To be published in:
Astronomy & Astrophysics Letters
VLT observations of the highly ionized nebula around Brey2(+)
Y.-H. Chu2 and
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)).
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.
Stars: individual: Brey2 - ISM: bubbles - ISM: abundances -
ISM: supernova remnants