Lithium abundances from the 6104A line in cool Pleiades stars

Abstract

Lithium abundances determined by spectral synthesis from both the 6708A resonance line and the 6104 subordinate line are reported for 11 late-type Pleiades stars, including spectra previously analysed by Russell (1996). We report a 0.7 dex scatter in the abundances from 6708A, and a scatter at least as large from the 6104A line. We find a reasonable correllation between the 6104A and 6708A Li abundances, although four stars have 6104A-determined abundances which are significantly larger than the 6708-determined values, by up to 0.5 dex, suggesting problems with the homogeneous, one-dimensional atmospheres being used. We show that these discrepancies can be explained, although probably not uniquely, by the presence of star spots with plausible coverage fractions. The addition of spots does not significantly reduce the apparent scatter in Li abundances, leaving open the possibility that at least some of the spread is caused by real star-to-star differences in pre-main- sequence Li depletion.

13 pages, 7 figures; Accepted by A&A 17/05/02

References in corpus (2)

• The effect of stellar activity on the LiI 6708, NaI 5896 and KI 7699 Ålines: A comparison with the Pleiades, field stars and the Sun
• On the dispersion in lithium and potassium among late-type stars in young clusters: IC 2602

Cited by in corpus (12)

• The lithium-rotation connection in the 125 Myr-old Pleiades cluster
• Chemical composition of A and F dwarfs members of the Pleiades open cluster
• Oxygen from the Lambda 7774 High-Excitation Triplet in Open Cluster Dwarfs: Hyades
• Low-mass members of the young cluster IC 4665 and pre-main-sequence lithium depletion
• Cool stars in NGC 2547 and pre main sequence lithium depletion
• Li I and K I Scatter in Cool Pleiades Dwarfs
• Pre-main-sequence Lithium Depletion
• Mixing at young ages: Beryllium abundances in cool main-sequence stars of the open clusters IC 2391 and IC 2602
• Lithium in the Upper Centaurus Lupus and Lower Centaurus Crux Subgroups of Scorpius-Centaurus
• Oxygen abundance of open cluster dwarfs
• On the potassium-rotation connection in late-type Alpha Persei stars
• Nitrogen Abundances and the Distance Moduli of the Pleiades and Hyades