The spectra of LS 992 in the classification region are displayed in Fig. 1 . It has been included, however, so that the obvious changes can be observed. In the October 1999 spectrum H is strongly in emission, with an asymmetric blue-dominated profile, while similarly asymmetric emission components are present in the cores of all Balmer lines down to H .
Photospheric lines are all shallow and broad indicating a fast rotator.
However, given the high SNR of the spectrum even the weakest metallic lines are detected. If the star was in the main sequence, it would indicate a spectral type B0.5V or later. This seems to indicate a higher luminosity class. The smooth progression of all the He II lines favours a spectral classification B0.2III for LS 992. However, some metallic lines seem weaker than expected and a luminosity class IV sounds more appropriate.