc.titleThe eclipsing LMC star OGLE 05155332-6925581: a clue for double periodic variables
dc.typeArticulo
dc.typeArticulo


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