α-process Elements in the Galaxy: A Possible GAIA Contribution |
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| Authors: | Gra?ina Tautvai?ien? Bengt Edvardsson |
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| Institution: | (1) Institute of Theoretical Physics and Astronomy, Goštauto 12, Vilnius, 2600, Lithuania;(2) Department of Astronomy and Space Physics, Uppsala Astronomical Observatory, Box 515, SE-751 20 Uppsala, Sweden |
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| Abstract: | The sensitivity of stellar spectra to α/Fe abundance changes is investigated with the aim to be detected photometrically and
employed for the scientific goals of the GAIA mission. A grid of plane parallel, line blanketed, flux constant, LTE model
atmospheres with different α/Fe] ratios was calculated. As a first step, the modeled stellar energy fluxes for solar-type
stars and giants were computed and intercompared. The spectral sensitivity to α/Fe abundance changes is noticeable and has
to be taken into account when selecting photometric filters for GAIA. The Ca II H and K lines and Mg I b triplet are the most
sensitive direct indicators ofα/Fe abundance changes.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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