深红外ZAMS适合托管delta Scuti恒星的基准疏散星团
Deep Infrared ZAMS Fits to Benchmark Open Clusters Hosting delta Scuti Stars
摘要：
这项研究的目的是确保集群三角洲盾座星系的精确距离，以便通过VI Weseneirs框架研究它们的属性。深JHKs颜色-颜色和ZAMS关系来自~700颗未变红的恒星，具有2 MASS测光和精确的HIP视差（d<~25 pc），用于确定到几个基准疏散星团的距离，这些星团是盾牌座δ的宿主：毕宿星团，昴宿星团，Praesepe，alpha Per和M67（d=47+-2，138 +-6，183 +-8，171 +-8，815 +-40 pc）。该分析提供了对δ Sct样本的绝对Weseneirs幅度（W_VI，0）、演化状态和脉动模式（阶数，n）的约束。通过与van Leeuwen 2009年修订的HIP结果进行比较，证明了JHK建立的聚类参数的可靠性。9个邻近星团（d<250 pc）中有7个的距离一致，而不一致的情况（Pleiades & Blanco 1）与随星团年龄或[Fe/H]的Te/J-Ks变化无关（无关紧要）。JHK测光表是根据自行（NOMAD）为~3x10^3个可能的星团成员编制的。深度JHKs测光扩展到低质量区域（~0.4 Msun），并确保精确（<5%）ZAMS拟合。脉动模式推断的集群三角洲盾从VI Wesenlavia和独立的分析是可比的（+-n），和方法是一致的，在确定更高的订单reflectors。大多数小振幅簇状三角洲盾叶甲位于VI Weseneirs基因座上，其特征是n>~1的突变子。通过一个通用的VI Weseneirs模板建立的从盾牌座三角洲到NGC 1817的距离（d~1.7 kpc）与文献中的估计一致，假设变量描绘了n>~1的边界。小的统计数据与其他因素一起，目前阻碍使用的mmag三角洲盾座作为可行的距离指标，以中年疏散星团，但第六Wesenektop的方法是一个相关的手段，研究三角洲盾座与其他方法相协调。
英文摘要：
This research aims to secure precise distances for cluster delta Scutis in order to investigate their properties via a VI Wesenheit framework. Deep JHKs colour-colour and ZAMS relations derived from ~700 unreddened stars featuring 2MASS photometry and precise HIP parallaxes (d<~25 pc) are applied to establish distances to several benchmark open clusters that host delta Scutis: Hyades, Pleiades, Praesepe, alpha Per, and M67 (d=47+-2,138+-6,183+-8,171+-8,815+-40 pc). That analysis provided constraints on the delta Sct sample's absolute Wesenheit magnitudes (W_VI,0), evolutionary status, and pulsation modes (order, n). The reliability of JHKs established cluster parameters is demonstrated via a comparison with van Leeuwen 2009 revised HIP results. Distances for 7 of 9 nearby (d<250 pc) clusters agree, and the discrepant cases (Pleiades & Blanco 1) are unrelated to (insignificant) Te/J-Ks variations with cluster age or [Fe/H]. JHKs photometry is tabulated for ~3x10^3 probable cluster members on the basis of proper motions (NOMAD). The deep JHKs photometry extends into the low mass regime (~0.4 Msun) and ensures precise (<5%) ZAMS fits. Pulsation modes inferred for the cluster delta Scutis from VI Wesenheit and independent analyses are comparable (+-n), and the methods are consistent in identifying higher order pulsators. Most small-amplitude cluster delta Scutis lie on VI Wesenheit loci characterizing n>~1 pulsators. A distance established to NGC 1817 from delta Scutis (d~1.7 kpc) via a universal VI Wesenheit template agrees with estimates in the literature, assuming the variables delineate the n>~1 boundary. Small statistics in tandem with other factors presently encumber the use of mmag delta Scutis as viable distance indicators to intermediate-age open clusters, yet a VI Wesenheit approach is a pertinent means for studying delta Scutis in harmony with other methods.
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