标题： 古老星族中的热星：中间年龄的持续需求 显示英文标题

标题： Hot Stars in Old Stellar Populations: A Continuing Need for Intermediate Ages

摘要： 我们研究了少量炽热、古老、金属贫乏的恒星光污染对后发座星系团核心处早期类型星系推断出的恒星群体的影响。 我们发现，对于古老、金属贫乏的恒星，修正其Hβ和金属吸收线强度时，并不会显著影响推断出的恒星群体年龄，前提是Hβ强度较大。 因此，为了说明早期类型星系中增强的Hα线强度，仍然需要中间年龄的恒星群体。 这使我们对我们这些天体的年龄估计更有信心。 然而，对于对应于非常古老群体（t>10 Gyr）且具有弱Hβ线强度的星系，先前建议的炽热恒星修正确实可能改变推断出的年龄。 最后，在任何针对古老、金属贫乏恒星光污染的修正后，推断出的金属丰度[Z/H]总是会更高，但增强比[E/Fe]只会略微加强。 显示英文摘要

摘要： We investigate the effect of a small 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 Hbeta 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 without, but the enhancement ratios [E/Fe] will strengthen only slightly.