In the context of this object's lightcurve, the following article available online is of interest, as it contains lightcurve morphology details and some lightcurve examples for several similar objects http://cdsads.u-strasbg.fr/cgi-bin/nph-iarticle_query?1993Ap%26SS.202..137S MisV1147 seems to fit their 'P1' group quite nicely. (This paper seems to be a direct translation from a Russian original, given the appearance of terms like "light weakening" for drops in magnitude, etc. The following papers may also be of interest, but they are not available online, and are probably in Russian(???) > 1997PAZh...23..371K > Herbig Ae stars with Algol-type minima: modeling of the spectral energy distributions and of the color > behavior at minima. > KRIVOVA N.A. > 1997PAZh...23..908K > Dust shells around Herbig Ae/Be stars with Algol-like minima: modeling of photometric observations. > KRIVOVA N.A., IL'IN V.B. > 1997PAZh...23..918M > Quasi-periodic light variations in four Herbig Ae/Be stars. > MEL'NIKOV S.Y. Cheers John Greaves