rrlfe: software for generating and applying metallicity calibrations for RR Lyrae variable stars across a wide range of phases and temperatures

Author:

Spalding Eckhart12ORCID,Wilhelm Ronald3,De Lee Nathan45ORCID,Long Stacy6ORCID,Beers Timothy C27ORCID,Placco Vinicius M8ORCID,Kielkopf John9ORCID,Lee Young Sun210ORCID,Pepper Joshua11ORCID,Carrell Kenneth12ORCID

Affiliation:

1. Sydney Institute for Astronomy, School of Physics, The University of Sydney , Sydney, NSW 2006 , Australia

2. Department of Physics and Astronomy, University of Notre Dame , 225 Nieuwland Science Hall, Notre Dame, IN 46556 , USA

3. Department of Physics and Astronomy, University of Kentucky , Lexington, KY 40506 , USA

4. Department of Physics, Geology, and Engineering Technology, Northern Kentucky University , Highland Heights, KY 41099 , USA

5. Department of Physics and Astronomy, Vanderbilt University , 301 Stevenson Center Ln., Nashville, TN 37235 , USA

6. Department of Chemistry and Physics, Lincoln Memorial University , Harrogate, TN 37752 , USA

7. JINA Center for the Evolution of the Elements, University of Notre Dame , 225 Nieuwland Science Hall, Notre Dame, IN 46556 , USA

8. NSF’s NOIRLab , Tucson, AZ 85719 , USA

9. Department of Physics and Astronomy, University of Louisville , Louisville, KY 40292 , USA

10. Department of Astronomy and Space Science, Chungnam National University , Daejeon 34134 , Republic of Korea

11. Department of Physics, Lehigh University , Bethlehem, PA 18015 , USA

12. Department of Physics and Geosciences, Angelo State University , San Angelo, TX 76909 , USA

Abstract

ABSTRACT RR Lyrae stars play a central role in tracing phase-space structures within the Milky Way because they are easy to identify, are relatively luminous, and are found in large numbers in the Galactic bulge, disc, and halo. In this work, we present a new set of spectroscopic metallicity calibrations that use the equivalent widths of the Ca ii K and Balmer H γ and H δ lines to calculate metallicity values from low-resolution spectra. This builds on an earlier calibration from Layden by extending the range of equivalent widths which map between Ca ii K and the Balmer lines. We have developed the software rrlfe to apply this calibration to spectra in a consistent, reproducible, and extensible manner. This software is open-source and available to the community. The calibration can be updated with additional data sets in the future.

Funder

National Science Foundation

NRF

National Aeronautics and Space Administration

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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