On the Use of Field RR Lyrae as Galactic Probes. V. Optical and radial velocity curve templates

Abstract

We collected the largest spectroscopic catalog of RR Lyrae (RRLs) including $\approx$20,000 high-, medium- and low-resolution spectra for $\approx$10,000 RRLs. We provide the analytical forms of radial velocity curve (RVC) templates. These were built using 36 RRLs (31 fundamental -- split into three period bins -- and 5 first overtone pulsators) with well-sampled RVCs based on three groups of metallic lines (Fe, Mg, Na) and four Balmer lines (H${}_{\alpha }$, H${}_{\beta }$, H${}_{\gamma }$, H${}_{\delta }$). We tackled the long-standing problem of the reference epoch to anchor light curve and RVC templates. For the $V$-band, we found that the residuals of the templates anchored to the phase of the mean magnitude along the rising branch are $\sim$35\% to $\sim$45\% smaller than those anchored to the phase of maximum light. For the RVC, we used two independent reference epochs for metallic and Balmer lines and we verified that the residuals of the RVC templates anchored to the phase of mean RV are from 30\% (metallic lines) up to 45\% (Balmer lines) smaller than those anchored to the phase of minimum RV. We validated our RVC templates by using both the single- and the three-phase points approach. We found that barycentric velocities based on our RVC templates are two-three times more accurate than those available in the literature. We applied the current RVC templates to Balmer lines RVs of RRLs in the globular NGC~3201 collected with MUSE at VLT. We found the cluster barycentric RV of $V_{\gamma }$=496.89$\pm$8.37(error)$\pm$3.43 (standard deviation) km/s, which agrees well with literature estimates.

References in corpus (66)

• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The Gaia mission
• The James Webb Space Telescope
• Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics Beyond LambdaCDM
• The Apache Point Observatory Galactic Evolution Experiment (APOGEE)
• First Results from the Catalina Real-time Transient Survey
• The merger that led to the formation of the Milky Way's inner stellar halo and thick disk
• SEGUE: A Spectroscopic Survey of 240,000 stars with g=14-20
• Wide-Field InfrarRed Survey Telescope-Astrophysics Focused Telescope Assets WFIRST-AFTA 2015 Report
• The Radial Velocity Experiment (RAVE): first data release
• Two Stellar Components in the Halo of the Milky Way
• Debris streams in the solar neighbourhood as relicts from the formation of the Milky Way
• Origin of the system of globular clusters in the Milky Way
• The GALAH Survey: Second Data Release
• The Fifteenth Data Release of the Sloan Digital Sky Surveys: First Release of MaNGA Derived Quantities, Data Visualization Tools and Stellar Library
• Horizontal Branch Stars: The Interplay between Observations and Theory, and Insights into the Formation of the Galaxy
• A Globular Cluster Metallicity Scale Based on the Abundance of Fe II
• The Milky Way stellar halo out to 40 kpc : Squashed, broken but smooth
• Proper motions and dynamics of the Milky Way globular cluster system from Gaia DR2
• The RR Lyrae Period-Luminosity Relation. I. Theoretical Calibration
• Light Curve Templates and Galactic Distribution of RR Lyrae Stars from Sloan Digital Sky Survey Stripe 82
• The Sausage Globular Clusters
• 4MOST - 4-metre Multi-Object Spectroscopic Telescope
• The Auriga Stellar Haloes: Connecting stellar population properties with accretion and merging history
• Deciphering the 3D structure of the old Galactic bulge from the OGLE RR Lyrae stars
• The Shape and Profile of the Milky Way Halo as Seen by the CFHT Legacy Survey
• Machine-Learned Identification of RR Lyrae Stars from Sparse, Multi-band Data: the PS1 Sample
• The ASAS-SN Catalog of Variable Stars III: Variables in the Southern TESS Continuous Viewing Zone
• A stellar census in globular clusters with MUSE: Binaries in NGC 3201
• A pulsational approach to near infrared and visual magnitudes of RR Lyrae stars
• The radial profile and flattening of the Milky Way's stellar halo to $80$kpc from the SEGUE K-giant Survey
• RR-Lyrae-type pulsations from a 0.26-solar-mass star in a binary system
• Optical and Near-Infrared UBVRIJHK Photometry for the RR Lyrae stars in the Nearby Globular Cluster M4 (NGC 6121)
• On the distance of the globular cluster M4 (NGC 6121) using RR Lyrae stars: I. optical and near-infrared Period-Luminosity and Period-Wesenheit relations
• The information content in cold stellar streams
• Weak Galactic halo--dwarf spheroidal connection from RR Lyrae stars
• The Chemical Compositions of Variable Field Horizontal Branch Stars: RR Lyrae Stars
• Revealing Substructure in the Galactic Halo - The SEKBO RR Lyrae Survey
• Metal Rich RR Lyrae Variables: II. The Pulsational Scenario
• Discovery of VVV CL001. A Low-Mass Globular Cluster Next to UKS~1 in the Direction of the Galactic Bulge
• MIKiS: the Multi-Instrument Kinematic Survey of Galactic Globular Clusters. I. Velocity dispersion profiles and rotation signals of 11 globular clusters
• On the RR Lyrae stars in globulars: IV. $\omega$ Centauri Optical UBVRI Photometry
• BVI time series data of the Galactic Globular Cluster NGC3201. I. RR Lyrae stars
• New NIR light-curve templates for classical Cepheids
• The Bulge Radial Velocity Assay for RR Lyrae stars (BRAVA-RR) DR2: a Bimodal Bulge?
• On the use of field RR Lyrae as Galactic probes: I. The Oosterhoff dichotomy based on fundamental variables
• On the Use of Field RR Lyrae as Galactic Probes. II. A new $\Delta$S calibration to estimate their metallicity
• Multiplicity of Galactic Cepheids and RR Lyrae stars from Gaia DR2 -- II. Resolved common proper motion pairs
• The Kinematic Properties of BHB and RR Lyrae stars towards the Anticentre and the North Galactic Pole: The Transition between the Inner and the Outer Halo
• Template RR Lyrae H alpha, H beta, and H gamma Velocity Curves
• Pulsation models for the 0.26M_sun star mimicking RR Lyrae pulsator. Model survey for the new class of variable stars
• The RRC Stars: Chemical Abundances and Envelope Kinematics
• Unmixing the Galactic Halo with RR Lyrae tagging
• Metallicity of Galactic RR Lyrae from Optical and Infrared Light Curves: I. Period-Fourier-Metallicity Relations for Fundamental Mode RR Lyrae
• Local RR Lyrae Stars: native and alien
• Evolutionary and pulsation properties of Type II Cepheids
• New Near-Infrared $JH{K}_s$ light-curve templates for RR Lyrae variables
• Chemical Compositions of Field and Globular Cluster RR Lyrae Stars: I. NGC 3201
• The dynamics of the globular cluster NGC3201 out to the Jacobi radius
• Structure and kinematics of Type II Cepheids in the Galactic bulge based on near-infrared VVV data
• On the separation between RR Lyrae and Type II Cepheids and their importance for distance determination: the case of $\omega$ Cen
• Identification of RR Lyrae stars in multiband, sparsely-sampled data from the Dark Energy Survey using template fitting and Random Forest classification
• HERBS I: Metallicity and alpha enhancement along the Galactic bulge minor axis
• Spinning like a Blue Straggler: the population of fast rotating Blue Straggler stars in Omega Centauri
• On the Metamorphosis of the Bailey diagram for RR Lyrae stars
• Spectroscopic and photometric time series of the bright RRc star T Sex

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• A Very Metal-poor RR Lyrae Star with a Disk Orbit Found in the Solar Neighborhood
• Rare Find: Discovery and chemo-dynamical properties of two s-process enhanced RR Lyrae stars
• On the Use of Field RR Lyrae as Galactic Probes -- VIII. Early Formation of the Galactic Spheroid
• IY Lyr: A Thick-Disk first-overtone RR Lyrae Star with a Possible Neutron Star Companion