EDP Sciences
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Volume 415, Number 2, February IV 2004
Page(s) 677 - 684
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20034620

A&A 415, 677-684 (2004)
DOI: 10.1051/0004-6361:20034620

Li abundance/surface activity connections in solar-type Pleiades

D. Clarke1, E. C. MacDonald2 and S. Owens1

1  Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, Scotland, UK
2  Department of Astrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK

(Received 14 April 2003 / Accepted 13 November 2003)

The relation between the lithium abundance, $A_{\rm
Li}$ , and photospheric activity of solar-type Pleiads is investigated for the first time via acquisition and analysis of B and V-band data. Predictions of activity levels of target stars were made according to the $A_{\rm
Li}$/ (B-V) relation and then compared with new CCD photometric measurements. Six sources behaved according to the predictions while one star (HII 676), with low predicted activity, exhibited the largest variability of the study; another star (HII 3197), with high predicted activity, was surprisingly quiet. Two stars displayed non-periodic fadings, this being symptomatic of orbiting disk-like structures with irregular density distributions. Although the observation windows were not ideal for rotational period detection, some periodograms provided possible values; the light-curve obtained for HII 1532 is consistent with that previously recorded.

Key words: stars: solar-type -- stars: rotation

Offprint request: D. Clarke, d.clarke@astro.gla.ac.uk

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© ESO 2004