We present X-shooter observations of two brown dwarf candidates. We focus on the determination of stellar parameters and their errors. The targets, an accreting class II and a non-accreting class III objects, are members of the σ Orionis star-forming region. We derive the spectroscopic spectral types from the VIS spectrum and the stellar parameters. We find that the uncertainties on the stellar parameters have a minor effect on the determination of the mass accretion rate for the accreting star, thus confirming that the discrepancies between the mass accretion rate estimates found with different (simultaneous) tracers are probably due to different physical conditions where the accretion/wind indicators are produced.
Rigliaco E, Natta A, Testi L, Randich S, Covino E, Alcal#224, et al. (2011). Stellar parameters of young brown dwarfs. ASTRONOMISCHE NACHRICHTEN, 332, 249-250 [10.1002/asna.201111527].
Stellar parameters of young brown dwarfs
Testi L;
2011
Abstract
We present X-shooter observations of two brown dwarf candidates. We focus on the determination of stellar parameters and their errors. The targets, an accreting class II and a non-accreting class III objects, are members of the σ Orionis star-forming region. We derive the spectroscopic spectral types from the VIS spectrum and the stellar parameters. We find that the uncertainties on the stellar parameters have a minor effect on the determination of the mass accretion rate for the accreting star, thus confirming that the discrepancies between the mass accretion rate estimates found with different (simultaneous) tracers are probably due to different physical conditions where the accretion/wind indicators are produced.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
