Optical spectra of selected Chamaeleon I young stellar objects

Details Optical spectra of selected Chamaeleon I young stellar objects Optical spectra of selected Chamaeleon I young stellar objects

2003-07-31

arxiv.org/abs/astro-ph/0307566v1

Astron.Astrophys.409:993-1006,2003

Astronomy and Astrophysics

Astrophysics

22 pages - manuscript format

Scientific paper

10.1051/0004-6361:20031150

We present optical spectra of eight candidate brown dwarfs and a previously known T Tauri star (Sz 33) of the Chamaeleon I dark cloud. We derived spectral types based on the strength of the TiO or VO absorption bands present in the spectra of these objects as well as on the PC3 index of Martin et al. (1999). Photometric data from the literature are used to estimate the bolometric luminosities for these sources. We apply D'Antona & Mazzitelli (1997) pre-main sequence evolutionary tracks and isochrones to derive masses and ages. Based on the presence of Halpha in emission, we confirm that most of the candidates are young objects. Our sample however includes two sources for which we can only provide upper limits for the emission in Halpha; whereas these two objects are most likely foreground/background stars, higher resolution spectra are required to confirm their true nature. Among the likely cloud members, we detect one new sub-stellar object and three transition stellar/sub-stellar sources.

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