SIMBAD references

2005MNRAS.362....2T - Mon. Not. R. Astron. Soc., 362, 2-8 (2005/September-1)

Hot stars in old stellar populations: a continuing need for intermediate ages.


Abstract (from CDS):

We investigate the effect of a low-level contamination of hot, old, metal-poor starlight on the inferred stellar populations of early-type galaxies in the core of the Coma Cluster. We find that the required correction to the Balmer and metal absorption-line strengths for old, metal-poor stars does not significantly affect the inferred age of the stellar population when the Hβ strength is large. Intermediate-aged populations are therefore still needed to explain enhanced Balmer-line strengths in early-type galaxies. This gives us increased confidence in our age estimates for these objects. For galaxies with weak Balmer-line strengths corresponding to very old populations (t > 10 Gyr), however, a correction for hot stars may indeed alter the inferred age, as previously suggested. Finally, the inferred metallicity [Z/H] will always be higher after any correction for old, metal-poor starlight than if it were not taken into account, but the enhancement ratios [E/Fe] will strengthen only slightly.

Abstract Copyright: 2005 RAS

Journal keyword(s): galaxies: clusters: individual: Coma - galaxies: elliptical and lenticular, cD - galaxies: stellar content

CDS comments: in Tables 1, 3 : Galaxies DNNN = [D80] ACO 1656 NNN.

Simbad objects: 15

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