利用化学性质奇特的恒星的精确年龄指示器
Precision age indicators that exploit chemically peculiar stars
摘要：
我们希望找到一种方法，以提高确定星系恒星形成历史的综合光谱。为此，在单星和非相互作用双星的正常演化过程中，出现了几类化学奇特（CP）星。一个老化的恒星星族有一段时间CP星对积分光有贡献，而另一段时间贡献消失。例如，HgMn恒星占据了10500到16000 K的狭窄温度范围，这映射到一个狭窄的年龄范围。沃尔夫-拉叶星、贫氦星、Bp-Ap星、Am-Fm星和C星在正常的恒星星族中，在0到几个Gyr之间的不同年龄变得非常常见，以类似于恒星光谱分类中使用的特征的方式淡入淡出。我们研究人口分数和光分数，以评估使用CP星作为年龄示踪剂的可行性。我们发现，即使CP星通常不占主导地位的数量，有足够的，使CP光谱特征是检测到高品质的综合光谱的年轻和中间年龄的恒星星族。新技术应该是可校准的和有用的。此外，使用CP签名作为年龄测定工具回避了对测光的依赖，测光容易受到灰尘和巴尔末特征的影响，容易受到星云填充的影响。
英文摘要：
We would like to find a way to improve the determination of galaxy star formation history from integrated light spectroscopy. To this end, several classes of chemically peculiar (CP) stars arise during the course of normal evolution in single stars and noninteracting binary stars. An aging stellar population has periods of time in which CP stars contribute to the integrated light, and others in which the contributions fade. The HgMn stars, for example, occupy a narrow temperature range of 10500 to 16000 K, which maps to a narrow range of ages. Wolf-Rayet stars, He-poor stars, Bp-Ap stars, Am-Fm stars, and C stars all become very common in a normal stellar population at various ages between zero and several Gyr, fading in and out in a way that is analogous to features used in stellar spectral classification. We examine population fractions and light fractions in order to assess the feasibility of using CP stars as age tracers. We find that, even though CP stars do not usually dominate in number, there are enough of them so that the CP spectral features are detectable in high-quality integrated spectra of young and intermediate age stellar populations. The new technique should be calibratable and useful. Furthermore, using CP signatures as age dating tools sidesteps reliance on photometry that is susceptible to dust and Balmer features that are susceptible to nebular fill-in.
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