Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-05-19
Astronomy and Astrophysics
Astrophysics
3 pages, latex, 2 figures, Accepted for publication in A&A Letters
Scientific paper
An apparent Ca underabundance for cool metal rich disk dwarfs was derived by Feltzing & Gustafsson (1998, A&AS, 129, 237). This was suggested to be a NLTE effect, following the prediction by Drake (1991, MNRAS, 251, 369). New NLTE calculations with MARCS atmospheres and opacities (Thor\'en, P., 2000, A&A, in preparation) show that deviations from LTE are very small and can not explain the underabundance. It is shown that the underabundance was primarily due to erroneously calculated atomic line broadening parameters (van der Waals broadening). Part of the underabundance was also due to the decision not to change photometrically determined stellar parameters to satisfy the Fe I excitation balance.
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