The yellow hypergiant HR 5171 A: Resolving a massive interacting binary in the common envelope phase

  title={The yellow hypergiant HR 5171 A: Resolving a massive interacting binary in the common envelope phase},
  author={Olivier Chesneau and Anthony Meilland and Edouard Chapellier and F. Millour and Arnout M. van Genderen and Yael Naz'e and Nathan Smith and Alain Spang and Jonathan V. Smoker and Luc Dessart and Samer Kanaan and Philippe P. Bendjoya and M. Feast and Jose H Groh and Alex Lobel and Nicolas Nardetto and Sebasti{\'a}n A. Otero and Rene Dick Oudmaijer and Abiy G. Tekola and Patricia A. Whitelock and C Arcos and Michel Cur'e and Leonardo Vanzi},
  journal={Astronomy and Astrophysics},
We initiated long-term optical interferometry monitoring of the diameters of unstable yellow hypergiants (YHG) with the goal of detecting both the long-term evolution of their radius and shorter term formation related to large mass-loss events. We observed HR5171 A with AMBER/VLTI. We also examined archival photometric data in the visual and near-IR spanning more than 60 years, as well as sparse spectroscopic data. HR5171A exhibits a complex appearance. Our AMBER data reveal a surprisingly… 
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