Classical Cepheid Pulsation Models. XI. Effects of convection and chemical composition on the Period-Luminosity and Period-Wesenheit relations

Abstract

In spite of the relevance of Classical Cepheids as primary distance indicators, a general consensus on the dependence of the Period-Luminosity (PL) relation on the Cepheid chemical composition has not been achieved yet. From the theoretical point of view, our previous investigations were able to reproduce some empirical tests for suitable assumptions on the helium to metal relative enrichment, but those results relied on specific assumptions concerning the Mass-Luminosity relation and the efficiency of the convective transfer in the pulsating envelopes. In this paper, we investigate the effects of the assumed value of the mixing length parameter l/Hp on the pulsation properties and we release the assumption of a fixed Mass-Luminosity relation. As a whole, we show that our pulsation relations appear fully consistent with the observed properties of Galactic and Magellanic Cloud Cepheids, supporting the predicted steepening and brightening of the PL relations when moving from metal-rich to metal-poor variables. Moreover, we show that the distances inferred by the predicted PW relations agree with recently measured trigonometric parallaxes, whereas they suggest a correction to the values based on the Infrared Surface Brightness technique, as already found from an independent method. Finally, also the pulsation metal contents suggested by the predicted PW relations appear in statistical agreement with spectroscopic [Fe/H] measurements.

arXiv comment20 pages, 15 figures

References in corpus (37)

• Evolutionary tracks and isochrones for low- and intermediate-mass stars: from 0.15 to 7 M_sun, and from Z=0.0004 to 0.03
• A large stellar evolution database for population synthesis studies. I. Scaled solar models and isochrones
• SINGS: The SIRTF Nearby Galaxies Survey
• Color Transformations for the 2MASS Second Incremental Data Release
• The HST Key Project on the Extragalactic Distance Scale XIII. The Metallicity Dependence of the Cepheid Distance Scale
• A new Cepheid distance to the maser-host galaxy NGC 4258 and its implications for the Hubble Constant
• New Period-Luminosity and Period-Color Relations of Classical Cepheids: I. Cepheids in the Galaxy
• The Effect of Metallicity on Cepheid-Based Distances
• Using Cepheids to determine the galactic abundance gradient I. The solar neighbourhood
• Intermediate-mass star models with different helium and metal contents
• Using Cepheids to determine the galactic abundance gradient II. Towards the galactic center
• New Period-Luminosity and Period-Color Relations of Classical Cepheids: II. Cepheids in LMC
• The effect of metallicity on the Cepheid Period-Luminosity relation from a Baade-Wesselink analysis of Cepheids in the Galaxy and in the Small Magellanic Cloud
• Theoretical Models for Classical Cepheids: II. Period-Luminosity, Period-Color and Period-Luminosity-Color Relations
• Using Cepheids to determine the galactic abundance gradient. III.First results for the outer disc
• Classical Cepheid Pulsation Models. III. The Predictable Scenario
• Direct Distances to Cepheids in the Large Magellanic Cloud: Evidence for a Universal Slope of the Period-Luminosity Relation up to Solar Abundance
• The MACHO Project LMC Variable Star Inventory: I. Beat Cepheids - Conclusive Evidence for the Excitation of the Second Overtone in Classical Cepheids
• Cepheid pulsation models at varying metallicity and DY/DZ
• RR Lyrae stars in Galactic globular clusters.III. Pulsational predictions for metal content Z=0.0001 to Z=0.006
• Theoretical models for classical Cepheids. VIII. Effects of helium and heavy elements abundance on the Cepheid distance scale
• RR Lyrae stars in Galactic globular clusters. II. A theoretical approach to variables in M3
• Further empirical evidence for the non-linearity of the period-luminosity relations as seen in the Large Magellanic Cloud Cepheids
• Improving the mass determination of Galactic Cepheids
• The extra-galactic Cepheid distance scale from LMC and Galactic period-luminosity relations
• The Linearity of the Wesenheit function for the Large Magellanic Cloud Cepheids
• Stellar Evolutionary Models for Magellanic Clouds
• The RR Lyrae U Com as a test for nonlinear pulsation models
• The metallicity dependence of the Cepheid PL-relation
• A "pulsational" distance determination for the Large Magellanic Cloud
• Period - magnitude relationships in BVIJHK-Bands for fundamental mode and first overtone Cepheids
• GAIA and the Extragalactic Distance Scale
• Discovery of an edge-on dust disk around the [WC10] central star CPD-568032
• Period-luminosity relations for Galactic Cepheid variables with independent distance measurements
• Nonlinear Period-Luminosity Relation for the Large Magellanic Cloud Cepheids: Myths and Truths
• The Faint Cepheids of the Small Magellanic Cloud: an evolutionary selection effect?
• Blue irregular variable stars in the Small Magellanic Cloud from EROS2 : Herbig Ae/Be or classical Be stars ?

Cited by in corpus (52)

• On a new theoretical framework for RR Lyrae stars I: the metallicity dependence
• The updated BaSTI stellar evolution models and isochrones: II. alpha-enhanced calculations
• Insights into the Cepheid distance scale
• A re-classification of Cepheids in the Gaia Data Release 2
• Quantitative Spectroscopy of Blue Supergiant Stars in the Disk of M81: Metallicity, Metallicity Gradient and Distance
• Old-Aged Stellar Population Distance Indicators
• Galactic abundance gradients from Cepheids: alpha and heavy elements in the outer disk
• Cepheids in external galaxies. I. The maser-host galaxy NGC 4258 and the metallicity dependence of P-L and P-W relations
• The Cepheid mass discrepancy and pulsation-driven mass loss
• Cepheid theoretical models and observations in HST/WFC3 filters: the effect on the Hubble constant Ho
• Galactic Cepheids with Spitzer: I. Leavitt Law and Colors
• The ACS LCID Project. II. Faint Variable Stars in the Isolated Dwarf Irregular Galaxy IC1613
• Uncertainties on the theoretical predictions for classical Cepheid pulsational quantities
• New NIR light-curve templates for classical Cepheids
• Revisiting the abundance gradient in the maser host galaxy NGC 4258
• A Classical Cepheid in a LMC eclipsing binary: evidence of shortcomings in current stellar evolutionary models?
• Pulsation Models for Ultra-Low (Z=0.0004) Metallicity Classical Cepheids
• The Period-Luminosity Relation for the Large Magellanic Cloud Cepheids Derived from Spitzer Archival Data
• A Global Physical Model for Cepheids
• An updated metal-dependent theoretical scenario for Classical Cepheids
• On the Application of Wesenheit Function in Deriving Distance to Galactic Cepheids
• High-precision distance measurements with classical pulsating stars
• Cepheid Metallicity in the Leavitt Law (C-MetaLL) survey: I. HARPS-N@TNG spectroscopy of 47 Classical Cepheid and 1 BL Her variables
• A Comparative Study of Multiwavelength Theoretical and Observed Light Curves of Cepheid Variables
• Theoretical fits of the δCephei light, radius and radial velocity curves
• An extended theoretical scenario for Classical Cepheids. I. Modeling Galactic Cepheids in the Gaia photometric system
• Theoretical fit of Cepheid light an radial velocity curves in the Large Magellanic Cloud cluster NGC 1866
• Detailed chemical composition of classical Cepheids in the LMC cluster NGC 1866 and in the field of the SMC
• The ancient stellar population of M32: RR Lyr Variable stars confirmed
• Properties of M31. II: A Cepheid disk sample derived from the first year of PS1 PAndromeda data
• On the Period--Luminosity--Metallicity relation of Classical Cepheids
• On a new and homogeneous metallicity scale for Galactic classical Cepheids - I. Physical parameters
• Ultra Long Period Cepheids: a primary standard candle out to the Hubble flow
• Panchromatic Hubble Andromeda Treasury XIII: The Cepheid period-luminosity relation in M31
• Blue straggler masses from pulsation properties. II. Topology of the Instability Strip
• Updated theoretical Period-Age and Period-Age-Color relations for Galactic Classical Cepheids: an application to the Gaia DR2 sample
• On the variation of light curve parameters of RR Lyrae variables at multiple wavelengths
• The stellar photosphere-hydrogen ionization front interaction in Classical Pulsators: a theoretical explanation for observed period-colour relations
• The Cepheids of NGC1866: A Precise Benchmark for the Extragalactic Distance Scale and Stellar Evolution from Modern UBVI Photometry
• Empirical instability strip for classical Cepheids: I. The LMC galaxy
• Theoretical Cepheid Period-Luminosity And Period-Color Relations In Spitzer IRAC Bands
• HD344787: a true Polaris analogue?
• Young and Intermediate-age Distance Indicators
• Synthetic population of binary Cepheids. I. The effect of metallicity and initial parameter distribution on characteristics of Cepheids' companions
• The Milky Way as Seen by Classical Cepheids I: Distances Based on Mid-infrared Photometry
• New insights into the use of Ultra Long Period Cepheids as cosmological standard candles
• Distances to Galaxies from the Brightest Stars in the Universe
• A theoretical framework for BL Her stars III. A case study: Robust light curve optimisation in the LMC
• On the impact of Helium abundance on the Cepheid Period-Luminosity and Wesenheit relations and the Distance Ladder
• On the Cepheid Metallicity Dichotomy
• Multiwavelength Light Curve Parameters of Cepheid Variables
• AGILE: an end-to-end Rubin-LSST simulation of AGNs, galaxies, and stars I. Software description and first data release