Hg. Grothues et L. Kohoutek, PHOTOMETRIC-OBSERVATIONS OF THE CENTRAL STAR OF THE PLANETARY-NEBULA NGC-2346 IN 1991 1992/, Astronomische Nachrichten, 314(4), 1993, pp. 297-301
Photoelectric UBV observations of the central star of the planetary ne
bula NGC 2346 obtained during 60 nights between October 1991 and Febru
ary 1992 are presented (Tables 1 and 2). Four minima have been stated
and can be interpreted in terms of occulting dust clouds, probably rep
resenting dense condensations of the planetary nebula. We derived R =
A(V)/E(B-V) = 4.0.