Volume 409, Number 3, October III 2003
|Page(s)||993 - 1005|
|Section||Stellar structure and evolution|
|Published online||17 November 2003|
Optical spectra of selected Chamaeleon I young stellar objects*
Observatorio Astronómico de Córdoba, Laprida 854, 5000 Córdoba, Argentina e-mail: firstname.lastname@example.org;email@example.com;firstname.lastname@example.org
2 INAF–Osservatorio Astrofisico di Arcetri, L.go E. Fermi, 5 50125 Firenze, Italia e-mail: email@example.com;firstname.lastname@example.org
3 Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile e-mail: email@example.com
4 Istituto Astrofisica Spaziale e Fisica Cosmica, CNR, Via del Fosso del Cavaliere 00133, Roma, Italia e-mail: firstname.lastname@example.org
Corresponding author: C. Saffe, email@example.com
Accepted: 22 July 2003
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 Hα 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 Hα; 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.
Key words: stars: pre-main sequence / stars: Hertzsprung-Russell (HR) diagram / stars: low-mass, brown dwarfs / infrared: stars
© ESO, 2003
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.