COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                     NUMBER 641

                                   Konkoly Observatory
                                   Budapest
                                   1972 March 14


        HR 3327 - AN ECLIPSING BINARY WITH ECCENTRIC ORBIT


During photoelectric observations of AS Vel on the night Feb. 3-4, 1972, the
check star

HR 3327 = HD 71487 (A0)= CoD -38deg4462

was found to be an eclipsing binary of Algol-type. The observations were
made with a four-channel photometer attached to the Copenhagen 50 cm telescope
at European Southern Observatory, La Silla, Chile. Filters of the Stromgren
four-colour ubvy system were employed. HR 3327 has now been observed on seven
nights with the result that two primary minima and one secondary minimum were
obtained (Table 1).

Table 1.

Times of heliocentric minima.

MinI JD 244 1351.7094+-0.0007
   II       1353.6976+-0.0014
   I        1361.7643+-0.0007

HR 3327 is the primary component of the visual binary HR 3327-8 (m_V(A) =
6.68m, m_V(B)=7.28m, distance= 8."1). Because of the small distance the
combined light of both components was measured through a diaphragm with a
diameter of 30". In the Figure the magnitude difference m_b(A+B)-m_B(comp) is
given by the scale to the left: the comparison star and check star were CoD
-38deg4561 (7.2m, B9) and CoD -38deg4515 (8.5m, F5) respectively. The phases
were computed according to the ephemeris given below. The secondary component
was measured separately on nights with good seeing through a small diaphragm,
and in the scale to the right the light of the secondary has been subtracted
(Delta y(max)=0.67m).

The depths of the two minima in the instrumental system, which should be very
close to the standard system, are given in Table 2. The duration of primary
eclipse is about four hours corresponding to a fraction of 0.13 of the
preliminary period. The secondary minimum is displaced to phase 0.582
indicating an eccentric orbit.

Table 2.

Depths of minima.

        u        v      b        y
Min I  0.45m   0.44m   0.44m   0.45m
   II  0.06    0.09    0.12    0.12
       m.e.= 0.01m

Five coude-spectra of 12 A/mm taken on four different nights by Dr. J.P. Swings
with the ESO 1.5 m spectrographic telescope show a single-lined spectrum of
probably a main-sequence star around B9. Preliminary radial-velocities show a
range of about 190 km/sec.

The combination of photometric and radial-velocity data gives the following
ephemeris:

Min I JD 244 1361.7643 +1.25686d.  E
                +-   7 +-    12
Min II - Min I = 0.582p.

The author is greatly indebted to Dr. J.P. Swings who generously gave some of
his observing time to an investigation of this object, and to Mr. E.H.
Olsen, who made some of the photoelectric observations.

A complete discussion of this system will be published later.

                         [FIGURE 1]

European Southern Observatory
La Silla.
Feb. 24, 1972

                                        B.G. JORGENSEN
                                        Copenhagen University Observatory