A&A 438, 685-704 (2005)
The sensitivity of Lick indices to abundance variationsA. J. Korn, C. Maraston and D. Thomas
Max-Planck-Institut für extraterrestrische Physik (MPE), Giessenbachstraße, 85748 Garching, Germany
(Received 6 October 2004 / Accepted 17 April 2005)
We present results of model atmosphere/line formation calculations which quantitatively test how the 21 classical and four higher-order Balmer-line Lick/IDS indices (Worthey et al. 1994, ApJS, 94, 687; Worthey & Ottaviani 1997, ApJS, 111, 377) depend on individual elemental abundances (of carbon, nitrogen, oxygen, magnesium, iron, calcium, sodium, silicon, chromium, titanium) and overall metallicity in various stellar evolutionary stages and at various metallicities. At low metallicities the effects of an overall enhancement of -elements are also investigated. The general results obtained by Tripicco & Bell (1995, ApJ, 110, 3035) at solar metallicity are confirmed, while details do differ. Tables are given detailing to which element every index reacts significantly, as a function of evolutionary stage and composition.
Key words: radiative transfer -- line: formation -- stars: late-type -- galaxies: abundances -- galaxies: evolution -- galaxies: fundamental parameters
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