论文标题
障碍物：贝叶斯年龄的低质量星星
BAFFLES: Bayesian Ages for Field Lower-Mass Stars
论文作者
论文摘要
年龄是恒星的基本参数，但在许多情况下，出现了单个恒星的年龄，而没有对不确定性的强大估计。我们已经开发了一个贝叶斯框架，挡板，以从其钙排放强度（log（$ r'_ {hk} $））或丰富锂（li ew）和$ b-v $颜色中产生恒星的年龄。我们从经验上确定了钙和锂的可能性功能作为年龄的功能，这些功能来自具有确定年龄良好的基准簇中恒星的文献测量值。我们使用统一的年龄，反映了均匀的恒星形成率。我们为几个测试案例得出的年龄后代与从其他方法中发现的文献年龄一致。障碍物代表了一种可靠的方法，可以确定任何售价0.45 \ leq b-v \ leq 0.9 $的年龄后概率分布，并测量$ r'_ _ {hk} $和/或$ 0.35 \ leq b-v \ leq b-v \ leq leq 1.9 $ 1.9 $和测量的li ew。我们收集颜色，$ r'_ {hk} $，以及来自文献的2630多个野外星星的李ew，并呈现每个恒星的派生式挡板年龄。
Age is a fundamental parameter of stars, yet in many cases ages of individual stars are presented without robust estimates of the uncertainty. We have developed a Bayesian framework, BAFFLES, to produce the age posterior for a star from its calcium emission strength (log($R'_{HK}$)) or lithium abundance (Li EW) and $B-V$ color. We empirically determine the likelihood functions for calcium and lithium as functions of age from literature measurements of stars in benchmark clusters with well-determined ages. We use a uniform prior on age which reflects a uniform star formation rate. The age posteriors we derive for several test cases are consistent with literature ages found from other methods. BAFFLES represents a robust method to determine the age posterior probability distribution for any field star with $0.45 \leq B-V \leq 0.9$ and a measurement of $R'_{HK}$ and/or $0.35 \leq B-V \leq 1.9$ and measured Li EW. We compile colors, $R'_{HK}$, and Li EW from over 2630 nearby field stars from the literature and present the derived BAFFLES age posterior for each star.
