COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                    Number 1330

                                  Konkoly Observatory
                                  Budapest
                                  1977 August 18



          NOTE ON V 644 Cen = HD 306989 (B3)


   This variable star, investigated by O'Connell (1) and
Gaposchkin (2), was suspected to be an eclipsing variable. They
found a descending branch to a deep minimum in 1950 with an
amplitude from 9.55m - 10.25m pg. No later observations have been
published.
    An examination - with Argelander-step-method - of 271
Bamberg Sky Survey plates leads to the 100d - mean magnitudes
of the table. The star returned to a new maximum light of 8.86m pg.
Used comparison stars are
      CPD - 59d3803 (B8) 8.42m pg
      CPD - 59d3734 (B8) 9.19m pg

           Table of observations
Date (J.D.)       Mag.(pg.)      N
2438472d       8.90m +- 0.12m    26
    527        8.85     0.06     46
    791        8.88     0.09      6
    859        8.82     0.12     37
    907        8.86     0.08     11
  39180        8.74     0.11      8
    237        8.87     0.09     32
    569        8.91     0.11      7
    629        8.93     0.09      3
    948        8.82     0.08     13
  40285        8.83     0.07      4
    350        8.86     0.12     11
    670        8.86     0.11     32
    726        8.90     0.13      7
  41064        8.83     0.11     18
    174        8.78     0.06      4
  42718        8.97     0.06      3
N = number of plates


                              U. HOPP and M. KIEHL
                              Dr. Remeis Sternwarte
                                     Bamberg

References:
(1) O'Connell - MN RAS Vol. 111, 111 (1951) [BIBCODE 1951MNRAS.111..111O ]
(2) Gaposchkin - HA Vol. 113, 2 (1953) [BIBCODE 1953AnHar.113...67G ]