Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-01-29
Astron.Astrophys. 280 (2002) 143
Astronomy and Astrophysics
Astrophysics
Kluwer LaTeX, 8 pages, 3 enclosed figures, Astrophysics and Space Science, accepted
Scientific paper
10.1023/A:1015539214300
The sensitivity of stellar spectra to alpha/Fe abundance changes is investigated with the aim to be detected photometricly and employed for scientific goals of the GAIA mission. A grid of plane parallel, line blanketed, flux constant, LTE model atmospheres with different [alpha/Fe] ratios was calculated. As a first step, the modelled stellar energy fluxes for solar-type stars and giants were computed and intercompared. The spectral sensitivity talpha/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 of alpha/Fe abundance changes.
Edvardsson Bengt
Tautvaisiene Gražina
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