EDP Sciences Journals List
Advanced Search
Subscriber Authentication Point
Home All issues Volume 427/2 Article
Free access article

Issue A&A
Volume 427, Number 2, November IV 2004
Page(s) 505 - 518
Section Interstellar and circumstellar matter
DOI http://dx.doi.org/10.1051/0004-6361:20034438



A&A 427, 505-518 (2004)
DOI: 10.1051/0004-6361:20034438

Near-IR speckle imaging of massive young stellar objects

C. Alvarez1, 2, 3, M. Hoare1, A. Glindemann4 and A. Richichi4

1  School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, UK
2  Kapteyn Astronomical Institute, Postbus 800, 9700 AV Groningen, The Netherlands
3  Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
    e-mail: alvarez@mpia-hd.mpg.de
4  European Southern Observatory, Karl-Schwarzschildstr. 2, 85748 Garching bei München, Germany

(Received 2 October 2003 / Accepted 17 June 2004 )

Abstract
We present near-IR speckle images of 21 massive Young Stellar Objects (YSOs) associated with outflows. The aim of this study is to search for sub-arcsecond reflection nebulae associated with the outflow cavity. We find that 6 of the massive YSOs show a conical nebula which can be interpreted in terms of reflected light from the dusty walls of the outflow cavity. In all cases, the small scale structures seen in our images are compared with outflow indicators found in the literature. No clear correlation is found between the presence of the reflection nebulosity and any property such as degree of embeddedness. We also note that 3 of the sources show close companions, one of them belonging also to the sample with conical nebula.


Key words: scattering -- techniques: high angular resolution -- stars: formation -- stars: winds, outflows -- reflection nebulae -- infrared: stars

SIMBAD Objects



© ESO 2004


What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.
  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.