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http://hdl.handle.net/20.500.12386/31907
Titolo: | RR Lyrae Variables in Messier 53: Near-infrared Period-Luminosity Relations and the Calibration Using Gaia Early Data Release 3 | Autori: | BHARDWAJ, ANUPAM Rejkuba, Marina de Grijs, Richard Yang, Soung-Chul Herczeg, Gregory J. MARCONI, Marcella Singh, Harinder P. Kanbur, Shashi Ngeow, Chow-Choong |
Data pubblicazione: | 2021 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 909 | Fascicolo: | 2 | Da pagina:: | 200 | Abstract: | We present new near-infrared, JHK<SUB>s</SUB>, period-luminosity relations (PLRs) for RR Lyrae variables in the Messier 53 (M53 or NGC 5024) globular cluster. Multi-epoch JHK<SUB>s</SUB> 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 mode (RRc) variables. The JHK<SUB>s</SUB>-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<SUB>s</SUB>-band PLR, ${K}_{s}=-2.303(0.063)\mathrm{log}P+15.212(0.016)$ ,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 ± 3 μas in Gaia Early Data Release 3 (EDR3), which increases to 22 ± 2 μas if the parallax corrections are applied. We also estimate a robust distance modulus, μ<SUB>M53</SUB> = 16.403 ± 0.024 (statistical) ± 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 ${\mathrm{PLZ}}_{{K}_{s}}$ relation, ${K}_{s}=-0.848(0.007)\,-2.320(0.006)\mathrm{log}P+0.166(0.011)[\mathrm{Fe}/{\rm{H}}]$ ,anchored with Gaia EDR3 distances and theoretically predicted relations, and to simultaneously estimate precise RR Lyrae-based distances to these globular clusters. | URI: | http://hdl.handle.net/20.500.12386/31907 | URL: | https://api.elsevier.com/content/abstract/scopus_id/85103329523 https://iopscience.iop.org/article/10.3847/1538-4357/abdf48 |
ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/abdf48 | Bibcode ADS: | 2021ApJ...909..200B | Fulltext: | open |
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