Lithium in the pre-main sequence triple system UX Tauri

Details Lithium in the pre-main sequence triple system UX Tauri Lithium in the pre-main sequence triple system UX Tauri

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...249..149m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 249, no. 1, Sept. 1991, p. 149-155.

Astronomy and Astrophysics

Astrophysics

37

Late Stars, Lithium, Pre-Main Sequence Stars, T Tauri Stars, Triple Stars, H Alpha Line, High Resolution, Stellar Luminosity, Stellar Spectra

Scientific paper

High-resolution spectra (range 655-675 nm) are presented of the pre-main sequence triple system UX Tau. Favorable seeing conditions allowed detection of the spectra of the faintest component, where detection of the H-alpha and the Li-I 670.7 nm feature are reported. An estimate of effective temperature, luminosity, and mass leads to the conclusion that the object is a very young, very-low-mass object, close to the mass limit separating stars from brown dwarfs. Lithium abundances and the evolutionary status of the system are discussed, with special attention to the faint companion. A powerful observational test for evolutionary models of very-low-mass stars can come from lithium measurements, which can set restrictions to the maximum internal temperature attained by these objects.

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