COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS Number 1815 Konkoly Observatory Budapest 1980 July 11 A LIST OF ECLIPSING BINARIES TO BE CONTINUOUSLY MONITORED The study of apsidal motion in eclipsing binaries depends very strongly on timings of minimum light observed along many years. These measurements are very easy to accomplish with normal photoelectric equipments and may be included within other scientific programs without much extra work. The usefulness of this kind of studies has been already stressed by many authors since apsidal motion in eclipsing binaries remains as one of the best ways to approach empirically the interior of the stars. For this reason, a list of 55 binary systems is presented in this communication including not only those eclipsing binaries already known to exhibit apsidal motion but also those candidates with promising characteristics that for the moment have not been analyzed because of the lack of sufficient observed data. The present list has been made as a selection from a more extended compilation of binaries suspected of apsidal motion at any time, eliminating the systems with photometric, theoretical or any other type of complication blocking the possibility to reach confident conclusions from the observations. In the table is given the name of the star as a variable (although some of them are probably better known through their HD, HR, VV or other names). Also the position in the sky is included using the Right ascension and the Declination for the epoch 1900.0 as given in the "General Catalogue of Variable Stars". The period of the binary is listed to four decimals and another column gives approximated values of the visual magnitude outside eclipses and during primary minimum. All these figures are given as an indication for observers when planning their work. Many of the systems are also included in the "Rocznik Astronomiczny Table I 1 V539 Ara 17h 42m 18s -53deg 25'.0 5.66-6.19 3.1691d 2 AS Cam 05 24 18 69 27.0 8.2-8.8 1.7155 3 GL Car 11 10 21 -60 06.9 8.9-9.6 2.4222 4 GR Car 10 34 59 -57 41.4 13.6-14.0 17.1359 5 QX Car 09 51 20 -57 56.9 6.46-7.0 4.4772 6 PV Cas 23 05 45 58 39.6 9.9-10.6 1.7505 7 V459 Cas 01 05 12 60 36.9 11.4-12.0 8.4583 8 KT Cen 11 43 14 -61 47.8 12.0-12.4 4.1304 9 V346 Cen 11 38 04 -61 52.8 8.3-8.7 6.3223 10 V384 Cen 11 34 37 -61 37.1 11.8-12.4 12.6352 11 CW Cep 23 00 01 62 51.5 7.6-8.06 2.7291 12 EK Cep 21 39 38 69 14.2 8.2-9.5 4.4278 13 TV Cet 03 09 25 02 22.9 8.6-9.3 9.1033 14 UX Cru 12 12 40 -62 08.7 11.7-12.1 12.2975 15 Y Cyg 20 48 04 34 16.9 7.2-7.8 2.9963 16 V380 Cyg 19 47 11 40 20.7 5.5-5.62 12.4257 17 V453 Cyg 20 02 49 35 27.2 8.3-8.6 3.8898 18 V477 Cyg 20 01 31 31 41.2 8.3-9.2 2.3470 79 V541 Cyg 19 38 35 31 05.3 10.2-10.9 15.3381 20 V1136 Cyg 19 33 49 28 37.1 12.2-12.9 3.4628 21 V1143 Cyg 19 36 27 54 44.5 5.9-6.4 7.6408 22 DI Her 18 49 17 24 09.3 8.3-9.0 10.5502 23 AI Hya 08 13 38 00 35.6 9.0-9.5 8.2897 24 SS Lac 22 00 42 45 56.5 10.1-10.5 14.4163 25 CO Lac 22 42 27 56 18.6 10.4-11.0 1.5422 26 ES Lac 22 2B 18 53 27.0 11.4-12.0 4.4593 27 MZ Lac 22 24 06 53 10.2 11.2-12.1 3.1588 28 V345 Lac 22 14 58 54 10.4 10.7-11.4 7.4918 29 RR Lyn 06 17 59 56 20.3 5.6-6.0 9.9450 30 UX Men 02 51 37 -76 11.9 8.6-9.4 4.1811 31 GM Nor 15 44 09 -55 03.7 11.6-12.1 1.8845 32 GN Nor 15 47 16 -54 13.8 12.6-13.3 5.7034 33 HH Nor 15 36 05 -51 31.6 10.3-11.5 8.5831 34 V451 Oph 18 24 32 10 49.6 7.86-8.46 2.1966 35 EW Ori 05 14 57 01 56.5 10.4-11.2 6.9368 36 FH Ori 05 18 00 04 11.0 10.5-11.5 2.1512 37 FL Ori 05 02 45 -02 53.0 10.5-13.2 1.5510 Table I (cont.) 38 FT Ori 06 07 58 21 27.3 9.1-9.7 3.1504 39 GG Ori 05 38 05 -00 44.3 10.0-10.6 6.6315 40 AG Per 04 00 32 33 10.6 6.5-6.8 2.0287 41 IQ Per 03 52 30 47 51.9 7.5-8.0 1.7436 42 Tseta Phe 01 04 11 -55 46.8 4.0-4.5 1.6699 43 KX Pup 07 47 51 -26 07.5 11.6-12.0 2.1468 44 NO Pup 08 22 37 -38 43.9 6.7-7.1 1.2569 45 YY Sgr 18 38 42 -19 29.4 9.8-10.5 2.6285 46 V523 Sgr 18 56 35 -29 17.1 10.1-10.4 2.3238 47 V526 Sgr 19 01 49 -31 30.3 9.9-10.7 1.9194 48 V1647 Sgr 17 52 26 -36 55.7 7.0-7.15 3.2828 49 V2283 Sgr 17 57 51 -36 55.0 10.1-10.9 3.4714 50 V629 Sco 17 11 27 -38 57.2 11.9-12.4 3.2491 51 AP Tau 04 48 33 26 45.6 13.4-14.1 0.9720 52 AO Vel 08 08 55 -48 26.6 9.6-10.0 1.5846 53 EO Vel 08 35 35 -43 22.7 11.1-11.7 5.3296 54 DR Vul 20 09 36 26 26.9 8.6-9.3 2.2508 55 FQ Vul 19 31 30 26 03.7 12.3-12.9 6.2624 Obserwatorium Krakowskiego" where ephemerides and predicted times of minimum for each year can be found. Information concerning these stars like unpublished data, re-discussions, new orbits, times of minimum, etc., should be most acknowledged by the authors. ALVARO GIMENEZ ANTONIO J. DELGADO Instituto de Astrofisica de Andalucia Apartado 2144,Granada,Spain