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| Paper: |
A Survey of Be Star Circumstellar Disks Using the CHARA Array
Long Baseline Interferometer |
| Volume: |
465, Four Decades of Massive Star Research - A Scientific Meeting in Honor of Anthony J. Moffat |
| Page: |
108 |
| Authors: |
Touhami, Y.; Gies, D. R.; Schaefer, G. H.; Richardson, N. D.; McAlister, H. A.; Ridgway, S. T.; ten Brummelaar, T. A.; Goldnger, P. J.; Sturmann, L.; Sturmann, J.; Turner, N. H.; Farrington, C. D. |
| Abstract: |
We present spatially resolved observations of circumstellar disks of 24 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 were fitted with a physical thick disk model where the disk gas density steeply decreases with radius. Physical and geometrical properties such as the density profile, the inclination and the position angles of the circumstellar disks were determined. We find that the disk density index varies between
n ∼= 2.4–3.2, which is consistent with previous IRAS measurements. In addition to the interferometric observations, we have obtained simultaneous optical and near-IR spectrophotometry data taken at Lowell Observatory, and we show that the thick disk model reproduces well the disk IR flux excess detected spectrophotometrically. By combining the projected rotational velocity of the Be star with the disk inclination derived from interferometry, we were able to estimate the equatorial rotational velocities of our sample stars. |
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