COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                     NUMBER 283

                                    Konkoly Observatory
                                    Budapest
                                    1968 June 14


          THE PERIOD OF V 346 AQUILAE


The period of the Algol-system V 346 Aql seemed to be constant since its
discovery 30 years ago, although. KOCH and KOCH (AJ 67, 462 (1962)) from one
photographically observed minimum found a period 2^d. 10^-6 shorter than the
one given in the GCVS 1968. Their elements are

Min I=JD 2427970.4525+1.^d106365*E

Observations in the following years show increasing negative O-C_1's against
these elements, and the accompanying plot of O-C_1 may lead one to suggest a
sudden shortening of period roughly at JD 2438500.

New elements were derived from 78 minima found in the literature (s.
References). 13 normal minima (Table) were obtained by grouping the individual
minima. Admitting the same weight to each of the normal minima, the following
elements were obtained:

Min I=JD 2427970.4647+1.^d1063633*E
               +-0038   +-0000005

O-C_2 in the table are residuals against these elements.

Moreover, instantaneous elements were calculated with normal minima I to X and
IX to XIII, respectively, giving

A) Min I=JD 2427970.4558+1.^d1063646*E
                  +-0040   +-0000005

B) Min I= D 2437862.4660+1.^d106357*(E-8941)
                  +-0021   +-000002

In the table, O-C_A and O-C_B are residuals against these instantaneous
elements.

          Normal minima of V 346 Aquilae

Number	Min (JD 243...)	O-C_1	O-C_2	O-C_A	O-C_B

I	3539.898	+0.d004	 0.d000	+0.d003
II	3900.573	+0.004	+0.001	+0.003
III	4213.670	 0.000	-0.003	-0.001
IV	4698.258	 0.000	-0.002	-0.001
V	5365.394	-0.002	-0.003	-0.003
VI	6073.470	 0.000	 0.000	 0.000
VII	6447.419	-0.002	-0.001	-0.002
VIII	6821.371	-0.001	 0.000	-0.002	-0.d013
IX	7862.465	+0.003	+0.006	+0.003	-0.001
X	8652.408	+0.001	+0.006	+0.002	+0.003
XI	9029.672	-0.005	 0.000	-0.004	-0.001
XII	9342.770	-0.008	-0.003	-0.008	-0.002
XIII	9715.614	-0.009	-0.003	-0.008	 0.000

                        [FIGURE 1]

References:

DOMKE,K., POHL,E. AN 281, 113 (1952); 
POHL,E. AN 282, 235 (1955);
ASHBROOK,J. AJ 57, 259 (1952);
KOCH,J.C., KOCH,R.H. loc. cit.;
RUDOLPH,R. AN 285, 162 (1960);
HUTH,H. MVS 3, 120 (1966);
        EBC 4 (1960);
BRAUNE,W., QUESTER,W. AN 286, 209 (1963);
AHNERT,P. MVS 1, 519 (1960);
DUEBALL,J., LEHMANN,P.B. AN 288, 167 (1965);
OBURKA,O. BAC 16, 213 (1965);
POHL,E. AN 289, 191 (1966);
BRAUNE,W., HUBSCHER,J. AN 290, 105 (1967);
ROBINSON,L.J. IBVS 114 (1965);
              IBVS 119 (1965);
              IBVS 180 (1967);
              IBVS 247 (1968).


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                                          W. QUESTER