COMMISSION 27 OF THE I.A.U. INFORMATION BULLETIN ON VARIABLE STARS Number 2915 Konkoly Observatory Budapest 10 July 1986 HU ISSN 0374 - 0676 B, V OBSERVATIONS OF RED STARS IN THE NEIGHBOURHOOD OF OPEN CLUSTERS During 1979-1983 the group of stars of late spectral classes in the neighbourhood of open clusters was observed photoelectrically with the 20-inch reflector of Ural University Observatory. Variability of M4 star signed P by Barkhatova and Vasilevsky (1967) in NGC 6819 (C 1940+4004) was confirmed. The amplitude was found equal to 0.32m for V and 0.29m for B colour. Stars in NGC 129 (C 0027+5957) signed No. 2 and No. 3 by Hoag et al. (1961) and Arp et al. (1959) and in NGC 1664 (C 0448+4337) No. 3 by Hoag et al. (1961) were suspected in B variability. Root mean square errors for a single observation are equal to +-0.010m, +-0.013m for V, B colour bands. Results of observations are given in Tables I - III. First column contains the heliocentric times JD of observations and instrumental differences B and V estimations are in the next columns. The photometric system is close to that of Johnson, Morgan (see Kozhevnikov et al., 1984). Table I Photometry of NGC 6819 JD DeltaV_P-0 DeltaB_P-0 JD DeltaV_Q-0 DeltaB_Q-0 2444... 2444... 172.2654 -0.029 0.372 172.2612 0.170 -0.740 .2738 -0.020 0.390 .2891 0.145 -0.741 .2848 -0.029 0.395 186.1459 -0.008 0.426 186.1409 0.166 -0.803 .1541 0.010 0.424 .1819 0.170 -0.751 .1625 0.011 0.441 290.4954 -0.004 0.415 290.4904 0.133 -0.687 .5043 0.080 0.414 .5322 -0.078 0.425 379.3002 0.096 0.493 379.2967 0.105 -0.771 .3065 0.106 0.575 .3169 0.158 -0.754 .3141 0.080 0.502 497.2990 0.277 0.660 497.2941 0.182 -0.730 .3073 0.288 0.675 .3115 0.194 -0.739 .3157 0.275 0.676 837.3379 0.088 0.496 837.3343 0.159 -0.760 .3447 0.098 0.478 .3482 0.170 -0.774 838.2498 0.099 0.493 838.2456 0.181 -0.749 .2568 0.100 0.478 .2601 0.190 -0.749 .2636 0.102 0.482 840.2388 0.085 0.489 840.2353 0.171 -0.749 .2458 0.076 0.465 .2549 0.172 -0.752 .2514 0.074 0.490 841.2869 0.068 0.453 841.2819 0.172 -0.725 .2945 0.061 0.411 .2980 0.182 -0.743 .3022 0.052 0.432 842.3715 0.053 0.442 842.3680 0.190 -0.708 .3798 0.025 0.449 .3840 0.192 -0.686 .3875 0.050 0.465 843.3672 0.074 0.485 843.3512 0.288 -0.600 .3797 0.044 0.476 .3957 0.142 -0.748 .3901 0.047 0.469 2445.. 2445... 183.3846 0.147 0.580 183.3794 0.187 -0.728 .3959 0.158 0.570 .4118 0.194 -0.709 .4068 0.164 0.573 208.4123 0.264 0.633 208.4061 0.037 -0.812 .4241 0.124 0.552 .4412 0.090 -0.829 .4355 0.172 0.642 223.1992 -0.032 0.394 223.1970 0.186 -0.788 .2025 -0.034 0.383 .2080 0.170 -0.775 .2065 -0.037 0.401 Note.- P is the variable star, 0 - comparison star, Q - check star, (See Barkhatova and Vasilevsky, 1967) Table II Photometry of NGC 129 JD DeltaV_2-5 DeltaB_2-5 DeltaV_3-5 DeltaB_3-5 DeltaV_7-5 DeltaB_7-5 2444... 172.3238 -0.300 0.625 .3293 -0.115 0.693 .3389 -0.298 0.626 .3431 -0.115 0.702 186.2163 0.415 -0.058 .2218 -0.261 0.687 .2259 -0.138 0.628 .2351 -0.273 0.663 .2391 -0.133 0.633 .2483 -0.276 0.664 .2524 -0.144 0.635 .2566 0.429 -0.051 263.1259 0.416 -0.083 .1372 -0.152 0.637 .1518 -0.294 0.714 .1560 -0.132 0.709 .1651 -0.301 0.686 .1692 -0.134 0.675 .1755 0.405 -0.092 264.1213 0.465 -0.030 .1269 -0.267 0.704 .1304 -0.124 0.695 .1379 -0.271 0.680 .1421 -0.146 0.667 .1498 -0.283 0.660 .1532 -0.136 0.659 .1617 -0.314 0.646 .1651 -0.155 0.647 .1685 0.449 -0.020 276.1947 0.438 -0.028 .2017 -0.282 0.645 .2059 -0.146 0.621 .2156 -0.303 0.612 .2196 -0.161 0.588 .2245 0.384 -0.091 277.1282 0.412 -0.074 .1326 -0.279 0.653 .1371 -0.124 0.638 .1458 -0.274 0.674 .1504 -0.146 0.630 .1597 -0.280 0.649 .1639 -0.155 0.605 .1687 0.403 -0.061 290.2238 0.413 0.015 .2288 -0.284 0.685 .2335 -0.136 0.645 .2447 -0.253 0.658 .2524 -0.122 0.640 .2620 -0.265 0.645 .2670 -0.118 0.638 .2718 0.430 -0.041 497.3669 0.432 -0.044 .3711 -0.284 0.639 .3745 -0.126 0.641 .3850 -0.278 0.644 .3892 -0.144 0.832 .3981 0.283 0.637 .4023 -0.129 0.646 .4066 0.419 -0.046 678.4114 0.410 -0.038 .4156 -0.142 0.601 .4191 -0.276 0.612 .4378 -0.144 0.590 .4414 -0.286 0.606 .4497 -0.133 0.586 .4539 -0.286 0.592 .4580 0.413 -0.042 837.3831 -0.291 0.748 .3864 -0.184 0.589 .3942 -0.303 0.627 .3968 -0.187 0.579 838.3380 0.420 -0.042 .3512 -0.283 0.627 .3539 -0.161 0.580 .3601 -0.285 0.652 .3630 -0.108 0.644 .3730 -0.335 0.585 .3733 -0.197 0.544 .3769 0.606 -0.018 840.3249 0.385 -0.096 .3284 -0.290 0.612 .3326 -0.175 0.598 .3387 -0.270 0.687 .3470 -0.162 0.593 .3540 -0.259 0.670 .3561 -0.164 0.599 .3597 0.445 -0.029 841.3264 0.402 -0.057 .3306 -0.282 0.620 .3339 -0.148 0.598 .3430 -0.286 0.625 .3464 -0.155 0.595 .3548 -0.292 0.630 .3577 -0.148 0.601 .3618 0.425 -0.050 2445.. 318.1791 0.444 -0.020 .1875 -0.284 0.645 .2074 -0.280 0.662 .2147 -0.138 0.642 .2269 -0.273 0.666 .2321 -0.132 0.658 .2378 0.421 -0.049 - Variable stars are No. 2, No. 3, the comparison star is No. 5, check star is No. 7. (See Hoag et al., 1961) Table III Photometry of NGC 1664 JD DeltaV_3-4 DeltaB_3-4 JD DeltaV_1-4 DeltaB_1-4 2444... 2444... 276.2603 -0.004 1.557 276.2493 -1.314 -1.446 .2930 -0.000 1.562 .3118 -1.345 -1.484 .3076 -0.008 1.546 277.2119 0.008 1.562 277.1987 -1.346 -1.508 .2271 0.001 1.536 .2522 -1.387 -1.559 .2452 -0.022 1.511 290.3580 -0.020 1.502 290.3489 -1.372 -1.532 .3760 0.000 1.508 .3940 -1.355 -1.518 .3900 -0.000 1.510 304.2215 0.005 1.533 304.2133 -1.347 -1.544 .2333 0.009 1.563 .2452 0.035 1.528 313.2894 -0.050 1.456 313.2823 -1.364 -1.518 .2997 -0.058 1.451 .3130 -1.379 -1.546 .3088 -0.035 1.439 678.3421 -0.001 1.495 678.3331 -1.359 -1.514 .3609 0.024 1.499 .3775 -1.358 -1.516 .3741 -0.003 1.457 841.3943 -0.053 1.411 841.3867 -1.363 -1.520 .4083 -0.069 1.407 .4248 -1.365 -1.507 .4201 -0.062 1.422 2445... 2445... 403.3630 0.018 1.410 403.3500 -1.341 -1.513 .3825 0.006 1.491 .3879 -1.363 -1.535 426.2809 -0.024 1.433 426.2776 -1.332 -1.510 .2853 0.012 1.474 .2910 -1.316 -1.606 .2898 -0.045 1.428 Note.- Star No. 3 is the variable star, No. 4 - comparison star, No. 1- check star (See Hoag et al., 1961). ZAKHAROVA P. E., KOZHEVNIKOV V. P., POLUSHINA T. S., ERMAKOVA T. P. Urals University Observatory 620083 Sverdlovsk, USSR References: Arp H., Sandage A., Stephens C., 1959, The Astrophys. J., 130, 1, 80. [BIBCODE 1959ApJ...130...80A ] Barkhatova K., Vasilevsky A. E., 1967, Peremennye Zvezdy, Sow., Moscow, 16, 2(122), 191. [BIBCODE 1967PZ.....16..191B ] Hoag A. A. et al, 1961, Publ. US Naval Obs. Sec. ser., 1961, 17, 7. [BIBCODE 1961PUSNO..17..343H ] Kozhevnikov V. P., Orekhova L. K., Polushina T. S., 1984, Metody astronomo- geodezicheskikh issledovanij, Sow., 140, Sverdlovsk. [BIBCODE 1984magi.conf..140K ]