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Photometric and spectroscopic variability of the B5IIIe star HD 171219
L. Andrade, E. Janot-Pacheco, M. Emilio +11
We analyzed the star HD 171219, one of the relatively bright Be stars observed in the seismo field of the CoRoT satellite, in order to determine its physical and pulsation characte…
Measuring surface magnetic fields of red supergiant stars
Benjamin Tessore, Agnès Lèbre, Julien Morin +3
RSG stars are very massive cool evolved stars. Recently, a weak magnetic field was measured at the surface of Ori and this is so far the only M-type supergiant for which a dire…
Detection of the linearly polarised spectrum of the red supergiant star alpha Ori
Benjamin Tessore, Arturo Lòpez-Ariste, Philippe Mathias +3
In the solar limb, linear polarisation is due to anisotropy of the radiation field induced by limb darkening. It is maximal when it is seen parallel to the limb and it vanishes whe…
HARPS-N high spectral resolution observations of Cepheids I. The Baade-Wesselink projection factor of δ Cep revisited
N. Nardetto, E. Poretti, M. Rainer +13
The projection factor p is the key quantity used in the Baade-Wesselink (BW) method for distance determination; it converts radial velocities into pulsation velocities. Several met…