论文标题
Messier 53中的RR Lyrae变量：近红外时期 - 亮度关系和使用Gaia早期数据版本3的校准3
RR Lyrae variables in Messier 53: Near-infrared Period--Luminosity relations and the calibration using Gaia Early Data Release 3
论文作者
论文摘要
我们提出了新的近红外，$ jhk_s $，在Messier 53（M53或NGC 5024）中的RR Lyrae变量的时期 - luminosity关系（PLR）。通过WIRCAM仪器在3.6 m加拿大法国夏威夷望远镜上获得的多上皮$ jhk_s $观测值首次使用M53中63个RR Lyrae Stars的精确平均值估算，包括29个RR Lyrae Stars的精确平均值，包括29个基本模式（RRAB）和34个First-First-Offertove Modes（RRC）（RRC）Variables。 RR Lyre恒星的$ JHK_S $ -BAND PLR对RRAB类型的限制最少，分别为22、23和19 mmag。 RR Lyre的组合样品用于得出$ k_s $ -band plr，$ k_s = -2.303（0.063）\ log P + 15.212（0.016）$显示出$1σ$散布的$ 0.027 $ MAG。理论时期 - 轻度 - 金属性（PLZ）的关系用于预测400个银河系RR lyae的视差，导致中位数零点的零点偏移为$ -7 \ pm3〜μ $，如{\ it gaia}早期数据发行3（EDR3）中的{\ it gaia}中的早期数据3（EDR3），这增加到了$ 22 \ pm2〜 $ 22 \ pm2〜 $ $ 22〜 $ 22 \ $ 22 \ $ 22 \ pm2〜m.我们还估计了一个强大的距离模量，$μ__\ textrm {m53} = 16.403 \ pm 0.024 $（统计）$ \ pm 0.033 $（系统）mag，基于理论校准。 M53中RR Lyre的同质和精确的平均值以及M3，M4，M5和$ω$ CEN的类似文献数据用于经验校准新的Rr lyae plz $ _ {k_s} $关系，$ k_s = -0.848（0.007）-2.320（0.007）-2.320（0.006）-2.320（0.007） {\ rm [fe/h]} $，以{\ it gaia} EDR3距离和理论上预测的关系锚定，同时估计基于这些球形群集的精确rr lyrae距离。
We present new near-infrared, $JHK_s$, Period--Luminosity relations (PLRs) for RR Lyrae variables in the Messier 53 (M53 or NGC 5024) globular cluster. Multi-epoch $JHK_s$ observations, obtained with the WIRCam instrument on the 3.6-m Canada France Hawaii Telescope, are used for the first time to estimate precise mean-magnitudes for 63 RR Lyrae stars in M53 including 29 fundamental-mode (RRab) and 34 first-overtone modes (RRc) variables. The $JHK_s$-band PLRs for RR Lyrae stars are best constrained for RRab types with a minimal scatter of 22, 23, and 19 mmag, respectively. The combined sample of RR Lyrae is used to derive the $K_s$-band PLR, $K_s = -2.303 (0.063) \log P + 15.212 (0.016)$ exhibiting a $1σ$ dispersion of only $0.027$ mag. Theoretical Period--Luminosity--Metallicity (PLZ) relations are used to predict parallaxes for 400 Galactic RR Lyrae resulting in a median parallax zero-point offset of $-7\pm3~μ$as in {\it Gaia} Early Data Release 3 (EDR3), which increases to $22\pm2~μ$as if the parallax corrections are applied. We also estimate a robust distance modulus, $μ_\textrm{M53} = 16.403 \pm 0.024$ (statistical) $\pm 0.033$ (systematic) mag, to M53 based on theoretical calibrations. Homogeneous and precise mean-magnitudes for RR Lyrae in M53 together with similar literature data for M3, M4, M5, and $ω$ Cen are used to empirically calibrate a new RR Lyrae PLZ$_{K_s}$ relation, $K_s = -0.848 (0.007) -2.320 (0.006) \log P + 0.166 (0.011) {\rm[Fe/H]}$, anchored with {\it Gaia} EDR3 distances and theoretically predicted relations, and simultaneously estimate precise RR Lyrae based distances to these globular clusters.
