2MASS 1315-2649

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dc.contributor.authorHall, PB
dc.date.accessioned2025-01-21T01:10:14Z
dc.date.available2025-01-21T01:10:14Z
dc.date.issued2002
dc.description.abstractIn a previous Letter, I reported that 2MASSI J1315309-264951 is an L dwarf with strong Halpha emission. Two spectroscopic epochs appeared to show that the Halpha was variable, decreasing from 121 to 25 Angstrom EW, which I interpreted as a flare during the first observation. Gizis independently discovered this object, and his intermediate spectroscopic epoch shows Halpha with 97 Angstrom EW. A new fourth epoch of spectroscopy again shows a very large Halpha EW (124 A), confirming this object to be a persistent, strong Halpha emitter. Whether the Halpha is steady (like 2MASS 1237+6526) or the result of continuous strong flaring (like PC 0025+0447) remains unclear. Imaging confirms that 2MASS 1315-2649 has a high proper motion (0."71 yr(-1)), corresponding to a transverse velocity of similar to76 km s(-1) at its distance of similar to23 pc. Thus, 2MASS 1315-2649 is consistent with being greater than or similar to2 Gyr old and therefore relatively massive. If that is so, the correlation of Halpha activity with mass found by Gizis et al. would seem to support the continuous strong flaring scenario, although it does not rule out a brown dwarf binary accretion scenario.
dc.fuente.origenWOS
dc.identifier.issn0004-637X
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/96665
dc.identifier.wosidWOS:000179291500018
dc.issue.numero1
dc.language.isoen
dc.pagina.finalL78
dc.pagina.inicioL77
dc.revistaAstrophysical journal
dc.rightsacceso restringido
dc.subjectstars : activity
dc.subjectstars : individual (2MASSI
dc.subjectJ1237392+652615, 2MASSI J1315309-264951
dc.subjectPC 0025+0447)
dc.subjectstars : low-mass, brown dwarfs
dc.title2MASS 1315-2649
dc.typeartículo
dc.volumen580
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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