Standard Galactic Field RR Lyrae II: A Gaia DR2 calibration of the period-Wesenheit-metallicity relation

Jillian R. Neeley; Massimo Marengo; Wendy L. Freedman; Barry F. Madore; Rachael L. Beaton; Dylan Hatt; Andrew J. Monson; Jeffrey A. Rich; Ata Sarajedini; Mark Seibert; Victoria Scowcroft

doi:10.1093/mnras/stz2814

Standard Galactic Field RR Lyrae II: A Gaia DR2 calibration of the period-Wesenheit-metallicity relation

Jillian R. Neeley, Massimo Marengo, Wendy L. Freedman, Barry F. Madore, Rachael L. Beaton, Dylan Hatt, Andrew J. Monson, Jeffrey A. Rich, Ata Sarajedini, Mark Seibert, Victoria Scowcroft

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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 multi-wavelength (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 (LMC) and the Small Magellanic Cloud (SMC), and our results are in excellent agreement with estimates from previous studies.

Original language	English
Article number	stz2814
Pages (from-to)	4254–4270
Number of pages	18
Journal	Monthly Notices of the Royal Astronomical Society
Volume	490
Issue number	3
Early online date	9 Oct 2019
DOIs	https://doi.org/10.1093/mnras/stz2814
Publication status	Published - 31 Dec 2019

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Neeley, J. R., Marengo, M., Freedman, W. L., Madore, B. F., Beaton, R. L., Hatt, D., Monson, A. J., Rich, J. A., Sarajedini, A., Seibert, M., & Scowcroft, V. (2019). Standard Galactic Field RR Lyrae II: A Gaia DR2 calibration of the period-Wesenheit-metallicity relation. Monthly Notices of the Royal Astronomical Society, 490(3), 4254–4270. Article stz2814. https://doi.org/10.1093/mnras/stz2814

Neeley, JR, Marengo, M, Freedman, WL, Madore, BF, Beaton, RL, Hatt, D, Monson, AJ, Rich, JA, Sarajedini, A, Seibert, M & Scowcroft, V 2019, 'Standard Galactic Field RR Lyrae II: A Gaia DR2 calibration of the period-Wesenheit-metallicity relation', Monthly Notices of the Royal Astronomical Society, vol. 490, no. 3, stz2814, pp. 4254–4270. https://doi.org/10.1093/mnras/stz2814

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title = "Standard Galactic Field RR Lyrae II: A Gaia DR2 calibration of the period-Wesenheit-metallicity relation",

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 multi-wavelength (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 (LMC) and the Small Magellanic Cloud (SMC), and our results are in excellent agreement with estimates from previous studies.",

author = "Neeley, {Jillian R.} and Massimo Marengo and Freedman, {Wendy L.} and Madore, {Barry F.} and Beaton, {Rachael L.} and Dylan Hatt and Monson, {Andrew J.} and Rich, {Jeffrey A.} and Ata Sarajedini and Mark Seibert and Victoria Scowcroft",

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T1 - Standard Galactic Field RR Lyrae II: A Gaia DR2 calibration of the period-Wesenheit-metallicity relation

AU - Neeley, Jillian R.

AU - Marengo, Massimo

AU - Freedman, Wendy L.

AU - Madore, Barry F.

AU - Beaton, Rachael L.

AU - Hatt, Dylan

AU - Monson, Andrew J.

AU - Rich, Jeffrey A.

AU - Sarajedini, Ata

AU - Seibert, Mark

AU - Scowcroft, Victoria

PY - 2019/12/31

Y1 - 2019/12/31

N2 - 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 multi-wavelength (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 (LMC) and the Small Magellanic Cloud (SMC), and our results are in excellent agreement with estimates from previous studies.

AB - 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 multi-wavelength (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 (LMC) and the Small Magellanic Cloud (SMC), and our results are in excellent agreement with estimates from previous studies.

U2 - 10.1093/mnras/stz2814

DO - 10.1093/mnras/stz2814

M3 - Article

SN - 0035-8711

VL - 490

SP - 4254

EP - 4270

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

M1 - stz2814

ER -

Standard Galactic Field RR Lyrae II: A Gaia DR2 calibration of the period-Wesenheit-metallicity relation

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