Metallicity and abundance ratios in elliptical galaxies

Details Metallicity and abundance ratios in elliptical galaxies Metallicity and abundance ratios in elliptical galaxies

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.278..841d&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 278, Issue 3, pp. 841-844.

Astronomy and Astrophysics

Astronomy

9

Galaxies: Abundances, Galaxies: Elliptical And Lenticular, Cd, Galaxies: Evolution

Scientific paper

Using the theoretical results of Barbuy, the variation of the Mg_2 index as a function of the stellar parameters (T_eff, logg, [Fe/H]), including the Mg/Fe ratio, is obtained. This allows a new calibration of the metallicity indicators Mg_2 and [Fe] through synthetic indices computed for stellar populations having a metallicity spread and ages of the order of 14-16 Gyr. The models indicate that the integrated Mg_2 index depends on the chemical history, since it varies not only with the metallicity but also with the average Mg/Fe ratio. The study of a sample of elliptical galaxies shows that on average, [Mg/Fe]=0.40, comparable to the values observed in metal-poor galactic halo stars. This confirms the early suspicions that elliptical galaxies (Es) had a very high star formation rate in the past, and that the enrichment was caused by massive stars.

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