Standard Galactic field RR Lyrae II: a Gaia DR2 calibration of the period–Wesenheit–metallicity relation
Standard Galactic field RR Lyrae II: a Gaia DR2 calibration of the period–Wesenheit–metallicity relation
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DOI：
10.1093/mnras/stz2814
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发表时间：
2019-10
影响因子：
4.8
通讯作者：
J. Neeley;M. Marengo;W. Freedman;B. Madore;R. Beaton;D. Hatt;Taylor J. Hoyt;A. Monson;J. Rich;A. Sarajedini;M. Seibert;V. Scowcroft
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文献类型：
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作者：
J. Neeley;M. Marengo;W. Freedman;B. Madore;R. Beaton;D. Hatt;Taylor J. Hoyt;A. Monson;J. Rich;A. Sarajedini;M. Seibert;V. Scowcroft
天琴座RR型星长期以来一直是流行的标准烛光，但近年来在方法和技术方面取得了重大进展，以提高其作为距离指示器的精度。我们提供了多波长（光学UBVRcIc和Gaia G，BP，RP;近红外JHK;中红外[3.6]，[4.5]）周期光度-金属丰度（PLZ），周期-Wesenfeld-金属丰度（PWZ）关系，使用从卡内基RR Lyrics计划获得的测光和来自Gaia的55颗银河场RR Lyrics星的第二次数据发布进行校准。金属丰度斜率，这一直是预测的理论关系，现在可以在所有通带测量。在PLZ关系的分散是在0.2等的顺序，并仍然是由不确定性的不确定性的控制。作为我们的PLZ关系的一致性检查，我们还测量了球状星团M4，大麦哲伦云和小麦哲伦云的距离模量，我们的结果是在极好的协议从以前的研究估计。
RR Lyrae stars have long been popular standard candles, but significant advances in methodology and technology have been made in recent years to increase their precision as distance indicators. We present multiwavelength (optical UBVRcIc and Gaia G, BP, RP; near-infrared JHKs; mid-infrared [3.6], [4.5]) period–luminosity–metallicity (PLZ), period–Wesenheit–metallicity (PWZ) relations, calibrated using photometry obtained from the Carnegie RR Lyrae Program and parallaxes from the Gaia second data release for 55 Galactic field RR Lyrae stars. The metallicity slope, which has long been predicted by theoretical relations, can now be measured in all passbands. The scatter in the PLZ relations is on the order of 0.2 mag, and is still dominated by uncertainties in the parallaxes. As a consistency check of our PLZ relations, we also measure the distance modulus to the globular cluster M4, the Large Magellanic Cloud and the Small Magellanic Cloud, and our results are in excellent agreement with estimates from previous studies.