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Direct Observations of Rotationally Distorted Stars

Published online by Cambridge University Press:  26 May 2016

Gerard T. van Belle ,
David R. Ciardi ,
Robert R. Thompson  and
Rachel L. Akeson
Gerard T. van Belle
Affiliation:
Michelson Science Center, California Institute of Technology, 770 South Wilson Ave MS 100-22, Pasadena, CA 91125
David R. Ciardi
Affiliation:
University of Florida, Department of Astronomy, 211 Bryant Space Sciences, Gainesville, FL 32611
Robert R. Thompson
Affiliation:
Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive MS 171-113, Pasadena, CA 91109
Rachel L. Akeson
Affiliation:
Michelson Science Center, California Institute of Technology, 770 South Wilson Ave MS 100-22, Pasadena, CA 91125

Abstract

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We present infrared interferometric angular size measurements for rapidly rotating stars which indicate non-circular projected disk brightness distributions. For the A7IV-V star Altair, assuming that the apparent oblateness of the photosphere is due to the star's rapid rotation, a rigorous evaluation of the observation data in the context of a rigidly rotating Roche model shows that an estimate of v sin i = 210 ± 13 km s–1 can be derived that is independent of spectroscopic techniques. Altair is the first main sequence star for which direct observations of an oblate photosphere have been reported, and the first star for which v sin i has been established from observations of the star's photospheric geometry. Future prospects for this technique are considered, and a prospective catalog of 67 rotationally oblate targets is presented.

Type
Session 1 Observations of Rotating Stars
Information
Symposium - International Astronomical Union , Volume 215: Stellar Rotation , 2004 , pp. 177 - 186
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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