Time, spatial, and spectral resolution of the Hα line-formation region of Deneb and Rigel with the VEGA/CHARA interferometer

@article{Chesneau2010TimeSA,
  title={Time, spatial, and spectral resolution of the Hα line-formation region of Deneb and Rigel with the VEGA/CHARA interferometer},
  author={O. Chesneau and L. Dessart and D. Mourard and P. B{\'e}rio and C. Buil and D. Bonneau and M. Fernandes and J. Clausse and O. Delaa and A. Marcotto and A. Meilland and F. Millour and N. Nardetto and K. Perraut and A. Roussel and A. Spang and P. Stee and I. Tallon-Bosc and H. Mcalister and T. Brummelaar and J. Sturmann and L. Sturmann and N. Turner and C. Farrington and P. J. Goldfinger},
  journal={Astronomy and Astrophysics},
  year={2010},
  volume={521}
}
BA-type supergiants are amongst the most optically-bright stars. They are observable in extragalactic environments, hence potential accurate distance indicators. Emission activity in the Halpha line of the BA supergiants Rigel (B8Ia) and Deneb (A2Ia) is indicative of presence of localized time-dependent mass ejections. Here, we employ optical interferometry to study the Halpha line-formation region in these stellar environments. High spatial- (0.001 arcsec) and spectral- (R=30 000) resolution… Expand
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