Follow-Up of Extended Shells around B[e] Stars
  B[e] stars are massive B type emission line stars in different evolutionary
stages ranging from pre-main sequence to post-main sequence. Due to their mass
loss and ejection events these objects deposit huge amounts of mass and energy
into their environment and enrich it with chemically processed material,
contributing significantly to the chemical and dynamical evolution of their
host galaxies. However, the large-scale environments of these enigmatic objects
have not attracted much attention. The first and so far only catalog reporting
the detection of extended shells around a sample of B[e] stars was an Ha
imaging survey carried out in the year 2001, and was limited to bright targets
in the northern hemisphere. We have recently started a follow-up of those
targets to detect possible evolution of their nebulae in the plane of the sky
over a baseline of two decades. Furthermore, we extend our survey to southern
targets and fainter northern ones to complement and complete our knowledge on
large-scale ejecta surrounding B[e] stars. Besides imaging in Ha and selected
nebular lines, we utilize long-slit and 3D spectral observations across the
nebulae to derive their physical properties. We discovered pronounced nebula
structures around 15 more objects, resulting in a total of 27 B[e] stars with a
large-scale nebula. Here we present our (preliminary) results for three
selected objects: the two massive supergiants MWC137 and MWC 314, and the
unclassified B[e] star MWC 819.
