On a New Theoretical Framework for RR Lyrae Stars. II. Mid-infrared Period-Luminosity-Metallicity Relations

Jillian R. Neeley, Massimo Marengo, Giuseppe Bono, Vittorio F. Braga, Massimo Dall'ora, Davide Magurno, Marcella Marconi, Nicolas Trueba, Emanuele Tognelli, Pier G.Prada Moroni, Rachael L. Beaton, Wendy L. Freedman, Barry F. Madore, Andrew Monson, Victoria Scowcroft, Mark Seibert, Peter B. Stetson

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

We present new theoretical period-luminosity-metallicity (PLZ) relations for RR Lyræ stars (RRLs) at Spitzer and WISE wavelengths. The PLZ relations were derived using nonlinear, time-dependent convective hydrodynamical models for a broad range of metal abundances (Z = 0.0001-0.0198). In deriving the light curves, we tested two sets of atmospheric models and found no significant difference between the resulting mean magnitudes. We also compare our theoretical relations to empirical relations derived from RRLs in both the field and in the globular cluster M4. Our theoretical PLZ relations were combined with multi-wavelength observations to simultaneously fit the distance modulus, μ 0, and extinction, A V, of both the individual Galactic RRL and of the cluster M4. The results for the Galactic RRL are consistent with trigonometric parallax measurements from Gaia's first data release. For M4, we find a distance modulus of μ 0 = 11.257 ± 0.035 mag with A V = 1.45 ± 0.12 mag, which is consistent with measurements from other distance indicators. This analysis has shown that, when considering a sample covering a range of iron abundances, the metallicity spread introduces a dispersion in the PL relation on the order of 0.13 mag. However, if this metallicity component is accounted for in a PLZ relation, the dispersion is reduced to ∼0.02 mag at mid-infrared wavelengths.

Original languageEnglish (US)
Article number84
JournalAstrophysical Journal
Volume841
Issue number2
DOIs
StatePublished - Jun 1 2017

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metallicity
luminosity
wavelength
stars
wavelengths
Wide-field Infrared Survey Explorer
atmospheric models
parallax
globular clusters
extinction
light curve
iron
coverings
metal
metals
indicator
analysis
atmospheric model

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Neeley, J. R., Marengo, M., Bono, G., Braga, V. F., Dall'ora, M., Magurno, D., ... Stetson, P. B. (2017). On a New Theoretical Framework for RR Lyrae Stars. II. Mid-infrared Period-Luminosity-Metallicity Relations. Astrophysical Journal, 841(2), [84]. https://doi.org/10.3847/1538-4357/aa713d
Neeley, Jillian R. ; Marengo, Massimo ; Bono, Giuseppe ; Braga, Vittorio F. ; Dall'ora, Massimo ; Magurno, Davide ; Marconi, Marcella ; Trueba, Nicolas ; Tognelli, Emanuele ; Moroni, Pier G.Prada ; Beaton, Rachael L. ; Freedman, Wendy L. ; Madore, Barry F. ; Monson, Andrew ; Scowcroft, Victoria ; Seibert, Mark ; Stetson, Peter B. / On a New Theoretical Framework for RR Lyrae Stars. II. Mid-infrared Period-Luminosity-Metallicity Relations. In: Astrophysical Journal. 2017 ; Vol. 841, No. 2.
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abstract = "We present new theoretical period-luminosity-metallicity (PLZ) relations for RR Lyr{\ae} stars (RRLs) at Spitzer and WISE wavelengths. The PLZ relations were derived using nonlinear, time-dependent convective hydrodynamical models for a broad range of metal abundances (Z = 0.0001-0.0198). In deriving the light curves, we tested two sets of atmospheric models and found no significant difference between the resulting mean magnitudes. We also compare our theoretical relations to empirical relations derived from RRLs in both the field and in the globular cluster M4. Our theoretical PLZ relations were combined with multi-wavelength observations to simultaneously fit the distance modulus, μ 0, and extinction, A V, of both the individual Galactic RRL and of the cluster M4. The results for the Galactic RRL are consistent with trigonometric parallax measurements from Gaia's first data release. For M4, we find a distance modulus of μ 0 = 11.257 ± 0.035 mag with A V = 1.45 ± 0.12 mag, which is consistent with measurements from other distance indicators. This analysis has shown that, when considering a sample covering a range of iron abundances, the metallicity spread introduces a dispersion in the PL relation on the order of 0.13 mag. However, if this metallicity component is accounted for in a PLZ relation, the dispersion is reduced to ∼0.02 mag at mid-infrared wavelengths.",
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Neeley, JR, Marengo, M, Bono, G, Braga, VF, Dall'ora, M, Magurno, D, Marconi, M, Trueba, N, Tognelli, E, Moroni, PGP, Beaton, RL, Freedman, WL, Madore, BF, Monson, A, Scowcroft, V, Seibert, M & Stetson, PB 2017, 'On a New Theoretical Framework for RR Lyrae Stars. II. Mid-infrared Period-Luminosity-Metallicity Relations', Astrophysical Journal, vol. 841, no. 2, 84. https://doi.org/10.3847/1538-4357/aa713d

On a New Theoretical Framework for RR Lyrae Stars. II. Mid-infrared Period-Luminosity-Metallicity Relations. / Neeley, Jillian R.; Marengo, Massimo; Bono, Giuseppe; Braga, Vittorio F.; Dall'ora, Massimo; Magurno, Davide; Marconi, Marcella; Trueba, Nicolas; Tognelli, Emanuele; Moroni, Pier G.Prada; Beaton, Rachael L.; Freedman, Wendy L.; Madore, Barry F.; Monson, Andrew; Scowcroft, Victoria; Seibert, Mark; Stetson, Peter B.

In: Astrophysical Journal, Vol. 841, No. 2, 84, 01.06.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - On a New Theoretical Framework for RR Lyrae Stars. II. Mid-infrared Period-Luminosity-Metallicity Relations

AU - Neeley, Jillian R.

AU - Marengo, Massimo

AU - Bono, Giuseppe

AU - Braga, Vittorio F.

AU - Dall'ora, Massimo

AU - Magurno, Davide

AU - Marconi, Marcella

AU - Trueba, Nicolas

AU - Tognelli, Emanuele

AU - Moroni, Pier G.Prada

AU - Beaton, Rachael L.

AU - Freedman, Wendy L.

AU - Madore, Barry F.

AU - Monson, Andrew

AU - Scowcroft, Victoria

AU - Seibert, Mark

AU - Stetson, Peter B.

PY - 2017/6/1

Y1 - 2017/6/1

N2 - We present new theoretical period-luminosity-metallicity (PLZ) relations for RR Lyræ stars (RRLs) at Spitzer and WISE wavelengths. The PLZ relations were derived using nonlinear, time-dependent convective hydrodynamical models for a broad range of metal abundances (Z = 0.0001-0.0198). In deriving the light curves, we tested two sets of atmospheric models and found no significant difference between the resulting mean magnitudes. We also compare our theoretical relations to empirical relations derived from RRLs in both the field and in the globular cluster M4. Our theoretical PLZ relations were combined with multi-wavelength observations to simultaneously fit the distance modulus, μ 0, and extinction, A V, of both the individual Galactic RRL and of the cluster M4. The results for the Galactic RRL are consistent with trigonometric parallax measurements from Gaia's first data release. For M4, we find a distance modulus of μ 0 = 11.257 ± 0.035 mag with A V = 1.45 ± 0.12 mag, which is consistent with measurements from other distance indicators. This analysis has shown that, when considering a sample covering a range of iron abundances, the metallicity spread introduces a dispersion in the PL relation on the order of 0.13 mag. However, if this metallicity component is accounted for in a PLZ relation, the dispersion is reduced to ∼0.02 mag at mid-infrared wavelengths.

AB - We present new theoretical period-luminosity-metallicity (PLZ) relations for RR Lyræ stars (RRLs) at Spitzer and WISE wavelengths. The PLZ relations were derived using nonlinear, time-dependent convective hydrodynamical models for a broad range of metal abundances (Z = 0.0001-0.0198). In deriving the light curves, we tested two sets of atmospheric models and found no significant difference between the resulting mean magnitudes. We also compare our theoretical relations to empirical relations derived from RRLs in both the field and in the globular cluster M4. Our theoretical PLZ relations were combined with multi-wavelength observations to simultaneously fit the distance modulus, μ 0, and extinction, A V, of both the individual Galactic RRL and of the cluster M4. The results for the Galactic RRL are consistent with trigonometric parallax measurements from Gaia's first data release. For M4, we find a distance modulus of μ 0 = 11.257 ± 0.035 mag with A V = 1.45 ± 0.12 mag, which is consistent with measurements from other distance indicators. This analysis has shown that, when considering a sample covering a range of iron abundances, the metallicity spread introduces a dispersion in the PL relation on the order of 0.13 mag. However, if this metallicity component is accounted for in a PLZ relation, the dispersion is reduced to ∼0.02 mag at mid-infrared wavelengths.

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