Thursday, July 4, 2013

1307.0618 (B. Stelzer et al.)

X-Shooter spectroscopy of brown dwarfs in the TW Hya association    [PDF]

B. Stelzer, J. M. Alcala, A. Frasca
We present broad-band mid-resolution X-Shooter/VLT spectra for four brown dwarfs of the TW Hya association. Our targets comprise substellar analogs representing the different evolutionary phases in young stellar evolution: For the two diskless brown dwarfs, TWA-26 and TWA-29, we determine the stellar parameters and we study their chromospheric emission line spectrum. For the two accreting brown dwarfs, TWA-27 and TWA-28, we estimate the mass accretion rates from empirical correlations between emission line luminosities and the accretion luminosity.
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