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Metallicity of Galactic RR Lyrae from Optical and Infrared Light Curves. II. Period–Fourier–Metallicity Relations for First Overtone RR Lyrae

Journal Article · · The Astrophysical Journal
 [1];  [1];  [2];  [3];  [4];  [5];  [6];  [7];  [4];  [7];  [8];  [9];  [10];  [11]
  1. Iowa State Univ., Ames, IA (United States)
  2. National Optical-Infrared Astronomy Research (NOIR) Laboratory, Hilo, HI (United States); National Optical-Infrared Astronomy Research (NOIR) Laboratory (Chile)
  3. Tor Vergata Univ. of Rome (Italy); Istituto Nazionale di Astrofisica (INAF) (Italy)
  4. Istituto Nazionale di Astrofisica (INAF) (Italy); Italian Space Agency (ASI), Rome (Italy)
  5. Dartmouth College, Hanover, NH (United States)
  6. Tor Vergata Univ. of Rome (Italy); Istituto Nazionale di Astrofisica (INAF) (Italy); Univ. Federal do Rio Grande do Sul, Porto Alegre (Brazil)
  7. Istituto Nazionale di Astrofisica (INAF) (Italy)
  8. Institute of Astrophysics of the Canary Islands (Spain); Univ. of La Laguna (Spain)
  9. Florida Atlantic Univ., Boca Raton, FL (United States)
  10. National Research Council (Canada)
  11. University of Nice Sophia Antipolis (France); Centre National de la Recherche Scientifique (CNRS) (France)
+ Show Author Affiliations
We present new period-$$\phi$$31-[Fe/H] relations for first-overtone RRL stars (RRc), calibrated over a broad range of metallicities (–2.5 ≲ [Fe/H] ≲ 0.0) using the largest currently available set of Galactic halo field RRL with homogeneous spectroscopic metallicities. Our relations are defined in the optical (ASAS-SN V band) and, inaugurally, in the infrared (WISE W1 and W2 bands). Our V-band relation can reproduce individual RRc spectroscopic metallicities with a dispersion of 0.30 dex over the entire metallicity range of our calibrator sample (an rms smaller than what we found for other relations in literature including nonlinear terms). Our infrared relation has a similar dispersion in the low- and intermediate-metallicity range ([Fe/H] ≲ –0.5), but tends to underestimate the [Fe/H] abundance around solar metallicity. We tested our relations by measuring both the metallicity of the Sculptor dSph and a sample of Galactic globular clusters, rich in both RRc and RRab stars. The average metallicity we obtain for the combined RRL sample in each cluster is within ±0.08 dex of their spectroscopic metallicities. The infrared and optical relations presented in this work will enable deriving reliable photometric RRL metallicities in conditions where spectroscopic measurements are not feasible; e.g., in distant galaxies or reddened regions (observed with upcoming Extremely Large Telescopes and the James Webb Space Telescope), or in the large sample of new RRL that will be discovered in large-area time-domain photometric surveys (such as the LSST and the Roman space telescope).
Research Organization:
US Department of Energy (USDOE), Washington, DC (United States). Office of Science, Sloan Digital Sky Survey (SDSS); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC); Gordon and Betty Moore Foundation; National Science Foundation (NSF); Alfred P. Sloan Foundation
OSTI ID:
1983259
Journal Information:
The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 2 Vol. 931; ISSN 0004-637X
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
Globular star clusters
Metallicity
Pulsating variable stars
RR Lyrae variable stars
RRc variable stars