An Improved Calibration of the Wavelength Dependence of Metallicity on the Cepheid Leavitt law

Abstract

The Cepheid period-luminosity (PL) relation (or Leavitt law) has served as the first rung of the most widely used extragalactic distance ladder and is central to the determination of the local value of the Hubble constant ($H_0$). We investigate the influence of metallicity on Cepheid brightness, a term that significantly improves the overall fit of the distance ladder, to better define its wavelength dependence. To this aim, we compare the PL relations obtained for three Cepheid samples having distinct chemical composition (in the Milky Way and Magellanic Clouds) and focusing on the use of improved and recent data while covering a metallicity range of about 1 dex. We estimate the metallicity effect (hereafter $\gamma$) in 15 filters from mid-IR to optical wavelengths, including five Wesenheit indices, and we derive a significant metallicity term in all filters, in agreement with recent empirical studies and models, in the sense of metal-rich Cepheids being brighter than metal-poor ones. We describe the contribution of various systematic effects in the determination of the $\gamma$ term. We find no evidence of $\gamma$ changing over the wavelength range $0.5-4.5\mu \mathrm{m}$, indicating that the main influence of metallicity on Cepheids is in their luminosity rather than color. Finally, we identify factors that sharpen the empirical constraints on the metallicity term over past studies, including corrections for the depth of the Magellanic Clouds, better-calibrated Cepheid photometry, improved Milky Way extinction estimates, and revised and expanded metallicity measurements in the LMC.

Accepted to ApJ

References in corpus (35)

• The Gaia mission
• A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km/s/Mpc Uncertainty from the Hubble Space Telescope and the SH0ES Team
• In the Realm of the Hubble tension $-$ a Review of Solutions
• Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics Beyond LambdaCDM
• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• Gaia Early Data Release 3: Parallax bias versus magnitude, colour, and position
• Cosmic Distances Calibrated to 1% Precision with Gaia EDR3 Parallaxes and Hubble Space Telescope Photometry of 75 Milky Way Cepheids Confirm Tension with LambdaCDM
• An eclipsing binary distance to the Large Magellanic Cloud accurate to 2 per cent
• A distance to the Large Magellanic Cloud that is precise to one per cent
• An Analysis of the Shapes of Interstellar Extinction Curves. VII. Milky Way Spectrophotometric Optical-through-Ultraviolet Extinction and Its R-Dependence
• A new Cepheid distance to the maser-host galaxy NGC 4258 and its implications for the Hubble Constant
• The Origin of the Magellanic Stream and Its Leading Arm
• The influence of chemical composition on the properties of Cepheid stars. II-The iron content
• A distance determination to the Small Magellanic Cloud with an accuracy of better than 2 percent based on late-type eclipsing binary stars
• On the fine structure of the Cepheid metallicity gradient in the Galactic thin disk
• The VISTA ZYJHKs Photometric System: Calibration from 2MASS
• OGLE-ing the Magellanic System: Optical Reddening Maps of the Large and Small Magellanic Cloud from Red Clump Stars
• The VMC Survey. XXV. The 3D structure of the Small Magellanic Cloud from Classical Cepheids
• Cepheids in external galaxies. I. The maser-host galaxy NGC 4258 and the metallicity dependence of P-L and P-W relations
• New period-luminosity and period-color relations of classical Cepheids: III. Cepheids in SMC
• The panchromatic view of the Magellanic Clouds from Classical Cepheids. I. Distance, Reddening and Geometry of the Large Magellanic Cloud disk
• Reddenings of FGK supergiants and classical Cepheids from spectroscopic data
• Empirical calibration of the reddening maps in the Magellanic Clouds
• The influence of metallicity on the Leavitt Law from geometrical distances of Milky Way and Magellanic Clouds Cepheids
• Classical Cepheid period-Wesenheit-metallicity relation in the Gaia bands
• An updated metal-dependent theoretical scenario for Classical Cepheids
• Cepheid Metallicity in the Leavitt Law (C-MetaLL) survey: I. HARPS-N@TNG spectroscopy of 47 Classical Cepheid and 1 BL Her variables
• The VMC Survey -- XLVIII. Classical Cepheids unveil the 3D geometry of the LMC
• Disk of the Small Magellanic Cloud as traced by Cepheids
• New homogeneous iron abundances of double-mode Cepheids from high-resolution echelle spectroscopy
• Inspecting the Cepheid parallax of pulsation using Gaia EDR3 parallaxes. Projection factor and period-luminosity and period-radius relations
• On the Period--Luminosity--Metallicity relation of Classical Cepheids
• A new and homogeneous metallicity scale for Galactic classical Cepheids II. The abundance of iron and alpha elements
• Current Challenges in Cepheid Distance Calibrations Using Gaia EDR3
• Analysing the spectral energy distributions of Galactic classical Cepheids

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• No rungs attached: A distance-ladder free determination of the Hubble constant through type II supernova spectral modelling
• A twisted and precessing Cepheid warp in the outer Milky Way disc
• Cepheid metallicity in the Leavitt law (C-MetaLL) survey -- III. Simultaneous derivation of the Gaia parallax offset and Period-Luminosity-Metallicity coefficients
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• Reeling in the Whirlpool: the distance to M 51 clarified by Cepheids and the Type IIP SN 2005cs
• Metallicity estimation of MW, SMC and LMC classical Cepheids from the shape of the $V$- and $I$-band light curves
• Period-Luminosity Relations for Galactic classical Cepheids in the Sloan bands
• Cepheids with giant companions. II. Spectroscopic confirmation of nine new double-lined binary systems composed of two Cepheids
• Search for Classical Cepheids in Galactic Open Clusters and Calibration of the Period Wesenheit Metallicity Relation in the Gaia Bands
• The Milky Way as Seen by Classical Cepheids I: Distances Based on Mid-infrared Photometry
• Spectral energy distributions of classical cepheids in the Magellanic Clouds
• Calibrating and standardizing the Tip of the Red Giant Branch in the Small Magellanic Cloud using small-amplitude red giants
• Synthetic Population of Binary Cepheids. II. The effect of companion light on the extragalactic distance scale
• The stellar evolution perspective on the metallicity dependence of classical Cepheid Leavitt laws
• The Legacy of Henrietta Leavitt: A Re-analysis of the First Cepheid Period-Luminosity Relation
• A theoretical framework for BL Her stars IV. New period-luminosity relations in the Rubin-LSST filters
• Toward a Comprehensive Grid of Cepheid Models with MESA. III. Evolutionary and Pulsation Relations for Models with Core and Envelope Overshooting
• Cepheid Metallicity in the Leavitt Law (C-MetaLL) survey: IX. Metallicity dependence of Period-Wesenheit relations based on a homogeneous spectroscopic sample
• Empirical instability strip for classical Cepheids II. The Small Magellanic Cloud galaxy
• Forward-modelling Milky Way Cepheids: selection effects and physical priors in the Gaia-HST calibration
• Systematic and Statistical Uncertainties in Cepheid PL Relations: Incorporating a Cross-Filter Random-Phase Mitigation Approach