通过Wesenheit模板锚定通用距离尺度
Anchoring the Universal Distance Scale via a Wesenheit Template
摘要：
一个VI Wesenektum图具有SX Phoenekti，三角洲Scuti，RR天琴座，II型和经典的造父变星校准的几何为基础的距离推断从HST，依巴谷，VLBA观测（n=30）。到目标人口的距离是根据观测到的韦森星等与校准模板之间的偏移量得出的。通过确定LMC（μ_0 =18.43+-0.03 se）和球状星团omega Cen，M54，M13，M3，和M15的距离模来评价该方法。结果与文献中引用的估计一致，尽管更接近M13的距离是有利的（等待确认数据的光度零点），并且M15核心附近的变量观测受到光度污染。校准后的LMC数据随后被添加到Wesenektop模板中，因为该星系对不同类别的无数变量表现出精确的OGLE测光，其中包括最近对Scuti delta变量的观测，表明恒星遵循比经典造父变星更陡峭的VI Wesenektop函数。校准器的VI测光表以便于进一步研究，并包括通过AAVSO的机器人望远镜网络获得的新观测结果（例如，VY Pyx：<V>=7.25和<V>-<I>=0.67）。这里概述的方法取代了主要作者先前的一阶努力，以统一不稳定带的变量，以建立可靠的距离。
英文摘要：
A VI Wesenheit diagram featuring SX Phoenicis, delta Scuti, RR Lyrae, type II and classical Cepheid variables is calibrated by means of geometric-based distances inferred from HST, Hipparcos, and VLBA observations (n=30). The distance to a target population follows from the offset between the observed Wesenheit magnitudes and the calibrated template. The method is evaluated by ascertaining the distance moduli for the LMC (mu_0=18.43+-0.03 se) and the globular clusters omega Cen, M54, M13, M3, and M15. The results agree with estimates cited in the literature, although a nearer distance to M13 is favoured (pending confirmation of the data's photometric zero-point) and observations of variables near the core of M15 suffer from photometric contamination. The calibrated LMC data is subsequently added to the Wesenheit template since that galaxy exhibits precise OGLE photometry for innumerable variables of differing classes, that includes recent observations for delta Scuti variables indicating the stars follow a steeper VI Wesenheit function than classical Cepheids pulsating in the fundamental mode. VI photometry for the calibrators is tabulated to facilitate further research, and includes new observations acquired via the AAVSO's robotic telescope network (e.g., VY Pyx: <V>=7.25 and <V>-<I>=0.67). The approach outlined here supersedes the lead author's prior first-order effort to unify variables of the instability strip in order to establish reliable distances.
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