EDP Sciences
Free Access
Volume 412, Number 3, December IV 2003
Page(s) 735 - 743
Section Formation, structure and evolution of stars
DOI https://doi.org/10.1051/0004-6361:20031449

A&A 412, 735-743 (2003)
DOI: 10.1051/0004-6361:20031449

Bispectrum speckle interferometry of the massive protostellar outflow source AFGL 2591

T. Preibisch1, Y. Y. Balega2, D. Schertl1 and G. Weigelt1

1  Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
2  Special Astrophysical Observatory, Nizhnij Arkhyz, Zelenchuk region, Karachai-Cherkesia, 357147, Russia

(Received 10 June 2003 / Accepted 28 August 2003)

We present bispectrum speckle interferometry of the massive protostellar object AFGL 2591 in the near-infrared K-band. Our reconstructed image of the outflow cavity of AFGL 2591 has a resolution of 170 mas, corresponding to physical scales of $\sim $170 AU at the distance of the object, and shows the loops which extend from the bright, compact source in unprecedented detail. The central source is clearly resolved and has an uniform-disk diameter of $\sim $40 mas (40 AU). We use 2D radiation transfer simulations to show that the resolved structure probably corresponds to the inner rim of a geometrically thick circumstellar disk or envelope at the dust sublimation radius. Our image also reveals a structure that might represent an edge-on circumstellar disk around one of the other young stellar objects near AFGL 2591.

Key words: techniques: interferometric -- stars: individual: AFGL 2591 -- stars: formation -- stars: winds, outflows

Offprint request: T. Preibisch, preib@mpifr-bonn.mpg.de

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