Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...326..731m&link_type=abstract
Astronomy and Astrophysics, v.326, p.731-735
Astronomy and Astrophysics
Astrophysics
10
Stars: Abundances, Binaries: Eclipsing, Stars: Evolution, Interiors, Individual: V471 Tau
Scientific paper
We have observed the spectral regions around the LiI resonance 670.8nm and subordinate 610.4nm lines of V471 Tau. This is an eclipsing post common-envelope (CE) binary system. A revision of several independent measurements of the parallax and proper motion of V471 Tau allow us to argue that this system is indeed a Hyades cluster member by examining and rejecting earlier, flawed results. Using spectral synthesis and taking into account NLTE effects, we have derived a photospheric Li abundance of log N(Li)=2.35+/-0.25 for the K dwarf, which is a factor >100 higher than single Hyades members of the same mass. We argue that two mechanisms are responsible for this: a) Accretion of a substantial amount of Li-rich material onto the K dwarf during CE evolution inside the giant precursor of the white dwarf. Recently, a number of Li-rich giants have been observed and they appear to undergo large mass-loss. We speculate that CE evolution could actually explain the properties of these giants as well. b) Reduced Li depletion in the K dwarf due to sustained fast rotation in a short-period tidally-locked orbit. This process accounts for the preservation of Li after CE evolution has ceased.
Martin Eduardo L.
Pavlenko Yakiv
Rebolo Rafael
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