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On the determination of the rotational oblateness of Achernar

CARCIOFI, A. C.; SOUZA, A. Domiciano de; MAGALHAES, A. M.; BJORKMAN, J. E.; VAKILI, F. (UNIV CHICAGO PRESS, 2008)

The recent interferometric study of Achernar, leading to the conclusion that its geometrical oblateness cannot be explained by the Roche approximation, has stirred substantial interest in the community, in view of its ...

VLTI/PIONIER images the Achernar disk swell

Vedova, G. Dalla; Millour, F.; Souza, A. Domiciano de; Petrov, R. G.; Faes, D. Moser; Carciofi, A. C.; Kervella, Pierre; Rivinius, T. (EDP Sciences, 2017-05)

Context. The mechanism of disk formation around fast-rotating Be stars is not well understood. In particular, it is not clear which mechanisms operate, in addition to fast rotation, to produce the observed variable ejection ...

Beyond the diffraction limit of optical/IR interferometers I. Angular diameter and rotation parameters of Achernar from differential phases

de Souza, A. Domiciano; Hadjara, M.; Vakili, F.; Bendjoya, P.; Millour, F.; Abe, L.; Carciofi, Alex Cavalieri; Faes, D. M.; Kervella, P.; Lagarde, S.; Marconi, A.; Monin, J. -L.; Niccolini, G.; Petrov, R. G.; Weigelt, G. (EDP SCIENCES S ALES ULIS CEDEX A, 2012)

Context. Spectrally resolved long-baseline optical/IR interferometry of rotating stars opens perspectives to investigate their fundamental parameters and the physical mechanisms that govern their interior, photosphere, and ...

Variable rotational line broadening in the Be star Achernar

Rivinius, Th.; Baade, D.; Townsend, R.H.D.; Carciofi, Alex Cavalieri; Stefl, S. (EDP SciencesLes Ulis, 2013)

Aims. The main theoretical problem for the formation of a Keplerian disk around Be stars is how angular momentum is supplied from the star to the disk, even more so since Be stars probably rotate somewhat subcritically. ...