Bibcode
Magazzu, A.; Martin, E. L.; Rebolo, R.
Bibliographical reference
Astronomy and Astrophysics (ISSN 0004-6361), vol. 249, no. 1, Sept. 1991, p. 149-155.
Advertised on:
9
1991
Citations
47
Refereed citations
35
Description
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.