Publications of the MPIfR Optical & Infrared Interferometry Group

A. Domiciano de Souza

Rapid rotation across the HR diagram with VLTI: Achernar and Altair

"ESO Astrophysics Symposia"
Proceedings of the ESO Workshop: "The power of optical/IR interferometry: recent scientific results and 2nd generation VLTI instrumentation"
April 4-8, 2005 in Garching, Germany
pg.55-59 (2008)

Abstract
Rapid rotation effects can nowadays be directly measured by stellar interferometry. We present our recent high-quality interferometric data recorded with VLTI/VINCI on two rather different rapidly rotating stars: Achernar (B3Vpe star) and Altair (A7IV-V star). By using a first-order analysis (equivalent uniform disc model) we estimate the oblateness of these stars. For Altair, we also perform a comparison with observations from other modern interferometers (PTI and NPOI), finding a good agreement between the data from these 3 interferometers.

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