COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS Number 1819 Konkoly Observatory Budapest 1980 July 21 V AND B - V MAGNITUDES OF BRIGHT CEPHEIDS FROM ELECTROSPEC- TROPHOTOMETRIC OBSERVATIONS At the high-altitude station "Terskol" (Main Astronomical Observatory of the Ukrainian Academy of Sicences) over the period 1974-1978 a number of variables were observed with a Seya-Namioka scanner. Scannograms were treated by the relative electrospectrophotometry method (1) with use of eleven standards of the Odessa spectrophotometry system OAO -77 (2), (3) as the comparison stars. The system is based on the calibration of alpha Lyr, by Heyes and Hatham (4). Energy distribution in the radiation spectra of classical cepheids delta Cep, zeta Gem and eta Aql have been obtained in the range 3200-7700 Angstrom with a step of 50 Angs. in absolute units. The V and B-V magnitudes were calculated using the curves of the UBV correction of the Johnson system by Straizys (5). Light variation phases were obtained from the second edition to GCVS (6) and from Scarfe (8) for zeta Gem. The moments of observations to the solar centre are not given. The V and B-V magnitudes are in good agreement with the mean curves (Nikolov,7) for delta Cep and eta Aql and with the data by Scarfe (or Eggen) for zeta Gem. A significant scattering of points was observed on the curves of the B-V and eta Aql in the area of the descending branch. The curves of V and B-V of zeta Gem satisfy better Scarfe's elements than those of GCVS. The observational results are given in Tables I-III. E.A. DEPENCHUK Odessa Department of Main Astronomical Observatory of the Ukrainian Academy of Sciences Table I delta Cep J.D, 244... phi V B-V 2 2334.341 0.324 4m055 0m800 2 2506.561 0.477 4.115 0.828 3 2507.567 0.603 4.288 0.893 4 3722.520 0.007 3.490 0.490 5 3725.416 0.547 4.220 0.895 6 3791.365 0.836 4.168 0.808 7 3792.314 0.013 3.509 0.462 8 3797.313 0.944 3.600 0.528 9 3814.356 0.120 3.718 0.594 Table II zeta Gem J.D. 244... phi V B-V phi_Sc 1 1997.545 0.828 3m790 0m692 0.847 2 2108.438 0.752 3.848 0.796 0.771 3 2112.354 0.138 3.789 0.778 0.157 4 2113.362 0.237 3.887 0.839 0.257 5 2437.331 0.151 3.814 0.797 0.173 6 2443.361 0.748 3.865 0.760 0.768 7 2445.421 0.950 3.697 0.713 0.970 8 2476.330 0.995 3.624 0.655 0.016 9 2479.332 0.291 3.944 0.861 0.311 10 2481.331 0.487 4.124 0.927 0.508 11 2776.494 0.565 4.081 0.966 0.588 12 2778.526 0.765 3.861 0.724 0.787 13 2779.496 0.861 3.712 0.701 0.883 14 3791.571 0.565 4.107 0.954 0.592 15 3792.575 0.664 3.994 0.851 0.691 16 3795.572 0.959 3.664 0.706 0.986 17 3797.580 0.157 3.781 0.811 0.184 18 3813.462 0.720 3.867 0.785 0.749 19 3839.597 0.296 3.923 0.873 0.324 20 3840.604 0.395 4.125 0.950 0.423 Table III eta Aql J.D. 244... phi V B-V 1 1847.439 0.992 3m515 0m639 2 1868.496 0.926 3.736 0.728 3 1900.383 0.369 3.900 0.911 4 1905.389 0.206 3.768 0.800 5 1907.327 0.337 3.849 0.832 6 1935.385 0.246 3.798 0.855 7 2139.564 0.697 4.368 1.046 8 2141.553 0.974 3.523 0.644 9 2150.551 0.228 3.836 0.865 10 2166.460 0.444 4.148 1.023 11 2168.522 0.732 4.291 1.017 Table III (cont.) J.D. 244... phi V B-V 12 2175.516 0.707 4.331 1.059 13 2327.200 0.842 4.016 0.874 14 2329.188 0.119 3.694 0.794 15 2330.270 0.270 3.859 0.844 16 2331.214 0.401 3.984 0.921 17 2332.267 0.548 4.247 1.017 18 2333.233 0.683 4.348 1.053 19 2760.124 0.165 3.735 0.793 20 3242.567 0.390 4.001 0.945 21 3243.552 0.527 4.201 0.982 22 3244.550 0.666 4.324 1.085 23 3245.543 0.805 4.148 0.939 24 3274.518 0.842 3.994 0.865 25 3275.509 0.980 3.485 0.695 26 3280.482 0.673 4.348 1.037 27 3291.470 0.204 3.860 0.876 References: 1. Komarov, et al. -Astrometrija i Astrofiz.,Kiev,24, 65, 1974 [BIBCODE 1974AAfz...24...65K ] 2. Komarov, Korotkikh - Astron.Zh.,55, No. 5, 1011, 1978 [BIBCODE 1978AZh....55.1011K ] 3. Komarov, et al. - Astron.Zh., 55, No.6, 1208, 1978 [BIBCODE 1978AZh....55.1208K ] 4. Hayes, Latham - Astrophys.J.,197, No.3, 593, 1975 [BIBCODE 1975ApJ...197..593H ] 5. Straizys - Multicolor Stellar Photometry, Vilnus, 1977 6. Kukarkin et al.,- The second supplement to the third edition of GCVS, 1974 [BIBCODE 1974sstt.book.....K ] 7. Scarfe - Astrophys.J., 209, No.1, 141, 1976 [BIBCODE 1976ApJ...209..141S ] 8. Nikolov - Catalogue of the light and color curves of Cepheids in the UBV system, Sofia 1968