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

  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},
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… 

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