The flux-weighted gravity-luminosity relation of Galactic classical Cepheids

Abstract

The flux-weighted gravity-luminosity relation (FWGLR) is investigated for a sample of 477 classical Cepheids (CCs), including stars that have been classified in the literature as such but are probably not. The luminosities are taken from the literature, based on the fitting of the spectral energy distributions (SEDs) assuming a certain distance and reddening. The flux-weighted gravity (FWG) is taken from gravity and effective temperature determinations in the literature based on high-resolution spectroscopy. There is a very good agreement between the theoretically predicted and observed FWG versus pulsation period relation that could serve in estimating the FWG (and $\log g$) in spectroscopic studies with a precision of 0.1~dex. As was known in the literature, the theoretically predicted FWGLR relation for CCs is very tight and is not very sensitive to metallicity (at least for LMC and solar values), rotation rate, and crossing of the instability strip. The observed relation has a slightly different slope and shows more scatter (0.54~dex). This is due both to uncertainties in the distances and to the pulsation phase averaged FWG values. Data from future Gaia data releases should reduce these errors, and then the FWGLR could serve as a powerful tool in Cepheid studies.

arXiv commentA&A in press

References in corpus (28)

• Gaia Data Release 2. Summary of the contents and survey properties
• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics Beyond LambdaCDM
• A distance to the Large Magellanic Cloud that is precise to one per cent
• Milky Way Cepheid Standards for Measuring Cosmic Distances and Application to Gaia DR2: Implications for the Hubble Constant
• Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18
• The influence of chemical composition on the properties of Cepheid stars. II-The iron content
• On the fine structure of the Cepheid metallicity gradient in the Galactic thin disk
• On the Effect of Rotation on Populations of Classical Cepheids II. Pulsation Analysis for Metallicities 0.014, 0.006, and 0.002
• Using Cepheids to determine the galactic abundance gradient I. The solar neighbourhood
• Quantitative Spectroscopy of 24 A supergiants in the Sculptor galaxy NGC 300: Flux weighted gravity luminosity relationship, metallicity and metallicity gradient
• The Gaia astrophysical parameters inference system (Apsis). Pre-launch description
• Using Cepheids to determine the galactic abundance gradient. III.First results for the outer disc
• A new extragalactic distance determination method using the flux-weighted gravity of late B and early A supergiants
• Elemental Abundance Ratios in Stars of the Outer Galactic Disk. III. Cepheids
• Cepheid Abundances: Multiphase Results and Spatial Gradients
• Galactic abundance gradients from Cepheids : On the iron abundance gradient around 10-12 kpc
• Stellar parametrization from Gaia RVS spectra
• The Cepheid period -- luminosity -- metallicity relation based on Gaia DR2 data
• A spectroscopic study of blue supergiant stars in the Sculptor galaxy NGC 55: chemical evolution and distance
• Oxygen, α-element and iron abundance distributions in the inner part of the Galactic thin disc
• Barium Abundances in Cepheids
• C, N, O, and Na Abundances of Cepheid Variables: Implications on the Mixing Process in the Envelope
• Oxygen, $\alpha$-element and iron abundance distributions in the inner part of the Galactic thin disc. II
• First metallicity determination from Near-Infrared spectra for five obscured Cepheids discovered in the inner Disk
• Analysing the spectral energy distributions of Galactic classical Cepheids
• A Simple Unified Spectroscopic Indicator of Stellar Luminosity: the Extended Flux Weighted Gravity-Luminosity Relationship
• Towards precise and accurate Cepheid chemical abundances for 1$\%$ $\mbox{H}_0$ measurement: temperature determination

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• A new and homogeneous metallicity scale for Galactic classical Cepheids II. The abundance of iron and alpha elements
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