The star CD-42 \mn@boldsymbol { \degr } 11721 is a curious B [ e ] star sometimes pointed as an evolved B [ e ] supergiant and sometimes as a young HAeBe star , due to very uncertain or even unknown stellar parameters , especially the distance .
In this paper , we present new data gained from high-resolution optical spectroscopy and a detailed description of IR data of this star .
We present a qualitative study of the numerous emission lines in our optical spectra and the classification of their line profiles , which indicate a non-spherically symmetric circumstellar environment .
The first real detection of numerous [ Fe ii ] emission lines and of many other permitted and forbidden emission lines is reported .
From our optical data , we derive an effective temperature of T _ { eff } = 14 000 \pm 1 000 K , a radius of R _ { * } = 17.3 \pm 0.6 R _ { \odot } , as well as a luminosity of L _ { * } = ( 1.0 \pm 0.3 ) \times 10 ^ { 4 } L _ { \odot } .
We advocate that CD-42 \mn@boldsymbol { \degr } 11721 might be a post-main sequence object , even though a pre-main sequence nature can not be ruled out due to the uncertain distance .
We further found that the SED in the optical and infrared can best be fitted with an outflowing disk-forming wind scenario rather than with a spherical symmetric envelope or with a flared disc , supporting our tentative classification as a B [ e ] supergiant .