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HD 10745


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On a Rapid Lithium Enrichment and Depletion of K Giant Stars
A model scenario has recently been introduced by de la Reza andcolleagues to explain the presence of very strong Li lines in thespectra of some low-mass K giant stars. In this scenario all ordinary,Li-poor, K giants become Li rich during a short time (~105 yr) whencompared to the red giant phase of 5 x 107 yr. In this "Li period," alarge number of the stars are associated with an expanding thincircumstellar shell supposedly triggered by an abrupt internal mixingmechanism resulting in a surface new 7Li enrichment. This Letterpresents nearly 40 Li-rich K giants known up to now. The distribution ofthese Li-rich giants, along with 41 other observed K giants that haveshells but are not Li rich, in a color-color IRAS diagram confirms thisscenario, which indicates, also as a new result, that a rapid Lidepletion takes place on a timescale of between ~103 and 105 yr. Thismodel explains the problem of the presence of K giants with far-infraredexcesses presented by Zuckerman and colleagues. Other present and futuretests of this scenario are briefly discussed.

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Observation and Astrometry data

Constellation:Eridanus
Right ascension:01h43m31.03s
Declination:-57°41'11.2"
Apparent magnitude:9.429
Proper motion RA:6.9
Proper motion Dec:9
B-T magnitude:10.732
V-T magnitude:9.537

Catalogs and designations:
Proper Names
HD 1989HD 10745
TYCHO-2 2000TYC 8481-82-1
USNO-A2.0USNO-A2 0300-00522630
HIPHIP 8058

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