TY - JOUR
T1 - Zwicky Transient Facility and Globular Clusters
T2 - The RR Lyrae gri-band Period-Luminosity-Metallicity and Period-Wesenheit-Metallicity Relations
AU - Ngeow, Chow Choong
AU - Bhardwaj, Anupam
AU - Dekany, Richard
AU - Duev, Dmitry A.
AU - Graham, Matthew J.
AU - Groom, Steven L.
AU - Mahabal, Ashish A.
AU - Masci, Frank J.
AU - Medford, Michael S.
AU - Riddle, Reed
N1 - Publisher Copyright:
© 2022. The Author(s). Published by the American Astronomical Society.
PY - 2022
Y1 - 2022
N2 - Based on time-series observations collected from the Zwicky Transient Facility (ZTF), we derived period-luminosity-metallicity (PLZ) and period-Wesenheit-metallicity (PWZ) relations for RR Lyrae located in globular clusters. We have applied various selection criteria to exclude RR Lyrae with problematic or spurious light curves. These selection criteria utilized information on the number of data points per light curve, amplitudes, colors, and residuals on the period-luminosity and/or period-Wesenheit relations. Due to blending, a number of RR Lyrae in globular clusters were found to be anomalously bright and have small amplitudes of their ZTF light curves. We used our final sample of ∼750 RR Lyrae in 46 globular clusters covering a wide metallicity range (-2.36 dex < [Fe/H] < -0.54 dex) to derive PLZ and PWZ relations in the gri bands. In addition, we have also derived the period-color-metallicity and, for the first time, the period-Q-index-metallicity relations, where the Q-index is extinction-free by construction. We have compared our various relations to empirical and theoretical relations available in the literature and found a good agreement with most studies. Finally, we applied our derived PLZ relation to a dwarf galaxy, Crater II, and found that its true distance modulus should be larger than the most recent determination.
AB - Based on time-series observations collected from the Zwicky Transient Facility (ZTF), we derived period-luminosity-metallicity (PLZ) and period-Wesenheit-metallicity (PWZ) relations for RR Lyrae located in globular clusters. We have applied various selection criteria to exclude RR Lyrae with problematic or spurious light curves. These selection criteria utilized information on the number of data points per light curve, amplitudes, colors, and residuals on the period-luminosity and/or period-Wesenheit relations. Due to blending, a number of RR Lyrae in globular clusters were found to be anomalously bright and have small amplitudes of their ZTF light curves. We used our final sample of ∼750 RR Lyrae in 46 globular clusters covering a wide metallicity range (-2.36 dex < [Fe/H] < -0.54 dex) to derive PLZ and PWZ relations in the gri bands. In addition, we have also derived the period-color-metallicity and, for the first time, the period-Q-index-metallicity relations, where the Q-index is extinction-free by construction. We have compared our various relations to empirical and theoretical relations available in the literature and found a good agreement with most studies. Finally, we applied our derived PLZ relation to a dwarf galaxy, Crater II, and found that its true distance modulus should be larger than the most recent determination.
UR - http://www.scopus.com/inward/record.url?scp=85130140477&partnerID=8YFLogxK
U2 - 10.3847/1538-3881/ac617e
DO - 10.3847/1538-3881/ac617e
M3 - 期刊論文
AN - SCOPUS:85130140477
SN - 0004-6256
VL - 163
JO - Astronomical Journal
JF - Astronomical Journal
IS - 5
M1 - 239
ER -