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Luminous blue variable stars (LBVs) are of great interest in massive-starevolution as they experience very high mass-loss episodes within short periodsof time. HR Car is a famous member of this class in the Galaxy. It has a largecircumstellar nebula and has also been confirmed as being in a binary system.One means of gaining information about the evolutionary status and physicalnature of LBVs is studying their environments. We investigated the stellarcontent within ~100 pc of HR Car and also its circumstellar nebula. Very LargeTelescope (VLT) Multi Unit Spectroscopic Explorer (MUSE) observations of a2'x2' region around the star highlight the incompleteness of stellarclassification for stars with magnitudes of V > 13 mag. Eight B0 to B9 starshave been identified which may lie in close spatial vicinity to HR Car. For aregion with a radius of r =1.2 degree (~100 pc at a distance of 4.8 kpc) aroundHR Car, existing catalogs list several late O-type and early B-type stars, butonly one early O-type star. Given the relatively low stellar and nebular massesin the HR Car system, no early O-type stars and only a few late O-type starswould be expected in association with HR Car. Instead, HR Car's location in apoint vector diagram suggests that HR Car is not isolated, but is part of amoving group with a population of B-type stars in a spiral arm, and it has notreceived a strong kick from a supernova explosion of a companion star or amerger event. Potential binary evolution pathways for the HR Car system cannotbe fully explored because of the unknown nature of the companion star.Furthermore, the MUSE observations reveal the presence of a fast outflow and"bullets" that have been ejected at intervals of about 400 years. Thesefeatures may have been caused by recurrent mass transfer in the system.

LBV phenomenon and binarity: The environment of HR Car