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

Preibisch, Th. and Beuther, H. and Hofmann, K.-H. and Meyer, M. and Schertl, D. and Smith, M.D. and Weigelt, G. and Young, E.T. (2005) Bispectrum speckle interferometry of the massive protostellar outflow source IRAS 23151+5912. In: Astronomische Nachrichten. Wiley-VCH Verlag p. 570. (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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Abstract

We present bispectrum speckle interferometry of the massive protostellar object IRAS 23151+5912 in the near-infrared K? band. Our image shows the diffuse nebulosity north-east of two bright, point-like sources in unprecedented detail. By comparing our near-infrared image with mm continuum and CO molecular line radio maps we find that the brighter of the two point sources lies near the center of the mm peak, indicating that it is a massive protostar. The nebulosity coincides with the blueshifted molecular outflow component. The most prominent feature in the nebulosity is a bow-shock-like arc, pointing towards the bright point source. We suspect 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 narrow linear structure connecting the central point source to the extended diffuse nebulosity. This feature may represent the innermost parts of a jet that drives the strong molecular outflow 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, as well as the relative strength of shocked and reflected emission components.

Item Type: Conference or workshop item (UNSPECIFIED)
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 09:35 UTC
Last Modified: 29 Oct 2018 12:18 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/50112 (The current URI for this page, for reference purposes)
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