Bispectrum speckle interferometry of the B[e] star MWC 349A

Details Bispectrum speckle interferometry of the B[e] star MWC 349A Bispectrum speckle interferometry of the B[e] star MWC 349A

2002-09-25

arxiv.org/abs/astro-ph/0209533v1

Astron.Astrophys. 395 (2002) 891-898

Astronomy and Astrophysics

Astrophysics

8 pages, 16 figures, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20021351

We present the results of bispectrum speckle interferometry of the B[e] star MWC 349A obtained with the SAO 6m telescope. Our diffraction-limited J-, H-, and K-band images (resolutions 43--74 mas) suggest the star is surrounded by a circumstellar disk seen almost edge-on. The observed visibility shape is consistent with a two-component elliptical disk model, probably corresponding to the gaseous and dusty components of the disk. We show that the classification of the object as a pre-main-sequence star or a young planetary nebula is problematic. An analysis of the uncertainties in the basic parameter determination lead us to the conclusion that MWC 349A is probably either a B[e] supergiant or a binary system, in which the B[e]-companion dominates the observed properties.

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