VLTI/AMBER spectro-interferometric imaging of VX Sgr's inhomogenous outer atmosphere (2009)
Chiavassa, A., Lacour, S., Millour, F., Driebe, T., Wittkowski, M., Plez, B., ...
Aims. We aim to explore the photosphere of the very cool late-type star VX Sgr and in particular the existence and characterization of molecular layers above the continuum forming photosphere....
Chiavassa, A., Plez, B., Josselin, E., Freytag, B.
Context. It has been suggested that convection in Red Supergiant (RSG) stars gives rise to large-scale granules causing observable surface inhomogeneities. This convection is also extremely vigorous,...
Asteroseismology and interferometry of the red giant star epsilon Oph (2009)
Mazumdar, A., Merand, A., Demarque, P., Kervella, P., Barban, C., Baudin, F., ...
The GIII red giant star epsilon Oph has been found to exhibit several modes of oscillation by the MOST mission. We interpret the observed frequencies of oscillation in terms of theoretical radial...
New high resolution synthetic stellar libraries for the Gaia Mission (2008)
Sordo, R., Vallenari, A., Bouret, J. C., Brott, I., Edvardsson, B., Fremat, Y., ...
High resolution synthetic stellar libraries are of fundamental importance for the preparation of the Gaia Mission. We present new sets of spectral stellar libraries covering two spectral ranges: 300...
Atmospheric dynamics of red supergiant stars and applications to Interferometry (2008)
Chiavassa, A., Plez, B., Josselin, E., Freytag, B.
We have written a 3D radiative transfer code that computes emerging spectra and intensity maps. We derive from radiative hydrodynamic (RHD) simulations of RSG stars carried out with CO5BOLD (Freytag...
Atmospheric dynamics and the mass loss process in red supergiant stars (2007)
Red supergiant stars represent a key phase in the evolution of massive stars. Recent radiative hydrodynamic simulations suggest that their atmospheres may be the location of large-scale convective...
The chemistry of compact planetary nebulae (2002)
We report high-sensitivity millimetre observations of several molecular species (13CO, HCN, HNC, CN, HCO+ and N2H+) in a sample of compact planetary nebulae. Some species such as HCO+ and CN are...