COMMISSIONS 27 AND 42 OF THE IAU INFORMATION BULLETIN ON VARIABLE STARS Number 4021 Konkoly Observatory Budapest 5 May 1994 HU ISSN 0374 - 0676 POSITIONS OF VARIABLE STARS IN PLAUT'S FIELD 2 This paper continues the study announced in our previous publication (Antipin et al., 1994) and deals with the variable stars in the Palomar-Groningen Field 2 (Plaut,1968). 924 variables were discovered by Plaut in the field, 46 of them being rediscoveries. We have compared the finding charts for all of them with corresponding fields of the HST Guide Star Catalog. 67 stars have been identified with the GSC, the results are presented in Table 1. Remarks to the Table are given for stars with the symbol "R" in the last column. Table 1 contains also GSC identifications for 5 GCVS or NSV stars in the field discovered not by Plaut; these stars are indicated by asterisks in the last column. For those stars not present in the GSC, we have checked the agreement of their positions in the finding charts with co-ordinates published by Plaut. In most cases the agreement is very good. Noticeable discrepancies have been found only in 8 cases presented in Table 2. Table 1 No. GCVS alpha_2000 delta_2000 GSC Remark Plaut NSV h m s d ' " 4 V1128 Oph 16 56 51.6 -20 06 42 6227-2446 6 V1133 Oph 16 56 59.3 -17 53 15 6223-1364 9 V1135 Oph 16 57 03.6 -18 29 21 6223-1724 21 V1145 Oph 16 57 40.0 -21 19 40 6231-2187 30 V1154 Oph 16 58 23.0 -20 01 47 6227-1599 32 V1157 Oph 16 58 28.9 -17 29 47 6223-0235 33 V1158 Oph 16 58 33.3 -18 38 02 6223-1616 44 V1169 Oph 16 59 08.8 -18 40 54 6223-1043 45 V1171 Oph 16 59 15.6 -18 12 44 6223-1299 53 V1182 Oph 16 59 25.5 -16 30 41 6219-0888 R 59 NSV 8086 16 59 38.3 -19 56 50 6227-2832 62 V1187 Oph 17 00 01.6 -20 56 49 6231-0216 66 V1190 Oph 17 00 06.4 -21 00 28 6231-1254 NSV 8094 17 00 07.1 -18 04 56 6223-0374 * 67 V1191 Oph 17 00 10.0 -21 01 09 6231-0033 75 V1199 Oph 17 00 29.6 -20 30 50 6227-0263 R 79 V1206 Oph 17 00 34.5 -17 10 18 6223-1315 80 V1203 Oph 17 00 40.3 -21 21 20 6231-2425 102 V1227 Oph 17 01 22.8 -17 09 36 6223-1009 120 V1245 Oph 17 02 06.4 -18 52 51 6227-1006 151 V1275 Oph 17 03 01.2 -19 10 37 6227-1510 154 V1277 Oph 17 03 16.7 -21 18 53 6231-2410 158 V1281 Oph 17 03 26.1 -21 48 19 6231-2432 177 V1301 Oph 17 04 16.4 -18 46 27 6240-0817 190 V1316 Oph 17 04 42.7 -16 59 58 6236-0400 201 NSV 8166 17 05 05.0 -22 01 08 6244-0021 230 V1353 Oph 17 06 00.6 -21 57 41 6244-0168 248 V1373 Oph 17 06 31.6 -18 05 19 6236-0370 258 V1381 Oph 17 06 42.6 -16 52 11 6232-1017 269 V1392 Oph 17 07 05.5 -20 35 14 6240-0819 298 V1421 Oph 17 07 56.5 -18 48 40 6240-0862 305 V1427 Oph 17 08 07.8 -20 57 06 6244-0134 R 306 V1428 Oph 17 08 12.6 -22 16 55 6244-0024 R 331 V1451 Oph 17 08 57.1 -21 37 14 6244-0578 344 V1468 Oph 17 09 14.7 -17 37 46 6236-1084 359 V1481 Oph 17 09 37.5 -20 01 01 6240-0551 383 V1503 Oph 17 10 15.0 -19 06 07 6240-0743 401 V1524 Oph 17 10 38.2 -17 17 27 6236-0303 415 NSV 8261 17 11 02.4 -16 56 37 6236-0320 423 V1543 Oph 17 11 18.0 -16 56 52 6236-1140 R 442 V1559 Oph 17 11 52.6 -19 16 12 6240-0349 461 V1577 Oph 17 12 12.9 -20 01 28 6241-0757 485 V1602 Oph 17 12 41.7 -17 38 15 6237-0491 507 V1623 Oph 17 13 09.0 -18 21 08 6237-0425 R 509 V1625 Oph 17 13 20.2 -19 14 27 6241-0841 520 V1637 Oph 17 13 35.1 -18 05 50 6237-2975 525 V1645 Oph 17 13 41.3 -16 35 55 6233-0832 R 543 V1658 Oph 17 14 11.8 -20 55 02 6245-0363 V448 Oph 17 15 20.8 -18 07 02 6237-1702 *R 587 V1699 Oph 17 15 23.0 -21 26 18 6245-0456 616 V1733 Oph 17 16 13.2 -17 19 41 6237-2794 R 652 V1764 Oph 17 16 57.8 -17 18 14 6237-2842 662 V1774 Oph 17 17 16.3 -17 30 44 6237-0492 677 V2071 Oph 17 17 31.9 -17 52 54 6237-1380 688 AE Oph 17 17 52.6 -20 01 19 6241-0297 NSV 8465 17 17 58.9 -18 06 04 6237-1123 * 705 V1814 Oph 17 18 06.3 -16 58 40 6237-0935 703 V1810 Oph 17 18 06.4 -18 54 06 6241-0378 NSV 8472 17 18 10.0 -17 15 48 6237-0573 * 718 V1828 Oph 17 18 33.0 -16 45 05 6233-0932 724 NSV 8486 17 18 44.6 -18 56 15 6241-0062 769 V1872 Oph 17 19 51.4 -18 49 33 6241-0286 773 V742 Oph 17 19 56.5 -18 54 11 6241-0885 778 V1878 Oph 17 20 02.7 -21 35 24 6246-0162 815 V441 Oph 17 20 52.8 -17 20 05 6238-1066 NSV 8540 17 20 55.0 -21 29 20 6246-0428 * 830 V1930 Oph 17 21 14.1 -16 27 50 6234-0986 851 V1950 Oph 17 21 39.9 -18 56 57 6242-0035 R 872 V1972 Oph 17 22 15.0 -18 21 06 6238-0396 873 V1970 Oph 17 22 23.7 -22 30 56 6825-0189 878 V1978 Oph 17 22 30.1 -17 34 31 6238-2620 898 V1999 Oph 17 22 56.1 -17 14 05 6238-1136 Remarks. V1182 Oph. Double; the GSC star is the red, brighter, following component that presumably varies. V1199 Oph. Double; the GSC star is the redder, brighter, preceding component that presumably varies. V1427 Oph. Close double. The finding chart presumably shows the northwestern component to be variable; the southeastern component seems redder on Palomar prints. It is not clear which of the components is present in the GSC. V1428 Oph. Possibly multiple. The GSC star is, most probably, the brightest and the reddest component which varies. V1543 Oph. Multiple; the brightest component enters the GSC. V1623 Oph. Double; the brighter component enters the GSC. V1645 Oph. Double; the northwestern component marked by Plaut as variable. We are not sure which component is in GSC, but maybe the southeastern one. V448 Oph (SVS 431). The finding chart (Shajn, 1934) is rather bad, and the published position is wrong by 1d in declination. Our identification with GSC refers to a star actually found by us to be variable on Moscow plates. The mistake in the published position was originally communicated to us by A. Paschke (Zurich), but he apparently identified the variable with another GSC star. V1733 Oph. Double; the redder, northwestern component varies. We are not sure which component is in GSC. V1950 Oph. Close double; Plaut marked the preceding, slightly redder component as variable. We are not sure which component is in GSC. Table 2 No. GCVS alpha_2000 delta_2000 h m s d ' " 5 V1129 Oph 16 56 47.0 -18 25 56 98 V1224 Oph 17 01 14.9 -16 23 06 429 V1548 Oph 484 V1596 Oph 17 12 46 -21 48.2 497 V1611 Oph 17 12 59.3 -19 00 57 574 V1689 Oph 17 14 51.0 -16 19 24 732 V1839 Oph 17 18 54.0 -21 01 23 881 V1979 Oph 17 22 36.7 -20 51 54 The co-ordinates for six of them have been measured by us relative to neighboring GSC stars. There was a misprint by 1d in the declination of No. 484 = V1596 Oph in Plaut (1968); the l and b values given by Plaut for this star correspond to the correct declination. It is very difficult to explain the great difference (about 4d) between the co-ordinates measured by us and published by Plaut for the Mira variable No. 732 = V1839 Oph. The variable star is clearly marked in the chart, with comparison stars indicated. We tend to adopt our co-ordinates for this star. No confusion with other designated variables occurred in any of these cases as a result of changed co-ordinates. The finding chart for No. 429 = V1548 Oph shows the star identical with No. 408 = V1528 Oph, though their published co-ordinates differ considerably (the co-ordinates published for V1528 Oph agree with the position in the chart). V1528 Oph is a Mira variable, and V1548 Oph is a doubtful Nova discovered on two plate pairs, on both of which V1528 Oph was also discovered. So the two stars are, most probably, really different. The finding chart for V1548 Oph does not show comparison stars, while that for V1528 Oph shows them. We conclude that we have no reliable finding chart for V 1548 Oph and cannot improve its position. Finally, several notes on three more variables in the field. We have not been able to identify finding charts for NSV 8077 (Shajn,1934) and NSV 8305 (Strohmeier et al.,1966) with star fields around published positions; probably the co-ordinates are largely in error, or the charts are wrong. The position of Nova V906 Oph has been measured by us on prints sent to our group by W. Wenzel (Sonneberg) and found to be 17h26m0.7s, -21d54'28", 2000.0, with probable accuracy about +/-5". These co-ordinates differ considerably from those published by Solovyov (1956) and Khatisov (1971). We are very grateful to Dr. W. Wenzel and Mr. A. Paschke for sending us their unpublished materials. This study was partially supported by the European Southern Observatory through grant No. A-02-047. S. V. ANTIPIN Sternberg Astronomical Institute, 13, University Ave., Moscow 119899, Russia N. N. KIREEVA, N. N. SAMUS Institute of Astronomy of Russian Acad. Sci., 48, Pyatnitskaya Str., Moscow 109017, Russia References: Antipin, S. V., Kireeva, N. N., and Samus, N. N., 1994, Inf. Bull. Var. Stars, No. 4020 Khatisov, A. Sh., 1971, Abastumani Bull., No. 40, 13 [BIBCODE 1971AbaOB..40...13K ] Plaut, L., 1968, Bull. Astron. Inst. Netherl., Suppl. Ser., 2, No. 6 [BIBCODE 1968BANS....2..293P ] Shajn, P., 1934, Perem. Zvezdy, 4, 261 Solovyov, A. V., 1956, Astron. Tsirk., No. 170 Strohmeier, W., Fischer, H., Ott, H., 1966, Inf. Bull. Var. Stars, No. 120