Zwicky Transient Facility and Globular Clusters: The RR Lyrae gri-Band Period-Luminosity-Metallicity and Period-Wesenheit-Metallicity Relations

Abstract

Based on time-series observations collected from 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 < [Fe/H] < -0.54 dex) to derive PLZ and PWZ relations in gri bands. In addition, we have also derived the period-color-metallicity (PCZ) and for the first time, the PQZ relations where the Q-index is extinction-free by construction. We have compared our various relations to empirical and theoretical relations available in literature, and found a good agreement with most studies. Finally, we applied our derived PLZ relation to a dwarf galaxy, Crater II, and found its true distance modulus should be larger than the most recent determination.

arXiv comment28 pages, 7 Tables and 24 Figures. AJ accepted

References in corpus (64)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Array Programming with NumPy
• Astropy: A Community Python Package for Astronomy
• emcee: The MCMC Hammer
• Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
• LSST: from Science Drivers to Reference Design and Anticipated Data Products
• Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant
• The Zwicky Transient Facility: System Overview, Performance, and First Results
• A 3D Dust Map Based on Gaia, Pan-STARRS 1 and 2MASS
• The WASP Project and the SuperWASP Cameras
• The Zwicky Transient Facility: Data Processing, Products, and Archive
• ATLAS: A High-Cadence All-Sky Survey System
• The All-Sky Automated Survey for Supernovae (ASAS-SN) Light Curve Server v1.0
• The Hyper Suprime-Cam SSP Survey: Overview and Survey Design
• The Dark Energy Camera
• The Dark Energy Survey: more than dark energy - an overview
• The Pan-STARRS1 Photometric System
• The Zwicky Transient Facility: Science Objectives
• Variable Stars in Galactic Globular Clusters
• Accurate distances to Galactic globular clusters through a combination of Gaia EDR3, HST and literature data
• A First Catalog of Variable Stars Measured by the Asteroid Terrestrial-impact Last Alert System (ATLAS)
• The Dark Energy Survey Data Release 2
• The Zwicky Transient Facility: Observing System
• A Comparison of Elemental Abundance Ratios in Globular Clusters, Field Stars, and Dwarf Spheroidal Galaxies
• The RR Lyrae Period-Luminosity Relation. I. Theoretical Calibration
• Periodograms for Multiband Astronomical Time Series
• Probing the Outer Galactic halo with RR Lyrae from the Catalina Surveys
• The feeble giant. Discovery of a large and diffuse Milky Way dwarf galaxy in the constellation of Crater
• Light Curve Templates and Galactic Distribution of RR Lyrae Stars from Sloan Digital Sky Survey Stripe 82
• On a new theoretical framework for RR Lyrae stars I: the metallicity dependence
• Machine-Learned Identification of RR Lyrae Stars from Sparse, Multi-band Data: the PS1 Sample
• A pulsational approach to near infrared and visual magnitudes of RR Lyrae stars
• RR Lyrae stars as standard candles in the Gaia Data Release 2 Era
• Crater 2: An Extremely Cold Dark Matter Halo
• Pan-STARRS Pixel Analysis : Source Detection and Characterization
• The RR Lyrae Period - K Luminosity relation for Globular Clusters: an observational approach
• FORS2/VLT survey of Milky Way globular clusters II. Fe and Mg abundances of 51 Milky Way globular clusters on a homogeneous scale
• Theoretical insights into the RR Lyrae K-band Period-Luminosity relation
• Old-Aged Stellar Population Distance Indicators
• RR Lyrae stars in Galactic globular clusters. II. A theoretical approach to variables in M3
• The RR Lyrae variables and Horizontal Branch of NGC6656 (M22)
• On the RR Lyrae stars in globulars: IV. $\omega$ Centauri Optical UBVRI Photometry
• On a new theoretical framework for RR Lyrae stars II: Mid--Infrared Period--Luminosity--Metallicity Relations
• Standard Galactic Field RR Lyrae II: A Gaia DR2 calibration of the period-Wesenheit-metallicity relation
• Large Magellanic Cloud Near-Infrared Synoptic Survey. II. The Wesenheit relations and their application to the Distance scale
• The unblinking eye on the sky
• The Period-Luminosity Relation of RR Lyrae Stars in the SDSS Photometric System
• The Accuracy of the Hubble Constant Measurement Verified through Cepheid Amplitudes
• High-precision distance measurements with classical pulsating stars
• Dynamical Histories of the Crater II and Hercules Dwarf Galaxies
• Homogeneous metallicities and radial velocities for Galactic globular clusters. II. New CaT metallicities for 28 distant and reddened globular clusters
• Ancient stars beyond the Local Group: RR Lyrae variables and Blue Horizontal Branch stars in Sculptor Group Dwarf Galaxies
• Multicolour CCD photometry of the variable stars in globular cluster M3
• FORS2/VLT survey of Milky Way globular clusters I. Description of the method for derivation of metal abundances in the optical and application to NGC 6528, NGC 6553, M 71, NGC 6558, NGC 6426 and Terzan 8
• Mid-infrared PL relations for Globular Cluster RR Lyrae
• A DECam View of the Diffuse Dwarf Galaxy Crater II: Variable Stars
• Absolute Magnitudes and Colors of RR Lyrae stars in DECam Passbands from Photometry of the Globular Cluster M5
• Data boundary fitting using a generalised least-squares method
• Quantifying the Smoothness of the Stellar Halo: A Link to Accretion History
• Predicted properties of RR Lyrae stars in the SDSS photometric system
• RR Lyrae Variable Stars in the Crater II Dwarf Galaxy
• Near-infrared Census of RR Lyrae variables in the Messier 3 globular cluster and the Period--Luminosity Relations
• A DECam View of the Diffuse Dwarf Galaxy Crater II: The Colour-Magnitude Diagram
• Zwicky Transient Facility and Globular Clusters: the Period-Luminosity and Period-Luminosity-Color Relations for Late-Type Contact Binaries

Cited by in corpus (1)

• Evaluating the V-band Photometric Metallicity with Fundamental Mode RR Lyrae in the Kepler Field