Chromospherically active stars in the Galactic bulge

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dc.contributor.authorDrake, AJ
dc.date.accessioned2025-01-21T01:06:24Z
dc.date.available2025-01-21T01:06:24Z
dc.date.issued2006
dc.description.abstractWe present the results from the discovery and study of similar to 3000 chromospherically active giant and subgiant stars toward the Galactic bulge. We find that these stars are predominantly RS CVn binaries with rotation periods between 10 and 100 days. We discover that the average rotational period of these stars decreases with their distance from the Galactic plane. We find that the primary stars in the RS CVn systems are predominantly first-ascent giants. Our research also suggests that if these stars have spot cycles like the Sun, then the cycle period must be longer than 10 yr on average. We confirm that the amplitude of the spot-induced modulations observed in the light curves of these objects is generally larger at minimum light than at maximum. Furthermore, we confirm that the amplitudes of the modulations due to stellar spots generally increase as the observed change in average brightness increases. We find no evidence for a relationship between a chromospherically active star's brightness and its rotational period. However, the average period does increase with color for stars with periods <= 30 days.
dc.fuente.origenWOS
dc.identifier.eissn1538-3881
dc.identifier.issn0004-6256
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/96150
dc.identifier.wosidWOS:000235214500035
dc.issue.numero2
dc.language.isoen
dc.pagina.final1056
dc.pagina.inicio1044
dc.revistaAstronomical journal
dc.rightsacceso restringido
dc.subjectstars : rotation
dc.subjectstars : spots
dc.subjectstars : variables : other
dc.titleChromospherically active stars in the Galactic bulge
dc.typeartículo
dc.volumen131
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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