2MASSI J1315309-264951

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dc.contributor.authorHall, PB
dc.date.accessioned2025-01-21T01:30:32Z
dc.date.available2025-01-21T01:30:32Z
dc.date.issued2002
dc.description.abstractThe object 2MASSI J1315309-264951 is an L3 dwarf with strong H emission discovered in the course of a color-selected survey for active galactic nuclei using the Two Micron All Sky Survey (2MASS). The strength of its Halpha emission decreased by about a factor of 2 between two epochs separated by 137 days. This is the first time that variable Halpha emission has been reported in an L dwarf, and it is probably the first observation of an Halpha flare in an L dwarf. The value of (L-Halpha/L-bol)> -4.17 at the discovery epoch is larger than that of any other L dwarf, but it is comparable to that of 2MASSI J1237392-652615, the only reported T dwarf with Halpha emission. The observed variability indicates that the H emission of 2MASSI J1315309-264951 is powered either by magnetic fields or by accretion in a binary system. Spectroscopic or narrowband Halpha monitoring of L and T dwarfs on timescales of hours to days would be the most useful step toward a better understanding of their Halpha emission mechanism(s).
dc.fuente.origenWOS
dc.identifier.issn0004-637X
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/96798
dc.identifier.wosidWOS:000173167300008
dc.issue.numero2
dc.language.isoen
dc.pagina.finalL92
dc.pagina.inicioL89
dc.revistaAstrophysical journal
dc.rightsacceso restringido
dc.subjectstars : activity
dc.subjectstars : individual (2MASSI J1237392-652615, 2MASSI J1315309-264951, 2MASSW J0036159+182110)
dc.subjectstars : low-mass, brown dwarfs
dc.title2MASSI J1315309-264951
dc.typeartículo
dc.volumen564
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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