Preprint Logo P80 February
2003


To be published in:
Astronomy & Astrophysics Letters

VLT observations of the highly ionized nebula around Brey2(+)

Y. Nazé1,*, G. Rauw1,**, J. Manfroid1,***, Y.-H. Chu2 and J.-M. Vreux1


1 Institut d'Astrophysique et de Géophysique - Université de Liège, Allée du 6 Août, Bât B5c, B-4000 Liège (Sart Tilman), Belgium
2 Astronomy Department, University of Illinois at Urbana-Champaign, 1002 West Green Street, Urbana, IL 61801, USA

* Research Fellow FNRS, Belgium
** Research Associate FNRS, Belgium
*** Research Director FNRS, Belgium

+ Based on observations collected at the European Southern Observatory, Cerro Paranal, Chile (ESO No. 68.C-0238(A,B)).


Abstract

     We present the first high resolution He II 4686 images of the high excitation nebula around the WR star Brey 2 in the LMC. This nebula presents a striking morphology: a small arc-like feature some 3.6 pc in radius is particularly prominent in the He II 4686 line. We further discover a previously unknown faint He II emission that extends over an area of 22x17 pc2. An even fainter He II emission is apparently associated with the interstellar bubble blown by the progenitor of Brey2. The total He II flux corresponds to an ionizing flux of 4x1047 photons s-1. H, [O III] and He I 5876 images and long-slit spectra are also examined in this letter, enabling us to investigate the detailed physical properties at various locations of the nebula.

Key Words
Stars: individual: Brey2 - ISM: bubbles - ISM: abundances - ISM: supernova remnants

Files
Article: fa061.pdf (1958852 bytes): HTTP FTP (ftp://vela.astro.ulg.ac.be/preprints/)


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