Probing The Circumstellar Environments Of Be Stars With The Chara Array

Details Probing The Circumstellar Environments Of Be Stars With The Chara Array Probing The Circumstellar Environments Of Be Stars With The Chara Array

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21740603t&link_type=abstract

American Astronomical Society, AAS Meeting #217, #406.03; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the first spatially resolved observations of circumstellar envelopes of 25 bright northern Be stars. The survey was performed with the CHARA Array interferometer in the K-band at intermediate and long baselines. The interferometric visibilities are well fitted by a viscous disk model where the gas density steeply decreases with the radius. Physical and geometrical parameters such as the density profile, the inclination, and the position angles of the circumstellar disks are determined. We find that the density radial exponent ranges between: n ≈ 2.4-3.2, which is consistent with previous IRAS measurements. By combining the projected rotational velocity of the Be star with the disk inclination derived from interferometry, we give estimates of the equatorial rotational velocities of these Be stars.

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