COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS Number 1302 Konkoly Observatory Budapest 1977 July 8 NEW VARIABLE STARS IN THE FIELD OF gamma CYGNI The systematic photographic search of variable stars, in blue and infrared radiation, in 5 fields of some 25 square degrees each (Maffei 1975) has been continued in a field centered on the star gamma Cygni (alpha=20h20m26s; delta=40d05.7') with the Schmidt telescope of 65/90 cm of the Osservatorio Astrofisico of Asiago. From 4th Aug. 1967 to 7 Dec. 1974 some 74 I-N (hypers.) + RG5 and few 103a-O + GG 13 or without filter were collected. The examination of these plates leads to the discovery of 62 new variable stars, most of which visible in the infrared plates only. The plates were compared by means of the blink microscope of the Asiago Observatory. This operation was based on 13 pairs of selected plates. A few larger field with the same center was previously searched for variable stars in blue light by G.Romano, who was able to find 44 new variables (Romano 1969). The main characteristics of the 62 variables are listed in Table I. The numeration of the variables, characterized by the prefix M, continues the one started in the field of M 16-M 17 (Maffei 1975). The lack of some numbers is due to the exclusion of a few variables, not confirmed during the investigation following the discovery. The positions were obtained by means of the measuring machine Zeiss-PEK2 of the Specola Vaticana of Castelgandolfo. The identification charts, most of the curves of light and a detailed account, will be published, in a short time, in a more extensive work. Table I E Var. A.R.(1950.0) Dec. m_ir Type P 24..... N. M 210 20h27m16.1s 39d32'41" 12.1 15.4 M 770 40578 M 211 29 12.2 41 35 02 13.0 15.7 M 420 40062 M 212 21 11.0 41 07 19 14.7 15.7 SR 450: M 213 19 41.2 41 23 00 13.5 15.6 M 312: 40680 M 214 19 52.7 41 27 24 14.8 16.0 M 215 21 11.0 41 41 23 14.1 16.0 SR or M 400: 39844: M 216 23 41.0 42 16 37 11.1 14.5 M 382 39904 M 217 23 35.1 42 22 29 11.5 14.1 M 308 40380 M 218 21 54.5 42 40 57 14.4 15.6 SR or M 308:: 40096: M 219 20 47.4 42 39 54 11.3 14.2 RV 285 40056 M 220 18 20.5 42 53 23 13.0 14.2 SR 400:: 41060:: M 221 16 08.0 42 22 19 14.7 15.9 SR 280: 40480: M 222 16 50.8 41 58 46 13.4 15.6 M 383 41100 M 223 19 50.4 42 16 24 14.2 15.9 SR or M 484: 40580:: M 224 17 23.9 41 37 24 14.8 15.7 SR 290:: 41196:: M 225 13 51.5 42 12 43 15.0 15.8 SR M 226 27 51.9 38 55 59 15.0 15.7 M 228 23 33.3 38 32 44 12.0 14.8 M 462 39864 M 229 23 45.6 38 09 17 13.0 15.1 M 310 40500 M 230 21 13.4 38 54 34 13.3 15.4 M: 385: 40138 M 233 18 54.1 39 13 05 10.4 12.2 M 335 40560 M 234 20 30.1 40 33 33 10.1 14.4 M 268: 40815: M 235 16 42.1 40 24 41 12.5 15.0 M 442 40140 M 236 11 19.2 40 43 11 12.8 14.6 SR 416 40450 M 237 11 07.1 40 54 01 12.7 14.5 SR 410 40834 M 238 10 16.6 40 51 19 12.3 14.7 SR 318 40520 M 239 09 07.0 41 06 57 12.1 14.5 M 261 40818 M 240 08 46.6 41 13 47 12.6 14.4 M 300 40884: M 241 10 25.6 41 13 19 12.4 13.5 L:: M 242 10 34.5 41 16 20 12.5 13.4 I M 243 10 07.2 41 23 51 11.5 13.6 M 430 41160 M 244 10 08.9 41 27 02 12.5 13.4 E M 245 10 59.6 41 26 57 10.7 14.2 M 322 40504 M 246 10 36.0 41 42 45 11.9 13.7 M 251 39640 M 247 13 21.8 41 08 25 12.8 13.8 C:: M 248 14 49.4 41 25 48 13.6 14.8 SR or M 334: 40494 M 249 21 55.2 38 20 18 7.2 8.6 L:: M 251 19 29.7 38 53 19 14.4 15.3 M 252 16 49.7 39 08 22 9.3 11.3 M 395 40172 M 253 16 09.6 38 57 36 13.6 15.2 M 300 40104 M 254 17 15.1 38 45 10 14.4 15.6 M 256 17 24.9 38 21 32 13.2 15.2 M 565: 40570 M 257 13 50.6 38 16 23 8.7 11.4 M 400 41020 M 258 12 31.1 38 18 35 11.1 14.6 M 297 40474 M 259 13 32.9 39 49 32 12.4 15.5 M: 388 40176 M 260 13 10.2 39 47 00 13.2 14.8 E: M 261 12 00.6 40 13 10 13.1 14.8 M 290 40072 M 263 09 31.5 40 55 35 13.8 14.9 SR 460: 40280: M 264 09 33.9 40 43 28 12.4 13.8 M 415 39804: M 265 07 41.0 40 34 53 12.2 14.5 SR: M 266 05 47.6 40 34 59 10.4 14.3 M 350 40480 M 267 05 51.0 39 47 49 11.9 15.0 M 310 40150 Table I (cont.) Var. A.R.(1950.0) Dec. m ir Type p E N. 24..... M 268 20h07m55. 39 37 18 12.9 15.1 SR:: 400 M 269 07 01.4 39 04 04 13.4 14.2 L:: M 270 10 20.6 39 27 47 8.7 11.3 M 404 40365 M 271 11 36.1 39 17 52 12.7 15.4 M 412 42300 M 272 12 50.6 39 04 01 12.3 15.0 M 380 40798 M 273 10 46.4 38 53 27 12.4 15.1 M 400 39800 M 274 11 59.7 38 29 00 13.1 15.4 SR or M 584: 41198:: M 275 11 34.4 38 29 39 11.9 15.2 M 360 39980 M 276 11 37.7 38 25 24 12.4 14.4 E M 277 17 36.5 40 46 43 13.2 14.7 I Of the 62 new variables, 32 have been classified as Mira type stars, 11 as SR and 5 doubtful (SR or M). Before this research only 8 Mira and 13 SR were known in the field searched in blue light by Romano. This result confirms the strong increase of the number of Mira type stars when the observations are made by means of the infrared technique. However in the field of gamma Cygni this increase is not so dramatic as in the field of M 16 - M 17 previously reported. Many thanks are due to Fth. P. Treanor, Director of the Specola Vaticana and to Fth. E. De Graeve for the great help before and after the measurement. PAOLO MAFFEI Osservatorio Astrofisico Catania, Italia References: Maffei, P. 1975, Comm. 27 IAU.Inf.Bull.Var.Stars No. 985 Romano, G. 1969, Mem.Soc.Astron.Ital. 40, 375 [BIBCODE 1969MmSAI..40..375R ]