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

Abstract

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.

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

References in corpus (2)

• Spectroscopic observations of the candidate sgB[e]/X-ray binary CI Cam
• Spectropolarimetric Clues to the Structure and Evolutionary Status of MWC 349A

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• Kinematical structure of the circumstellar environments of galactic B[e]-type stars
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• The circumstellar environment and evolutionary state of the supergiant B[e] star Wd1-9
• Discovery of a parsec-scale bipolar nebula around MWC 349A
• AMBER/VLTI observations of the B[e] star MWC 300
• Changes in the Radio Appearance of MWC 349A
• Modelling the asymmetric wind of the luminous blue variable binary MWC 314
• Discovery of a Photoionized Bipolar Outflow towards the Massive Protostar G45.47+0.05
• Tracers of Discs and Winds around Intermediate and High Mass Young Stellar Objects
• Evidence of an evolved nature of MWC 349A
• The Spatially Resolved Hα-Emitting Wind Structure of P Cygni
• Near-infrared line spectropolarimetry of hot massive stars
• Herschel Planetary Nebula Survey (HerPlaNS): Hydrogen Recombination Laser Lines in Mz 3
• Improved Constraints on the Disk Around MWC 349A from the 23-Meter LBTI
• Expanded Very Large Array observations of the H66α and He66α recombination lines toward MWC 349A
• Speckle interferometry of the HAeBe star V376 Cas