First Observations of the Be Star α Ara with the VLTI

Details First Observations of the Be Star α Ara with the VLTI First Observations of the Be Star α Ara with the VLTI

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..361..300s&link_type=abstract

Active OB-Stars: Laboratories for Stellar and Circumstellar Physics, ASP Conference Series, Vol. 361, Proceedings of the confere

Physics

Scientific paper

We aim to study the geometry and kinematics of the disk around the Be star α Arae as a function of wavelength, especially across the Brγ emission line. We use both the VLTI/MIDI and VLTI/AMBER instruments operating respectively in the N and K bands. Moreover, we have combined the high angular resolution provided with the (medium) spectral resolution of AMBER to study the kinematics of the inner part of the disk and to infer its rotation law. We obtain for the first time the clear evidence that the disk is in Keplerian rotation, closing a debate that occurs since the discovery of the first Be star γ Cas by father Secci in 1866. We found that the disk around α Arae is compatible with a dense equatorial matter confined in the central region whereas a polar wind is contributing to the global flux along the rotational axis of the central star.

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