Standard Galactic field RR Lyrae II: a Gaia DR2 calibration of the period–Wesenheit–metallicity relation

Author:

Neeley Jillian R1ORCID,Marengo Massimo2,Freedman Wendy L3,Madore Barry F4,Beaton Rachael L45,Hatt Dylan3,Hoyt Taylor3,Monson Andrew J6,Rich Jeffrey A4,Sarajedini Ata1,Seibert Mark4,Scowcroft Victoria7ORCID

Affiliation:

1. Department of Physics, Florida Atlantic University, 777 Glades Rd, Boca Raton, FL 33431, USA

2. Department of Physics & Astronomy, Iowa State University, Ames, IA 50011, USA

3. Department of Astronomy & Astrophysics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USA

4. The Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101, USA

5. Department of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ 08544, USA

6. Department of Astronomy and Astrophysics, The Pennsylvania State University, 525 Davey Lab, University Park, PA 16802, USA

7. Department of Physics, University of Bath, Claverton Down, Bath BA2 7AY, UK

Abstract

ABSTRACT RR Lyrae stars have long been popular standard candles, but significant advances in methodology and technology have been made in recent years to increase their precision as distance indicators. We present multiwavelength (optical UBVRcIc and Gaia G, BP, RP; near-infrared JHKs; mid-infrared [3.6], [4.5]) period–luminosity–metallicity (PLZ), period–Wesenheit–metallicity (PWZ) relations, calibrated using photometry obtained from the Carnegie RR Lyrae Program and parallaxes from the Gaia second data release for 55 Galactic field RR Lyrae stars. The metallicity slope, which has long been predicted by theoretical relations, can now be measured in all passbands. The scatter in the PLZ relations is on the order of 0.2 mag, and is still dominated by uncertainties in the parallaxes. As a consistency check of our PLZ relations, we also measure the distance modulus to the globular cluster M4, the Large Magellanic Cloud and the Small Magellanic Cloud, and our results are in excellent agreement with estimates from previous studies.

Funder

National Science Foundation

European Space Agency

Jet Propulsion Laboratory

California Institute of Technology

NASA

Space Telescope Science Institute

Association of Universities for Research in Astronomy, Inc.

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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