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Date and Time of the Query: 2019-05-22 T11:20:09 PDT
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For refcode 2005MNRAS.362....2T:
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Copyright by Royal Astronomical Society. 2005MNRAS.362....2T Hot stars in old stellar populations: a continuing need for intermediate ages Trager, S. C.; Worthey, Guy; Faber, S. M.; Dressler, Alan Abstract. 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 H{beta} 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. Keywords: galaxies: clusters: individual: Coma, galaxies: elliptical and lenticular, cD, galaxies: stellar content
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