Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-10-15
Astron.J.125:343,2003
Astronomy and Astrophysics
Astrophysics
11 pages, 2 figures, Astronomical Journal in press -- Jan 2003 issue
Scientific paper
10.1086/345514
Time series spectrophotometry of the L5 dwarf 2MASS 01443536-0716142 showed strong H\alpha emission which declined by nearly 75% in four consecutive exposures. The line was not detected in emission on a spectrum obtained eleven months later. This behavior constrasts with that of 2MASSI J1315309-264951, an L5 dwarf which has shown even stronger H\alpha emission on four separate occasions. The observational database suggests that L dwarfs can be found in such strong flares only occasionally, with a duty cycle of order 1%. In contrast, the few, continuously-strong H\alpha emitters, including PC 0025+0447 and 2MASSI J1237392+652615, must either be (1) objects no older than 10-100 Myrs with continuously-active accretion and/or chromospheres, but which apparently formed in isolation from known young stellar clusters and associations, or (2) objects empowered by a different and unknown mechanism for the H\alpha energy.
Burgasser Adam
Cruz Kelle L.
Gizis John E.
Kirkpatrick Joseph D.
Liebert James
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