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

Eckhart Spalding, Ronald Wilhelm, Nathan De Lee, Stacy Long, Timothy C. Beers, Vinicius M. Placco, John Kielkopf, Young Sun Lee, Joshua Pepper, Kenneth Carrell

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)828-845
Number of pages18
JournalMonthly Notices of the Royal Astronomical Society
Volume527
Issue number1
DOIs
StatePublished - Jan 1 2024

Bibliographical note

Publisher Copyright:
© 2023 The Author(s).

Keywords

  • RR Lyrae – Galaxy
  • halo
  • public release – stars
  • spectroscopic – software
  • techniques
  • variables

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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