We would like to add a last comment upon the group into which HD 45677 has been classified. It has usually been put either in the group of B[e] stars or in the group of Herbig Be-Ae stars. From the definitions of the groups (see Jaschek & Jaschek 1987), it is difficult to conclude that the object belongs clearly to either one of them. It has certainly many forbidden lines in emission, as required by B[e] stars, but contrary to other stars of the group, one perceives the photospheric spectrum of the underlying star. With regard to the membership in the group of Herbig Be-Ae stars, one of the original criteria was the existence of an associated nebulosity, which in HD 45677 is absent. It is thus not a Herbig Be-Ae star.
The fact that the three stars analysed in this series (MWC 51585, MWC 349A and MWC 645) do not show any absorption lines, whereas HD 45677 (as well as HD 50138) do show absorption lines, provides a clear indication of (at least) two subgroups of B [e] stars. Until many more stars of the group are analysed, it seems premature to call HD 45677 (or MWC 645) the typical B[e] star. Caution is thus be recommended and one should not apply whatever is known on this particular star to other B[e] stars.
Acknowledgements
The authors thank Mr. J. Marcout from the Strasbourg Observatory for drawing Figs. 2 (click here) and 3 (click here) and to Mr. Ph. Moreau from the Haute Provence Observatory for the reproduction of the spectra (Figs. 1 (click here)a and 1 (click here)b). We wish to thank the referee, Dr. J.P. Swings for his useful remarks.