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Circumstellar environment of Herbig Ae/Be stars as seen by the IOTA

Millan-Gabet, Rafael and Schloerb, F. Peter and Traub, Wesley A. (2000) Circumstellar environment of Herbig Ae/Be stars as seen by the IOTA. In: Interferometry in Optical Astronomy. Proceedings of SPIE. No.4006. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, pp. 605-616. ISBN 9780819436313.

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We have conducted the first systematic study of Herbig Ae/Be stars using the technique of long baseline stellar interferometry. The Infrared Optical Telescope Array resolves the source of the near-infrared excess flux characteristic of these systems in 11 of the 15 stars observed. A close companion to MWC 361-A (18 mas separation) has been detected interferometrically for the first time. The visibility data has been interpreted within the context of four models which represent the range of plausible representations for the brightness of the excess emission: a Gaussian distribution, a narrow uniform ring, an accretion disk, and an infrared companion. We find that the large sizes measured by the interferometer, 0.5 - 5.9 AU, essentially invalidate accretion disk models that had been previously used to explain the spectroscopic observations. Although a unique model can not be determined for each source due to limited spatial frequency coverage, the observed symmetry of the sources favors, for the ensemble of the data, models in which the circumstellar dust is distributed in spherical envelopes.

Item Type:Book Section
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Millan-Gabet, Rafael0000-0003-0447-5866
Additional Information:© 2000 Society of Photo-optical Instrumentation Engineers.
Subject Keywords:Interferometer, IOTA, Herbig Ae/Be stars, infrared excess, cicumstellar dust, accretion disk, dust envelopes
Series Name:Proceedings of SPIE
Issue or Number:4006
Record Number:CaltechAUTHORS:20181219-134554702
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Official Citation:Rafael Millan-Gabet, F. Peter Schloerb, Wesley A. Traub, "Circumstellar environment of Herbig Ae/Be stars as seen by the IOTA," Proc. SPIE 4006, Interferometry in Optical Astronomy, (5 July 2000); doi: 10.1117/12.390260
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91919
Deposited By: Tony Diaz
Deposited On:19 Dec 2018 22:13
Last Modified:03 Oct 2019 20:39

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