论文标题
$ \ sim $ 136,000 rr lyre lyae stars from gaia dr3的光度金属性和距离估计
Photometric metallicity and distance estimates for $\sim$ 136,000 RR Lyrae stars from Gaia DR3
论文作者
论文摘要
我们提供了135,873 RR Lyrae Star（RRLS）的样本，这些样本具有精确的光度 - 金属性和距离估算，我们从我们新校准的$ P-dist__ {31} -r_ {21} -R_ {21} - $ [Fe/H]/$ P-R_ {21} - $ p-R_ {21} - {21} - $ [Fe/H]和$ G $ G $ G $ band band band obsute Massute Massute Mertallectial-Metallectial-Metallal siltipal-Metallysility camentity cresidenty。 $ p-ϕ_ {31} -r_ {21} - $ [fe/h]和$ p-r_ {21} - $ [fe/h]类型RRAB和类型RRC星的关系是从近2700个Gaia识别的RRLS中获得的，具有精确的$ ϕ_ {31}} $ r_ {31} $ {21} $ {21} $ curves的curves和curves的curves和curves curves and curves。使用Gaia EDR3的视差测量，新的$ g $ band绝对幅度 - 金属关系和近红外的周期性量化幅度关系，使用236个具有准确距离的RRL，具有准确的距离。 External checks, using other high-resolution spectroscopic sample of field RRLs and RRL members of globular clusters (GCs), show that the typical uncertainties in our photometric-metallicity estimates are about 0.24 and 0.16 dex for type RRab/c stars, respectively, without significant systematic bias with respect to high-resolution spectroscopic metallicity measurements.与Gaia DR3释放相比，这些金属性估计值的准确性大大提高，尤其是对于RRAB恒星。再次使用GC的成员对距离估计的验证表明，典型的距离错误仅为3-4％。距离模量$μ_0= 18.503 \ pM0.001（stat）\ pm0.040（syst）$ mag for lmc，$μ_0= 19.030 \ pm0.003（stat）\ pm0.043（syst）$ smc的MAG估计了我们的rrab样品，以前估计了以前的rrab样品，并且很出色。这项工作中得出的LMC和SMC的平均金属性也与先前的确定一致。使用我们的样品，在LMC中找到了$ -0.024 \ pm0.001 $ dex/kpc $ -0.024 \ pm0.001的陡峭金属梯度，而SMC的金属梯度可忽略不计。
We present a sample of 135,873 RR Lyrae stars (RRLs) with precise photometric-metallicity and distance estimates from our newly calibrated $P-ϕ_{31}-R_{21}-$[Fe/H]/$P-R_{21}-$[Fe/H] and $G$ band absolute magnitude-metallicity relations. The $P-ϕ_{31}-R_{21}-$[Fe/H] and $P-R_{21}-$[Fe/H] relations for type RRab and type RRc stars are obtained from nearly 2700 Gaia-identified RRLs with precise $ϕ_{31}$ and $R_{21}$ measurements from the light curves and metallicity estimates from spectroscopy. Using 236 nearby RRLs with accurate distances estimated from parallax measurements with Gaia EDR3, new $G$ band absolute magnitude-metallicity relations and near-infrared period-absolute magnitude-metallicity relations are constructed. External checks, using other high-resolution spectroscopic sample of field RRLs and RRL members of globular clusters (GCs), show that the typical uncertainties in our photometric-metallicity estimates are about 0.24 and 0.16 dex for type RRab/c stars, respectively, without significant systematic bias with respect to high-resolution spectroscopic metallicity measurements. The accuracies of these metallicity estimates are much improved, especially for RRab stars, when compared to those provided by the Gaia DR3 release. Validations of our distance estimates, again by using members of GCs, show that the typical distance errors are only 3-4%. The distance modulus $μ_0=18.503\pm0.001(stat)\pm0.040(syst)$ mag for the LMC and $μ_0=19.030\pm0.003(stat)\pm0.043(syst)$ mag for the SMC are estimated from our RRab sample, respectively, and are in excellent agreement with previous measurements. The mean metallicities of the LMC and SMC derived in this work are also consistent with the previous determinations. Using our sample, a steep metallicity gradient of $-0.024\pm0.001$ dex/kpc is found for the LMC, while a negligible metallicity gradient is obtained for the SMC.
