Exploring the multifaceted circumstellar environment of the Luminous
  Blue Variable HR Carinae
  We present a multi-wavelength study of the Galactic Luminous Blue Variable HR
Carinae, based on new high resolution mid-infrared (IR) and radio images
obtained with the Very Large Telescope (VLT) and the Australia Telescope
Compact Array (ATCA), which have been complemented by far-infrared
Herschel-PACS observations and ATCA archive data. The Herschel images reveal
the large-scale distribution of the dusty emitting nebula, which extends mainly
to the North-East direction, up to 70 arcsec from the central star, and is
oriented along the direction of the space motion of the star. In the
mid-infrared images, the brightness distribution is characterized by two
arc-shaped structures, tracing an inner envelope surrounding the central star
more closely. At radio wavelengths, the ionized gas emission lies on the
opposite side of the cold dust with respect to the position of the star, as if
the ionized front was confined by the surrounding medium in the North-South
direction. The comparison with previous data indicates significant changes in
the radio nebula morphology and in the mass-loss rate from the central star,
which has increased from 6.1$\times10^{-6}$ M$_{\odot}$yr$^{-1}$ in 1994-1995
to $1.17\times10^{-5}$ M$_{\odot}$yr$^{-1}$ in 2014. We investigate possible
scenarios that could have generated the complex circumstellar environment
revealed by our multi-wavelength data.
