Physical Parameters for RR Lyrae Stars in the SDSS Filter System
M. Catelan (1), G. I. Torrealba (1), C. Caceres (1,2), H. A. Smith, (3), N. De Lee (4), M. Fitzgerald (5) ((1) PUC-Chile, (2) Valparaiso, (3), Michigan State, (4) Vanderbilt, (5) Macquarie, Australia)
TL;DR
This paper calibrates physical parameters of RR Lyrae stars using SDSS photometry, employing synthetic horizontal branch models to derive high-precision analytical relations based on mean magnitudes and colors.
Contribution
It introduces a new calibration method for RR Lyrae physical parameters in the SDSS system using synthetic HB models that account for evolutionary effects.
Findings
High-precision analytical fits for metallicity, temperature, luminosity, gravity, mass, radius.
Calibration applicable across a wide range of metallicities and HB morphologies.
Provides a practical tool for deriving stellar parameters from SDSS data.
Abstract
We present a calibration of the metallicity and physical parameters (temperature, luminosity, gravity, mass, radius) for RR Lyrae stars using the ugriz SDSS photometric system. Our work is based on calculations of synthetic horizontal branches (HBs), fully taking into account evolutionary effects for a wide range in metallicities and HB morphologies. We provide analytical fits that are able to provide all quantities mentioned with very high (internal) precision, based solely on mean SDSS magnitudes and colors.
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