COMMISSIONS 27 AND 42 OF THE IAU INFORMATION BULLETIN ON VARIABLE STARS Number 3987 Konkoly Observatory Budapest 15 February 1994 HU ISSN 0374 - 0676 UBVR OBSERVATIONS OF THE DOUBLE-MODE CEPHEID TU Cas Recently one of us (Berdnikov, 1992) has decomposed available photoelectric observations of all double-mode Cepheids into two oscillations. It was pointed out as well that the number of the existing observations is not sufficient for certain investigation of light curve variations of the majority of these stars. Therefore we continue to carry out the observations of the all accessible double-mode Cepheids. Photoelectric observations of double-mode Cepheid TU Cas were carried out in summer- autumn 1993. The 60-cm reflector of the Mt. Maidanak observatory of the Tashkent Astronomical Institute was used and 99 UBVR measurements (Table 1) were obtained. Table 1 ------------------------------------------------------------------------------- JD hel V U-B B-V V-r JD hel V U-B B-V V-R 2440000+ 2440000+ ------------------------------------------------------------------------------- 9199.4587 7.824 .354 .668 .580 9211.4567 7.641 - .517 .492 9201.4275 7.681 .326 .559 .528 9212.3348 7.698 - .585 .533 9202.3738 7.970 - .692 .610 9212.4531 7.742 - .601 .545 9202.4582 7.982 .391 .695 .601 9218.3364 7.326 - .431 .408 9203.3170 7.294 .297 .396 .397 9219.2904 8.003 - .722 .628 9203.4053 7.407 .329 .460 .443 9219.3935 8.032 - .737 .622 9203.4635 7.470 .327 .479 .464 9219.4960 8.069 - .743 .635 9204.3068 8.029 .430 .731 .625 9220.2852 7.353 - .410 .411 9204.3917 8.050 .418 .734 .635 9220.4262 7.521 - .501 .476 9204.4688 8.059 - .739 .627 9221.3362 7.982 - .707 .615 9205.3160 7.492 .305 .473 .460 9221.4357 7.999 - .707 .619 9205.3994 7.560 .330 .506 .490 9221.4958 8.009 - .704 .620 9205.4651 7.610 .313 .542 .504 9222.2874 7.627 - .531 .482 9206.3392 7.915 - .676 .595 9222.4131 7.608 - .508 .494 9208.4036 7.934 - .673 .605 9222.4993 7.587 - .501 .494 9208.4685 7.941 - .690 .600 9224.2996 7.789 - .581 .529 9207.3247 7.659 - .531 .494 9224.4228 7.178 - .353 .361 9207.4061 7.540 .303 .479 .475 9225.2659 7.876 .383 .687 .591 9207.4692 7.459 - .450 .445 9225.4146 7.948 - .719 .610 9209.3728 7.195 - .361 .352 9225.4976 7.984 - .719 .620 9210.3410 7.933 .396 .698 .608 9226.2677 7.767 - .558 .532 9210.4273 7.955 - .710 .610 9226.4096 7.492 - .444 .440 9211.3143 7.756 - .574 .523 9226.4975 7.450 - .446 .437 ------------------------------------------------------------------------------- Table 1 (continued) ------------------------------------------------------------------------------- JD hel V U-B B-V V-R JD hel V U-B B-V V-R 2440000+ 2440000+ ------------------------------------------------------------------------------- 9227.2613 7.785 - .626 .564 9236.2306 7.996 - .726 .625 9227.4113 7.819 - .635 .568 9236.4180 8.025 - .727 .626 9227.5031 7.831 - .644 .586 9236.5038 8.044 - .737 .630 9228.2699 7.975 .400 .674 .607 9237.2246 7.515 - .469 .452 9228.4252 7.951 - .655 .586 9237.4086 7.574 - .510 .482 9228.5009 7.918 - .633 .577 9238.2822 7.823 - .640 .567 9229.2607 7.556 .318 .512 .498 9238.4102 7.869 - .646 .588 9229.4226 7.697 - .583 .547 9239.2181 7.912 - .645 .569 9229.5009 7.758 - .625 .561 9239.4039 7.554 - .483 .467 9230.2657 8.091 - .730 .630 9239.5115 7.232 - .374 .366 9230.4017 8.112 - .729 .630 9240.2295 7.806 - .643 .581 9230.4995 8.056 - .692 .613 9240.3416 7.881 - .689 .597 9231.2656 7.651 - .589 .516 9240.5125 7.967 - .721 .621 9231.4090 7.768 - .632 .561 9241.2317 7.933 - .647 .575 9231.4989 7.821 - .653 .571 9241.3623 7.478 - .450 .432 9232.2514 7.996 - .696 .608 9241.5133 7.278 - .379 .379 9232.4005 7.979 - .681 .600 9242.3301 7.877 - .668 .590 9232.4991 7.940 - .661 .582 9242.4162 7.892 - .687 .587 9233.2564 7.526 - .484 .475 9243.2117 7.937 - .656 .581 9233.4038 7.519 - .488 .473 9243.3614 7.880 - .631 .562 9234.2528 7.942 - .692 .605 9244.2354 7.525 - .516 .470 9234.4191 8.009 - .710 .618 9244.3904 7.632 - .559 .519 9234.4986 8.043 - .702 .627 9244.5094 7.703 - .606 .531 9235.2473 7.165 - .352 .339 9245.2323 8.052 - .730 .621 9235.4187 7.423 - .466 .443 9245.3672 8.072 - .729 .619 9235.5030 7.518 - .508 .483 9298.1402 7.924 - .695 .600 9298.2965 8.095 - .626 .710 ---------------------------------------------------------------------------- The authors wish to express their thanks to Dr. V.S. Shevchenko for allocation of observing time. L. BERDNIKOV M. IBRAGIMOV Sternberg Astronomical Institute, Astronomical Institute, Tashkent, Moscow, Russia Republic of Uzbekistan University of Saratov, Saratov, Russia Reference: Berdnikov L.N., 1992, Pis`ma Astron. Zh., 18, 654 [BIBCODE 1992SvAL...18..259B ]