# Intensity interferometry of P Cygni in the H α emission line: towards distance calibration of LBV supergiant stars

@article{Rivet2020IntensityIO,
title={Intensity interferometry of P Cygni in the H $\alpha$ emission line: towards distance calibration of LBV supergiant stars},
author={Jean-Pierre Rivet and A Siciak and E S G de Almeida and Farrokh Vakili and A Domiciano de Souza and Mathilde Fouch'e and Olivier Lai and David Vernet and Robin Kaiser and William Guerin},
journal={Monthly Notices of the Royal Astronomical Society},
year={2020}
}
• Published 18 October 2019
• Physics
• Monthly Notices of the Royal Astronomical Society
We present intensity interferometry of the luminous blue variable P Cyg in the light of its H α emission performed with 1 m-class telescopes. We compare the measured visibility points to synthesized interferometric data based on the CMFGEN physical modelling of a high-resolution spectrum of P Cyg recorded almost simultaneously with our interferometry data. Tuning the stellar parameters of P Cyg and its H α linear diameter, we estimate the distance of P Cyg as 1.56 ± 0.25 kpc, which is…
13 Citations

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## References

SHOWING 1-10 OF 116 REFERENCES
The H-band Emitting Region of the Luminous Blue Variable P Cygni: Spectrophotometry and Interferometry of the Wind
• Physics
• 2013
We present the first high angular resolution observations in the near-infrared H band (1.6 μm) of the luminous blue variable star P Cygni. We obtained six-telescope interferometric observations with
A SPECTROSCOPIC INVESTIGATION OF P CYGNI. I. H AND HE I LINES
• Physics
• 1997
We present a detailed spectroscopic analysis of the H and He i spectrum of the Luminous Blue Variable (LBV) P Cygni. The observational constraints for our investigation are given by the mean optical
THE Hα VARIATIONS OF THE LUMINOUS BLUE VARIABLE P CYGNI: DISCRETE ABSORPTION COMPONENTS AND THE SHORT S DORADUS-PHASE
• Physics
• 2011
P Cygni is a prototype of the luminous blue variables (or S Doradus variables), and the star displays photometric and emission line variability on a timescale of years (known as the 'short S
THE SPATIALLY RESOLVED H{alpha}-EMITTING WIND STRUCTURE OF P CYGNI
• Physics, Environmental Science
• 2010
High spatial resolution observations of the Hα-emitting wind structure associated with the luminous blue variable star P Cygni were obtained with the Navy Prototype Optical Interferometer. These
Near-Infrared interferometry of Eta Carinae with high spatial and spectral resolution using the VLTI and the AMBER instrument
• Physics
• 2006
We present the first NIR spectro-interferometry of the LBV Eta Carinae. The K band observations were performed with the AMBER instrument of the ESO Very Large Telescope Interferometer using three
X-Ray Emission from Massive Stars in Cyg OB2
• Physics
• 2015
We report on the analysis of the Chandra-ACIS data of O, B and WR stars in the young association Cyg OB2. X-ray spectra of 49 O-stars, 54 B-stars and 3 WR-stars are analyzed and for the brighter
Quantitative Spectroscopy of Luminous Blue Stars in Distant Galaxies
• Physics
• 1995
Hydrodynamic non-LTE model atmospheres, applied to the interpretation of the spectral signatures of strong stellar winds from blue stars, provide the key for the determination of their intrinsic
Near-infrared interferometry of eta Carinae with spectral resolutions of 1 500 and 12 000 using AMBER/VLTI
• Physics
• 2007
Aims. We present the first NIR spectro-interferometry of the LBV ? Carinae. The observations were performed with the AMBER instrument of the ESO Very Large Telescope Interferometer (VLTI) using
On the influence of the companion star in Eta Carinae: 2D radiative transfer modeling of the ultraviolet and optical spectra
We present 2D radiative transfer modeling of the Eta Carinae binary system accounting for the presence of a wind-wind collision (WWC) cavity carved in the optically-thick wind of the primary star. By
Probing the weak wind phenomenon in Galactic O-type giants
• Physics
Astronomy & Astrophysics
• 2019
Aims. Analyses of Galactic late O dwarfs (O8-O9.5V stars) raised the “weak wind problem”: spectroscopic mass-loss rates (Ṁ) are up to two orders of magnitude lower than the theoretical values. We