Baade-Wesselink distances and the effect of metallicity in classical cepheids

  title={Baade-Wesselink distances and the effect of metallicity in classical cepheids},
  author={Martin A. T. Groenewegen},
  journal={Astronomy and Astrophysics},
Context. The metallicity dependence of the Cepheid PL-relation is of importance in establishing the extra-galactic distance scale. Aims. The aim of this paper is to investigate the metallicity dependence of the PL-relation in V and K based on a sample of 68 Galactic Cepheids with individual Baade-Wesselink distances (some of the stars also have an HST-based parallax) and individually determined metallicities from high-resolution spectroscopy. Methods. Literature values of the V-band, K-band and… 

Figures and Tables from this paper

Baade-Wesselink distances to Galactic and Magellanic Cloud Cepheids and the effect of metallicity
Context. The metallicity dependence of the Cepheid period–luminosity (PL) relation is of importance in establishing the extragalactic distance scale. Aims. The aim of this paper is to investigate the
New Baade-Wesselink distances and radii for four metal-rich Galactic Cepheids ?
Aims. We provide accurate estimates of distances, radii, and iron abundances of four metal-rich Cepheids, namely V340 Ara, UZ Sct, AV Sgr, and VY Sgr. The main aim of this investigation is to
In this paper, we explore the possibility of using the Wesenheit function to derive individual distances to Galactic Cepheids, as the dispersion of the reddening-free Wesenheit function is smaller
Observational studies of Cepheid amplitudes. I. Period-amplitude relationships for Galactic Cepheids
Context. The dependence of amplitude on the pulsation period differs from other Cepheid-related relationships. Aims. We attempt to revise the period-amplitude (P-A) relationship of Galactic Cepheids
Insights into the Cepheid Distance Scale
We present a detailed investigation of the Cepheid distance scale by using both theory and observations. Through the use of pulsation models for fundamental mode Cepheids, we found that the slope of
Tuning in on Cepheids: Radial velocity amplitude modulations - A source of systematic uncertainty for Baade-Wesselink distances
Context. Classical Cepheids are crucial calibrators of the extragalactic distance scale. The Baade-Wesselink technique can be used to calibrate Cepheid distances using Cepheids in the Galaxy and the
On the binarity of the classical Cepheid X Sagittarii from interferometric observations
Optical-infrared interferometry can provide direct geometrical measurements of the radii of Cepheids and/or reveal unknown binary companions of these stars. Such information is of great importance
Calibrating the Cepheid Period-Luminosity relation from the infrared surface brightness technique II. The effect of metallicity, and the distance to the LMC
Context. The extragalactic distance scale builds directly on the Cepheid period-luminosity (PL) relation as delineated by the sample of Cepheids in the Large Magellanic Cloud (LMC). However, the LMC
A new and homogeneous metallicity scale for Galactic classical Cepheids
We gathered more than 1130 high-resolution optical spectra for more than 250 Galactic classical Cepheids. The spectra were collected with the optical spectrographs UVES at VLT, HARPS at 3.6 m, FEROS
Calibrating The Cepheid Period-Luminosity Relation From The Infrared Surface Brightness Technique I. The P-Factor, The Milky Way Relations, And A Universal K-Band Relation
Aims. We determine period-luminosity relations for Milky Way Cepheids in the optical and near-IR bands. These relations can be used directly as reference for extra-galactic distance determination to


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
We have applied the near-IR Barnes-Evans realization of the Baade-Wesselink method as calibrated by Fouque& Gieren (1997) to five metal-poor Cepheids with periods between 13 and 17 days in the Small
The metallicity dependence of the Cepheid PL-relation
A sample of 37 Galactic, 10 LMC and 6 SMC cepheids is compiled for which individual metallicity estimates exist and BVIK  photometry in almost all cases. The Galactic cepheids all have an individual
A New Calibration Of Galactic Cepheid Period-Luminosity Relations From B To K Bands, And A Comparison To LMC Relations
Context. The universality of the Cepheid Period-Luminosity relations has been under discussion since metallicity effects have been assumed to play a role in the value of the intercept and, more
Cepheid Period-Radius and Period-Luminosity Relations and the Distance to the Large Magellanic Cloud
We have used the infrared Barnes-Evans surface brightness technique to derive the radii and distances of 34 Galactic Cepheid variables. Radius and distance results obtained from both versions of the
Calibration of the Distance Scale from Cepheids
We apply the infrared surface brightness method of Fouque and Gieren to a sample of 32 Galactic Cepheids with excellent photometric and radial velocity data. The distance solutions are fully
Rebuilding the Cepheid Distance Scale. I. A Global Analysis of Cepheid Mean Magnitudes
We develop a statistical method for using multicolor photometry to determine distances using Cepheid variables, including the effects of temperature, extinction, and metallicity, and apply it to
Self consistent modelling of the projection factor for interferometric distance determination
The distance of galactic Cepheids can be derived through the interferometric Baade-Wesselink method. The interfer- ometric measurements lead to angular diameter estimations over the whole pulsation
Direct Distances to Cepheids in the Large Magellanic Cloud: Evidence for a Universal Slope of the Period-Luminosity Relation up to Solar Abundance
We have applied the infrared surface brightness (ISB) technique to derive distances to 13 Cepheid variables in the LMC that span a period range from 3 to 42 days. From the absolute magnitudes of the
High resolution spectroscopy for Cepheids distance determination
Context. In the recent years, infrared interferometry revealed the presence of faint dusty circumstellar envelopes (CSE) around Cepheids. However the size, shape, chemical nature, and the interaction
The projection factor of δ Cephei A calibration of the Baade-Wesselink method using the CHARA Array
Cepheids play a key role in astronomy as standard candles for measuring intergalactic distances. Their distance is usually inferred from the period-luminosity relationship, calibrated using the