论文标题
Messier 3球形群集和周期关系的RR Lyre变量的近红外人口普查
Near-infrared Census of RR Lyrae variables in the Messier 3 globular cluster and the Period--Luminosity Relations
论文作者
论文摘要
我们在Messier 3（NGC 5272）中使用WIRCAM仪器在3.6 m Canada France France France France夏威夷望远镜中提出了新的近红外（$ JHK_S $）RR LYRAE变量的时间序列观测。我们的观察结果涵盖了$ \ sim 21'\ times 21'$周围的天空面积，平均提供了20个同质时代的均质$ JHK_S $ -BAND光度法。新的均质光度法用于估计175个基本模式（RRAB），47个夸张模式（RRC）和11个混合模式（RRD）变量的鲁棒平均幅度。我们的233 RR Lyrae变量的样本是迄今为止在单个群集中获得的最大的，具有时间分辨，多波段的近红外光度法。 Messier 3中RR Lyrae的近红外与光振幅比率从RRC到短期（$ P <0.6 $〜天）和长期（$ P \ gtrsim 0.6 $〜天）RRAB变量。我们得出了$ jhk_s $ - band周期 - rrab，rrc和变量的组合样本。 Absolute calibrations based on the theoretically predicted Period--Luminosity--Metallicity relations for RR Lyrae stars yield a distance modulus, $μ= 15.041 \pm 0.017~(\textrm{statistical}) \pm 0.036~(\textrm{systematic})$~mag, to Messier 3. When anchored to trigonometric parallaxes for nearby RR从{\ it Hubble太空望远镜}和{\ it Gaia}任务中的Lyrae星星，我们的距离估计与由理论校准产生的距离一致，尽管具有相对较大的系统不确定性。
We present new near-infrared ($JHK_s$) time-series observations of RR Lyrae variables in the Messier 3 (NGC 5272) globular cluster using the WIRCam instrument at the 3.6-m Canada France Hawaii Telescope. Our observations cover a sky area of $\sim 21'\times 21'$ around the cluster center and provide an average of twenty epochs of homogeneous $JHK_s$-band photometry. New homogeneous photometry is used to estimate robust mean magnitudes for 175 fundamental-mode (RRab), 47 overtone-mode (RRc), and 11 mixed-mode (RRd) variables. Our sample of 233 RR Lyrae variables is the largest thus far obtained in a single cluster with time-resolved, multi-band near-infrared photometry. Near-infrared to optical amplitude ratios for RR Lyrae in Messier 3 exhibit a systematic increase moving from RRc to short-period ($P < 0.6$~days) and long-period ($P \gtrsim 0.6$~days) RRab variables. We derive $JHK_s$-band Period--Luminosity relations for RRab, RRc, and the combined sample of variables. Absolute calibrations based on the theoretically predicted Period--Luminosity--Metallicity relations for RR Lyrae stars yield a distance modulus, $μ= 15.041 \pm 0.017~(\textrm{statistical}) \pm 0.036~(\textrm{systematic})$~mag, to Messier 3. When anchored to trigonometric parallaxes for nearby RR Lyrae stars from the {\it Hubble Space Telescope} and the {\it Gaia} mission, our distance estimates are consistent with those resulting from the theoretical calibrations, albeit with relatively larger systematic uncertainties.
