COMMISSION 27 OF THE I. A. U.
                  INFORMATION BULLETIN ON VARIABLE STARS
                               Number 2463

                                                    Konkoly Observatory
                                                    Budapest
                                                    20 January 1984
                                                    HU ISSN 0374 - 0676


    NEW DATA ON THE MOST RECENT MINIMUM OF THE X-RAY SOURCE KR Aur


  At the end of December 1981 the occurrence of a new minimum of the X-ray
source KR Aur was observed (Popov, 1982) in view of which a search was carried
out in the observatories' plate collections for new data after those presented
by Liller (1980), also to include the object's becoming fainter. A
total of 23 plates in the region of KR Aur were found in the plate collection 
of Harvard College Observatory (H) and that of Sonneberg Observatory (S)
for the time interval Jan. 1980 - March 1982.
  The magnitudes of the variable were estimated on the basis of Popova's
(1965) sequence. Table I contains the magnitudes and brighter limits from
all plates as a function of Julian Date.

                           Table I
J.D.244...   m_B   Obs.   J.D.244...     m_B   Obs.
4254.406     13.0   S      4693.327      13.0   S
4254.475     13.1   S      4854.568      13.6   S
4283.646     13.7   H      4908.861      13.5   H
4287.583     13.0   H      4933.793      14.8   H
4288.312     13.0   S      4958.740     (14.4   H
4290.401     13.1   S      5021.361      15.7   S
4308.552     13.5   H      5021.383      15.6   S
4545.495     13.0   S      5044.541     (14.4   H
4577.730     13.5   H      5052.343      15.8   S
4607.649     13.5   H      5052.412      15.6   S
4665.555     13.4   H      5052.582     (14.4   H
4690.535     13.3   H


                            [FIGURE 1]




  All the data from this study are plotted in Figure 1. The magnitudes 
estimated by Liller from the Harvard plates are shown as open circles, the
data obtained by Popova from the Sonneberg plates as full circles. In addition, 
as dots, are plotted the observations by the Bulgarian National Astronomical 
Observatory by Popova, Antov and Popov (1982) for the same time interval. 
The observations complement each other very well. A steeper decrease
of the brightness was more apparent than its increase.




        MARTHA H. LILLER             M.D. POPOVA
        Harvard-Smithsonian Center   Department of Astronomy with
        for Astrophysics             National Astronomical Observatory
        Cambridge                    Bulgarian Academy of Sciences
        Massachusetts, 02138 USA     Bulgaria





References:

Liller, M.H. 1980, Astron. J., 85, 1092. [BIBCODE 1980AJ.....85.1092L ]
Popova, M.D. 1965, Perem. Zvezdy, 15, 534. [BIBCODE 1965PZ.....15..534P ]
Popova, M.D., Antov, A.P. and Popov, V.N. 1982, In: "Magnetic and Variable
   Stars", eds. M. Marik and L. Szabados, 
   Commun. Konkoly Obs. Hung. Acad. Sci., No. 83, Budapest, p. 220. [BIBCODE 1982CoKon..83..220P ]
							[CoKon No. 83]
Popov, V.N. 1982, Inf. Bull. Var. Stars, No. 2095.