Interferometric Aperture Synthesis of Altair: Gravity Darkening and Inclination Angle

Armando Domiciano de Souza (1) , Pierre Kervella (2, 3) , Slobodan Jankov (4) , Farrokh Vakili (1) , Naoko Ohishi (5) , T. E. Nordgren (6) , Lyu Abe (1)

1 LAGRANGE - Joseph Louis LAGRANGE
2 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
3 Pôle Astronomie du LESIA
4 LUAN - Laboratoire Universitaire d'Astrophysique de Nice
5 NAOJ - National Astronomical Observatory of Japan
6 University of Redlands

We perform a physically consistent analysis of all interferometric data available for Altair in order to estimate two important parameters for this rapid rotator : (1) a gravity-darkening compatible with the expected value for hot stars (Teff∝ g 0.25; von Zeipel effect) and (2) an intermediate inclination for the rotation axis (i=55°±8° for our best model).

Domaines: Astrophysique [astro-ph]

Armando Domiciano de Souza, Pierre Kervella, Slobodan Jankov, Farrokh Vakili, Naoko Ohishi, et al.. Interferometric Aperture Synthesis of Altair: Gravity Darkening and Inclination Angle. The Power of Optical/IR Interferometry: Recent Scientific Results and 2nd Generation, Apr 2005, Garching, Germany. pp.487, ⟨10.1007/978-3-540-74256-2_59⟩. ⟨hal-03809506⟩