COMMISSIONS 27 AND 42 OF THE IAU INFORMATION BULLETIN ON VARIABLE STARS Number 3784 Konkoly Observatory Budapest 5 October 1992 HU ISSN 0374 - 0676 PHOTOELECTRIC UBV OBSERVATIONS OF THE s-CEPHEID V1334 Cyg V 1334 Cyg, a small amplitude Cepheid has been known as a spectroscopic binary. The close companion to V1334 Cyg is a B-type star (B4 V according to Usenko's (1990) photometry; B8 III from IUE spectra (Henriksson, 1982) and B5-B8 V from TD1 spectra (Parsons, 1981)), with more reliable value of the orbital period about 1240d (Szabados, 1991). Photoelectric observations of V1334 Cyg have been performed in October 1988 at Abastumany Astrophysical Observatory (Georgian Academy of Sciences). Observations were made in the UBV filters with the 48-cm reflector AZT-14. HR 8169 (V=6.056 U-V=0.199; B-V=0.063 (Arellano Ferro, 1984)) was used as the comparison star. The V, U-V and B-V data are listed in Table 1 together with the phases calculated with the elements according to Arellano Ferro (1984): Epoch+Phase=(HJD-2444863.767)/3.33279d The uncertainties are 0.010m, 0.020m, and 0.010m in V, U-V and B-V respectively. The light and colour curves of V1334 Cyg are plotted in Figure 1. The new data are denoted with dots. For comparison purposes data obtained by Millis (1969) (squares), Szabados (1977) (crosses), Arellano Ferro (1984) (triangles) are also shown. For all these data the phases have been computed from Arellano Ferro (1984) too. The colour curves U-V and B-V from various authors differ from each other completely, this is especially noticeable for the recent B-V data. Moreover, the scattering of the data supposes some amplitude variations for this interesting s-Cepheid. Table 1 Photoelectric observations of V 1334 Cyg HJD 2440000.+ V U-V B-V Phase 7436.2766 5.834 0.625 0.340 0.879 7436.2839 5.845 0.609 0.303 0.881 7436.3111 5.841 0.638 0.316 0.889 7436.3146 5.853 0.632 0.325 0.890 7436.3330 5.858 0.624 0.279 0.895 7436.3476 5.863 0.836 0.244 0.900 7436.3587 5.864 0.614 0.310 0.903 7436.3630 5.852 0.617 0.313 0.905 7436.3969 5.815 0.651 0.360 0.915 7436.4625 5.831 0.630 0.300 0.935 7436.4634 5.843 0.616 0.288 0.938 7436.4106 5.855 0.602 0.301 0.937 7436.5098 5.857 0.597 0.319 0.942 7441.4009 5.913 0.858 0.315 0.416 7441.4578 5.907 0.679 0.332 0.433 7441.4705 5.905 0.672 0.330 0.437 7444.2258 5.988 0.652 0.369 0.264 7445.2314 5.948 0.650: 0.320: 0.566 7450.3086 5.908 0.644 0.327 0.089 7450.3161 5.908 0.823 0.331 0.091 7450.3305 5.903 0.628 0.315 0.098 7450.3379 5.910 0.631 0.911 0.098 7450.3492 5.903 0.652 0.312 0.101 7450.3578 5.902 0.642 0.331 0.104 7450.3655 5.905 0.591 0.332 0.106 7451.2482 5.998 0.669 0.365 0.371 7451.2544 6.003 0.671 0.355 0.373 7452.3198 5.939 0.838 0.322 8.698 7452.3841 5.935 0.622 0.308 0.708 7452.3712 5.928 0.644 0.342 0.708 [FIGURE 1] Figure 1. Light and colour variations of V1334 Cyg during October 1988, (see the comments in the text) IGOR A. USENKO Department of Astronomy, Odessa State University Shevchenko Park, 270014, Odessa Ukraine References: Arellano Ferro, A., 1984, M. N. A. R. S., 209, 481 [BIBCODE 1984MNRAS.209..481A ] Henriksson, G., 1982, Rep. Obs. Lund., No. 18, 89 Millis, R. L., 1969, Lowell Obs. Bull., No. 148 Parsons, S. B., 1981, Astroph. J., 247, 560 [BIBCODE 1981ApJ...247..560P ] Szabados, L., 1977, Mitt. Sternw. Ung. Akad. Wiss., Budapest, No. 70, 63 [BIBCODE 1977CoKon..70....1S ] Szabados, L., 1991, ibid, No. 96, 175 [BIBCODE 1991CoKon..96..123S ] [CoKon No. 96] Usenko, I. A., Kinematika i Fizika Nebesn. Tel, 6, No. 3, 91 [BIBCODE 1990KFNT....6...91U ]