Bispectrum speckle interferometry of the massive protostellar outflow source IRAS 23151+5912

Weigelt, G. and Beuther, H. and Hofmann, K.-H. and Meyer, M.R. and Preibisch, Th. and Schertl, D. and Smith, M.D. and Young, E.T. (2006) Bispectrum speckle interferometry of the massive protostellar outflow source IRAS 23151+5912. Astronomy and Astrophysics, 447 (2). pp. 655-665. ISSN 0004-6361. E-ISSN 1432-0746. (doi:https://doi.org/10.1051/0004-6361:20053817) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
http://dx.doi.org/10.1051/0004-6361:20053817

Abstract

We present bispectrum speckle interferometry of the massive protostellar object IRAS 23151+5912 in the near-infrared K? band. The reconstructed image shows the diffuse nebulosity north-east of two point-like sources in unprecedented detail. The comparison of our near-infrared image with mm continuum and CO molecular line maps shows that the brighter of the two point sources lies near the center of the mm peak, indicating that it is a high-mass protostar. The nebulosity coincides with the blue-shifted molecular outflow component. The most prominent feature in the nebulosity is a bow-shock-like arc. We assume that this feature is associated with a precessing jet which has created an inward-pointed cone in the swept-up material. We present numerical jet simulations that reproduce this and several other features observed in our speckle image of the nebulosity. Our data also reveal a linear structure connecting the central point source to the extended diffuse nebulosity. This feature may represent the innermost part of a jet that drives the strong molecular outflow (PA ? 80°) from IRAS 23151+5912. With the aid of radiative transfer calculations, we demonstrate that, in general, the observed inner structures of the circumstellar material surrounding high-mass stars are strongly influenced by the orientation and symmetry of the bipolar cavity.

Item Type: Article
Uncontrolled keywords: Stars: formation, Techniques: interferometric
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: Giles Tarver
Date Deposited: 11 Aug 2015 09:32 UTC
Last Modified: 29 Oct 2018 12:18 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/50109 (The current URI for this page, for reference purposes)
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