COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                     Number 1713

                                Konkoly Observatory
                                Budapest
                                1979 December 7


              RY INDI: LIGHT ELEMENTS


RY Indi (CoD-46d13772, CPD-46d10113) has been observed in the UBV system at
the Bosque Alegre Station of Cordoba Observatory; 72 and 146 observations were
obtained by one of us (JC) in 1973 and 1979. The observations of the two runs
are shifted by 0.1906d when the phases are computed with Hoffmeister's
elements (KVBB, 27, 1943) as given in the GCVS (1968). Therefore these
elements should be improved.

From a mean light curve in each colour four times of minimum light were
derived; the mean values are given in Table I; errors were computed from the
individual minima in each pass-band. Also in Table I the epoch of
Hoffmeister's light elements is listed.

Table I

Minima of RY Indi

JD Hel.        E          O-C      Remarks
2400000+
27993.574     -21101.0   -0.0007    1
41900.8057     -1571.5   +0.0006    2
41901.1653     -1571.0   +0.0042    2
44139.6880     +1572.5   -0.0035    2
44140.0469     +1573.0   -0.0006    2

(1) Hoffmeister, KVBB, 27, 1943
(2) Present observations.

A least squares linear solution yields:

Min.I = Hel.J.D. 2443019.8922 +0.71211400d*E
                      +-.0016 +-.00000017 m.e.

which gives an up today ephemeris with an improved period.

The light curves show the general characteristics of an EB variable. The
observations were made differentially in relation to HD 199264(F0), whose
colour indices are almost the same of the variable star and its apparent
position is very close to it. The UBV values of the comparison star are:
V=9.066, B-V=0.327, and U-B=0.097, while the variable displays:

Maximum: V=10.826, B-V=0.277, and U-B=0.097
Min. I.: V=11.446, B-V=0.301, and U-B=0.115
Min.II.: V=11.040, B-V=0.258, and U-B=0.092.

The location of the variable at maximum light in the colour- colour diagram is
consistent with the spectral type A8 slightly reddened by E(B-V)=0.05 and
E(U-B)=0.04; similar values, E(B-V)= 0.07 and E(U-B)=0.05 were found for the
comparison star (F0). The colours of RY Indi at primary minimum are somewhat
later (A9) than at maximum light.


J.J. CLARIA
R.F. SISTERO
Observatorio Astronomico
Laprida 854
5000 Cordoba, Argentina