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Astron. Astrophys. 322, 131-138 (1997)

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The relationship between lithium and activity in disk population main sequence G and K stars *

F. Favata 1, G. Micela 2 and S. Sciortino 2

1 Astrophysics Division - ESA/ESTEC, Postbus 299, 2200 AG Noordwijk, The Netherlands, (e-mail: fabio.favata@astro.estec.esa.nl)
2 Istituto e Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, I-90134 Palermo, Italy,
(e-mail: gmicela@oapa.astropa.unipa.it, ssciortino@oapa.astropa.unipa.it)

Received 13 June 1996 / Accepted 23 August 1996


We present determinations of the lithium abundance (through observations of the Li I 6707.8 Å line) in a sample of main sequence stars with spectral types ranging from late F down to M0, selected from the sample of nearby stars which have been observed with the Einstein observatory. We show that lithium abundance is correlated with X-ray luminosity for the cooler stars in our sample ([FORMULA]), while no correlation is present for the hotter stars. However, the correlation is almost completely driven by a very small number of high lithium, high X-ray luminosity (and thus plausibly very young) cool dwarfs present in the sample. A number of high lithium K dwarfs are present in the survey, and their characteristics and likely age are discussed in detail.

Key words: stars: abundances – stars: late-type

* Based on observations collected at the ESO La Silla observatory

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© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998