2021ApJ...909..200B -
Astrophys. J., 909, 200-200 (2021/March-2)
RR Lyrae variables in Messier 53: near-infrared period-luminosity relations and the calibration using Gaia Early Data Release 3.
BHARDWAJ A., REJKUBA M., DE GRIJS R., YANG S.-C., HERCZEG G.J., MARCONI M., SINGH H.P., KANBUR S. and NGEOW C.-C.
Abstract (from CDS):
We present new near-infrared, JHKs, period-luminosity relations (PLRs) for RR Lyrae variables in the Messier 53 (M53 or NGC 5024) globular cluster. Multi-epoch JHKs 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 JHKs-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 Ks-band PLR, Ks=-2.303(0.063)logP+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, µM53 = 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 PLZKs_ relation, Ks=-0.848(0.007)-2.320(0.006)logP+0.166(0.011)[Fe/H], anchored with Gaia EDR3 distances and theoretically predicted relations, and to simultaneously estimate precise RR Lyrae-based distances to these globular clusters.
Abstract Copyright:
© 2021. The American Astronomical Society. All rights reserved.
Journal keyword(s):
RR Lyrae variable stars - Stellar pulsations - Globular star clusters - Distance indicators - Distance measure
Simbad objects:
71
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