Applying the Interferometric Baade-Wesselink method, hereafter IBW method, toVINCI/VLTI observations we determine the distance of seven Cepheids. For l Car, the more resolved star, we obtain an uncertainty on the derived distance of 5%. We also calibrate the zero-point of the Cepheid P-L relation with an uncertainty of 0.08 in magnitude....
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November 28, 2005 (v1)PublicationUploaded on: December 3, 2022
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April 24, 2017 (v1)Conference paper
International audience
Uploaded on: December 4, 2022 -
September 2019 (v1)Book
The principles of optical long baseline interferometry are presented firstly from the point of view of the coherence of the stellar wavefront and secondly from the point of view of the Object-Image relationship. These two complementary approaches permit to extract some important considerations for the actual implementation of this imaging...
Uploaded on: December 4, 2022 -
April 1, 2019 (v1)Book
Imaging at high angular resolution (HRA) is a flourishing discipline. High performance instruments like the spectro-polarimeter SPHERE at VLT/ESO has recently been implemented. A harvest of splendid results is continuously coming from interferometry with PIONIER, MATISSE, and now GRAVITY (all at VLTI/ESO), VEGA and JouFlu (CHARA), and at longer...
Uploaded on: December 4, 2022 -
November 13, 2013 (v1)Conference paper
Bright optical transients (i.e. transients typically visible with the naked eye) are populated mainly by novae eruptions plus a few supernovae (among which the SN1987a event). One bright nova happen every two years, either in the North ot in the South hemisphere. It occurs that current interferometers have matching sensitivities, with typically...
Uploaded on: March 25, 2023 -
October 13, 2019 (v1)Conference paper
Cepheids are the keystone of the extragalactic distance ladder because their pulsation periods correlate directly with their luminosity, through the Period-Luminosity (PL) relation (Leavitt & Pickering 1912). The discovery of the accelerated expansion of the Universe (Riess et al. 1998; 2011 Nobel prize) is largely based on the Cepheid PL...
Uploaded on: December 4, 2022 -
April 24, 2017 (v1)Conference paper
International audience
Uploaded on: December 4, 2022 -
November 18, 2021 (v1)Journal article
Context. As primary anchors of the distance scale, Cepheid stars play a crucial role in our understanding of the distance scale of the Universe because of their period-luminosity relation. Determining precise and consistent parameters (radius, temperature, color excess, and projection factor) of Cepheid pulsating stars is therefore very...
Uploaded on: December 4, 2022 -
2019 (v1)Journal article
Context. The multiplicity of classical Cepheids (CCs) and RR Lyrae stars (RRLs) is still imperfectly known, particularly for RRLs. Aims. In order to complement the close-in short orbital period systems presented in Paper I, our aim is to detect the wide, spatially resolved companions of the targets of our reference samples of Galactic CCs and...
Uploaded on: December 4, 2022 -
April 2004 (v1)Journal article
Recent interferometric observations of the brightest and angularly largest classical Cepheid, l Carinae, with ESO's Very Large Telescope Interferometer have resolved with high precision the variation of its angular diameter with phase. We compare the measured angular diameter curve to the one that we derive by an application of the...
Uploaded on: December 4, 2022 -
March 1, 2017 (v1)Journal article
International audience
Uploaded on: December 4, 2022 -
2021 (v1)Journal article
The current tension between the direct and the early-universe measurements of the Hubble constant, H 0, requires detailed scrutiny of all the data and methods used in the studies on both sides of the debate. The Cepheids in the Type Ia supernova (SN Ia) host galaxy NGC 5584 played a key role in the local measurement of H 0. The SH0ES project...
Uploaded on: December 4, 2022 -
2017 (v1)Journal article
International audience
Uploaded on: December 3, 2022 -
March 2019 (v1)Journal article
Context. Classical Cepheids (CCs) and RR Lyrae stars (RRLs) are important classes of variable stars used as standard candles to estimate galactic and extragalactic distances. Their multiplicity is imperfectly known, particularly for RRLs. Astoundingly, to date only one RRL has convincingly been demonstrated to be a binary, TU UMa, out of tens...
Uploaded on: February 23, 2023 -
March 2019 (v1)Journal article
Context. Classical Cepheids (CCs) and RR Lyrae stars (RRLs) are important classes of variable stars used as standard candles to estimate galactic and extragalactic distances. Their multiplicity is imperfectly known, particularly for RRLs. Astoundingly, to date only one RRL has convincingly been demonstrated to be a binary, TU UMa, out of tens...
Uploaded on: December 4, 2022 -
2018 (v1)Journal article
In this paper we present the most promising science cases for a new generation visible instrument on the VLTI and the conceptual idea for the instrumental configuration. We also present a statistical study of the potential targets that may be accessible for the different classes of objects and for the required spectral resolutions.
Uploaded on: December 4, 2022 -
2017 (v1)Journal article
The projection factor (p-factor) is an essential component of the classical Baade-Wesselink (BW) technique, which is commonly used to determine the distances to pulsating stars. It is a multiplicative parameter used to convert radial velocities into pulsational velocities. As the BW distances are linearly proportional to the p-factor, its...
Uploaded on: February 28, 2023 -
June 22, 2023 (v1)Journal article
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Uploaded on: November 30, 2023