COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                     Number 2009

                                Konkoly Observatory
                                Budapest
                                1981 August 28

                                HU ISSN 0374-0676



                   V 1334 Cyg


   The Cepheid HR 8157 = V 1334 Cyg, discovered by Millis (1969),
was observed photoelectrically on the nights October 10, 13 and
20, 1980 with the UBV photometer described by Piccioni (1972)
mounted on the 60 cm telescope of the Bologna Observatory.
   Tau Cygni and Sigma Cygni were used as comparison stars, data
about these stars are reported in Table I. Tau Cygni is variable
but its range (0.02m) is much smaller than V 1334 Cygni's (0.20m)
(Pande 1960, Pant et al. 1968, Millis 1968, Bartolini and 
Dapergolas 1980).

                                   Table I
-----------------------------------------------------------------------------
Star        Sp       V             B-V     U-B           Source
-----------------------------------------------------------------------------
Sigma Cyg   B9 Iab   4.23          .13    -.39           Iriarte et al.(1965)
Tau Cyg     F0 IV    3.71          .41     .02           This paper

        The mean UBV magnitudes of V 1334 Cygni are reported in Table
II.


                                   Table 
               -----------------------------------------------------
               J.D.-2444000   N    Phase          V      B-V     U-B
               -----------------------------------------------------
                     523.38   11   .859          5.810   .476   .175
                        .46    6   .882          5.804   .476   .166
                     526.33    8   .744          5.873   .496   .165
                        .36   11   .753          5.865   .489   .173
                        .43   12   .774          5.856   .489   .175
                     534.30   16   .135          5.822   .489   .178
                        .38   13   .159          5.830   .490   .177
                        .44   10   .177          5.834   .491   .176


   Standard error of the mean is about 0.005m, but in addition
systematic calibration errors of 0.03m could arise from the 
transformation into the UBV system.
   By comparing the present observations with Millis' observations, 
we determined the time of maximum of light: JD 2444523.85+-
0.08d. Taking into account all the times of maximum (Table III)
we conclude that the period is constant. The residuals have been


                    Table III

J.D.Obs.Max.      E   O-C    Source
-----------------------------------------------
2440124.533       0   .00    Millis (1969)
2441760.90      491  -.05    Szabados (1977)
2443700.63     1073  -.01    Percy et al.(1979)
2444523.85     1320   .00    this paper

computed with the formula:

     Hel. J.D. Max. - 2440124.533 + 3.332816d*E

in excellent agreement with the values published by Henden (1979).




                         C. BARTOLINI
                         A. DAPERGOLAS
                         A. PICCIONI
                 Istituto di Astronomia dell' Universita
                 di Bologna, via Zamboni 33
                      40126 Bologna, Italy



References:

Bartolini, C., Dapergolas, A. 1980, I.B.V.S., No. 1884.
Henden, A.A., 1979, Mon. Not. R. astr. Soc., 189, 149. [BIBCODE 1979MNRAS.189..149H ]
Iriarte, B., Johnson, H.L., Mitchell, R.I., Wisniewski, W.K.,
     1965, Sky and Telescope, 30, 21. [BIBCODE 1965S&T....30...21I ]
Millis, L.R., 1969, Lowell Obs. Bull., 7, 113. [BIBCODE 1969LowOB...7..113M ]
Pande, M.C. 1960, Observatory, 80, 225. [BIBCODE 1960Obs....80..225P ]
Pant, M.M., Gaur, V.P., Pande, M.C., 1968, Observatory, 88, 221. [BIBCODE 1968Obs....88..221P ]
Percy, J.R., Baskerville, I., Trevorrow, D.W., 1979, Publ. astr.
     Soc. Pac., 91, 368. [BIBCODE 1979PASP...91..368P ]
Piccioni, A., 1972, Mem. Soc. astr. It., 43, 159. [BIBCODE 1972MmSAI..43..159P ]
Szabados, L., 1977, Mitt. Sternw. ung. Akad. Wiss., Nr. 70, Budapest [BIBCODE 1977CoKon..70....1S ]
							[CoKon No. 70]