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Astron. Astrophys. 353, 153-162 (2000)

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Multi-wavelength imaging of the peculiar Vela Molecular Ridge nebula BBW 192E *

A. Burkert 1, B. Stecklum 2, Th. Henning 1 and O. Fischer 3

1 Astrophysical Institute and University Observatory Jena (AIU), Schillergässchen 2-3, 07745 Jena, Germany (alf@astro.uni-jena.de)
2 State Observatory of Thuringia, Sternwarte 5, 07778 Tautenburg, Germany
3 Institute for Didactics in Physics and Astronomy, Friedrich Schiller University Jena, August-Bebel-Strasse 4, 07745 Jena, Germany

Received 20 October 1998 / Accepted 1 October 1999

Abstract

We present the first images of the nebula BBW 192E at near- and mid-infrared wavelengths as well as a 1.3 mm continuum map. The nebula BBW 192E is associated with the IRAS point source 08513-4201 which has a luminosity of about 1400 [FORMULA] and a strongly rising spectral energy distribution towards mid-infrared wavelengths. The infrared images show a pronounced bipolar nebula, which is offset by about 10" from the known optical emission, as well as several point sources. We interpret this morphology as evidence for an inclined disk-like structure and scattered light emerging from the lobes. This is supported by our near-infrared imaging polarimetry at sub-arcsecond resolution which furthermore indicates that the central energy source is seen directly at near-infrared wavelengths.

At 1.3 millimetre, we detected a cometary shaped source in the dust continuum radiation, 151"x 55" in size, with a total mass of 180 [FORMULA] as well as average hydrogen column and number densities of 4.5x1022 cm-2 and 2.6x105 cm-3, respectively. This dust cloud is also responsible for the strong spatial variation of the extinction across the nebula.

We discuss the physical properties of the infrared point sources and conclude that some might be young, low-mass pre-main sequence stars. The main energy source of the nebula is an embedded intermediate-mass young stellar object.

These observations are among the first infrared detections of a disk-like system associated with a bipolar nebula surrounding an intermediate-mass young stellar object.

Key words: stars: formation – stars: pre-main sequence – ISM: clouds – ISM: dust, extinction – radio continuum: ISM – stars: circumstellar matter

* Based on observations collected at the European Southern Observatory, La Silla, Chile (Proposal-IDs: 57.B-0392, 52.7-0086, 57.D-0260, 58.D-0213, and 63.I-0173)

Send offprint requests to: A. Burkert

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© European Southern Observatory (ESO) 2000

Online publication: December 8, 1999
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