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The Galactic bulge exploration
Astronomy & Astrophysics ( IF 6.5 ) Pub Date : 2024-04-19 , DOI: 10.1051/0004-6361/202347338
Z. Prudil , A. Kunder , I. Dékány , A. J. Koch-Hansen

We present a new set of period–absolute magnitude–metallicity (PMZ) relations for single-mode RR Lyrae stars calibrated for the optical GBP, V, G, GRP, near-infrared I, J, H, and Ks passbands. We compiled a large dataset (over 100 objects) of fundamental and first-overtone RR Lyrae pulsators consisting of mean intensity magnitudes, reddenings, pulsation properties, iron abundances, and parallaxes measured by the Gaia astrometric satellite in its third data release. Our newly calibrated PMZ relations encapsulate the most up-to-date ingredients in terms of both data and methodology. They are intended to be used in conjunction with large photometric surveys targeting the Galactic bulge, including the Optical Gravitational Lensing Experiment (OGLE), the Vista Variables in the Vía Láctea Survey (VVV), and the Gaia catalog. In addition, our Bayesian probabilistic approach provides accurate uncertainty estimates of the predicted absolute magnitudes of individual RR Lyrae stars. Our derived PMZ relations provide consistent results when compared to benchmark distances to globular clusters NGC 6121 (also known as M 4), NGC 5139 (also known as omega Cen), and Large and Small Magellanic Clouds, which are stellar systems rich in RR Lyrae stars. Lastly, our Ks-band PMZ relations match well with the previously published PMZ relations based on Gaia data and accurately predict the distance toward the prototype of this class of variables, the eponymic RR Lyr itself.

中文翻译:

银河核球探索

我们提出了一组新的单模 RR Lyrae 星的周期-绝对星等-金属度 (PMZ) 关系,针对光学G BP V G G RP 、近红外I J HK s通带进行了校准。我们编制了一个大型数据集(超过 100 个物体),包含基本和第一泛音 RR Lyrae 脉动星,其中包括盖亚天体测量卫星在其第三次数据发布中测量的平均强度星等、红化、脉动特性、铁丰度和视差。我们新校准的 PMZ 关系在数据和方法方面都包含了最新的成分。它们旨在与针对银河核球的大型光度测量结合使用,包括光学引力透镜实验(OGLE)、Vía Láctea 巡天(VVV)中的 Vista 变量和盖亚目录。此外,我们的贝叶斯概率方法提供了对单个天琴座 RR 恒星的预测绝对星等的准确不确定性估计。与球状星团 NGC 6121(也称为 M 4)、NGC 5139(也称为 omega Cen)以及大麦哲伦星云(这些都是富含 RR Lyrae 的恒星系统)的基准距离相比,我们导出的 PMZ 关系提供了一致的结果星星。最后,我们的K s波段 PMZ 关系与之前发布的基于Gaia数据的 PMZ 关系很好地匹配,并准确预测了与此类变量的原型(同名的 RR Lyr 本身)的距离。
更新日期:2024-04-19
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