COMMISSION 27 OF THE I.A.U.
             INFORMATION BULLETIN ON VARIABLE STARS
                          Number 1247

                                                  Konkoly Observatory
                                                  Budapest
                                                  1977 March 7


       2 Pup B: A NEW BRIGHT ECLIPSING BINARY

2 Pup B (HR 3009, HD 62863) was found by Andersen and
Nordstrom (1977, A. & A. Suppl., in press) to be a double-lined
spectroscopic binary with equal components and fairly diffuse
lines.
   On J. Andersen's recommendation a search for eclipses was
carried out in November 1976 by the author, using the Danish
50 cm telescope at La Silla, Chile, equipped with a four-channel
spectrophotometer. Filters of the Stromgren uvby system were 
employed.
   It was found that 2 Pup B is an eclipsing binary. A 
preliminary period of 1.660 days has been determined from observations 
of several eclipses. The two minima are almost identical,
the depths in y in the instrumental system, which should be very
close to the standard system, are about 0m.40 and 0m.41. The duration 
of eclipses is about 4 hours 15 minutes. The secondary minimum 
is displaced at phase 0.48, thus indicating a slightly eccentric 
orbit.
   Stromgren indices for 2 Pup B are given by Gronbech and
Olsen (1976, A. & A. Suppl. 25, 213), who find V = 6.894, b-y =
= 0.201, m1 = 0.165, c1 = 0.634. The MK type (Cowley et al., 1969,
A.J.. 74, 375) is A8V.
   2 Pup B is the secondary component of the visual binary
HR 3009-10 (Struve 1138, Aitken 6348), with an angular separation 
of 16.9".
   Further observations of this system are planned.


                                  BO REIPURTH
                        Copenhagen University Observatory