COMMISSIONS 27 AND 42 OF THE IAU INFORMATION BULLETIN ON VARIABLE STARS Number 3739 Konkoly Observatory Budapest 26 June 1992 HU ISSN 0374 - 0676 THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS (AAVSO) PHOTOELECTRIC PHOTOMETRY ARCHIVE The AAVSO photoelectric photometry program was established about ten years ago by Janet A. Mattei and John R. Percy to obtain long-term, high-precision observations of stars with variations too small to be monitored by visual techniques. Some of these stars have larger-amplitude variations on one time scale, and smaller-amplitude variations on another. The original program included 51 semi-regular red variables, 6 yellow supergiants (RV Tau and SRd), and 13 variables of other or unknown kind. A few additional stars have subsequently been added, either by us or at the request of other astronomers. Most of the stars are between magnitudes 4 and 7; Betelgeuse is a very bright exception. They typically have amplitudes of a few tenths of a magnitude, time scales of weeks or months, and generally semi-regular or irregular light curves. All are well suited far long-term monitoring from small "backyard" observatories. Howard J. Landis chairs the AAVSO's Photoelectric Photometry Committee, and also assists, advises and encourages the observers. He also reduces most of the data and archives it. John R. Percy co-ordinates the scientific aspects of the program, with advice from Janet A. Mattei, and edits the AAVSO Photoelectric Newsletter which is published three times a year. The program has now produced over 7,000 observations. In addition to the observations of the "program stars" listed in Table l, there are observations of about 30 small-amplitude red variables, obtained as part of "Project SARV" (Percy 1991a). Table 1 gives the name and position (epoch 2000) of each program star, the number of observations obtained in each year (and in total), the spectral type, the variable star type, range and period (from the General Catalogue of Variable Stars). The range is visual unless denoted B (blue) or p (photographic). The results of our observations of some of these stars (marked with an * in the last column) have been discussed in a brief review by Percy (1991b). Table 1: AAVSO Photoelectric Observations to December 31, 1991 Name Ra (2000) Dec. 1983 84 85 86 87 88 89 90 91 TOTAL SpT Type Range Period T CET 00h 21.7m -20d03' 2 10 6 AG CET 00 27.7 -11 31 1 TV PSC 00 28.0 +17 52 6 10 17 9 19 74 80 EG AND 00 44.6 +40 40 8 1 6 7 9 7 Z ERI 02 47.9 -12 27 6 3 14 14 RR ERI 02 52.2 -08 15 3 3 3 7 RZ ARI 02 55.8 +18 18 9 2 20 9 25 25 45 45 rho PER 03 05.1 +38 49 10 22 14 23 26 38 41 50 X PER 03 55.4 +31 03 11 5 4 11 25 24 10 10 CE TAU 05 32.2 +18 35 7 4 28 31 17 54 26 13 alpha ORI 05 55.2 +07 23 2 1 10 1 10 19 11 30 22 SS LEP 06 05.0 -16 27 2 1 1 46 15 12 4 eta GEM 06 14.9 +22 30 4 2 23 31 34 39 51 41 IS GEM 06 49.7 +32 37 4 4 2 4 12 24 51 9 V6114 MON 07 01.0 -03 13 2 1 7 4 6 47 EW CMA 07 14.3 -26 21 1 4 4 7 1 VZ CAM 07 31.6 +82 24 1 1 RU CAM 07 21.7 +69 39 2 3 9 1 U MON 07 30.8 -09 46 1 4 9 11 16 12 33 14 AK HYA 08 39.9 -17 17 2 1 8 25 RS CNC 09 10.6 +30 57 8 3 23 46 53 73 44 IN HYA 09 20.5 +00 10 18 5 1 12 20 VY UMA 10 45.1 +67 24 9 56 11 14 24 10 VW UMA 10 59.1 +69 58 4 16 7 10 8 4 TV UMA 11 45.6 +35 53 4 3 1 5 1 GK COM 12 00.1 +19 22 3 1 9 2 12 6 FS COM 13 06.4 +22 37 10 4 58 28 70 77 49 77 55 SW VIR 13 14.1 -02 47 9 3 7 0 2 9 1 FH VIR 13 16.4 +06 30 8 5 5 24 FP VIR 13 35.9 +08 16 9 3 5 2 23 73 EV VIR 14 13.2 -13 51 4 2 2 W BOO 14 43.4 +26 31 11 10 35 17 44 60 42 119 140 tau4 SER 15 36.5 +15 06 13 2 2 14 7 23 ST HER 15 51.8 +48 29 6 4 2 1 15 13 10 2 AT DRA 16 17.3 +39 46 2 1 12 AAVSO PEP OBSERVATIONS TO JANUARY 1, 1992 Name Ra (2000) Dec. 1983 84 85 86 87 88 89 90 91 TOTAL SpT Type Range Period alpha SCO 16 29.4 -26 25 2 2 4 5 12 9 AZ DRA 16 40.7 +72 40 1 8 1 VW DRA 17 16.5 +60 39 3 19 7 24 6 V449 SCO 17 37.0 -32 08 2 V533 OPH 17 53.0 -02 35 2 4 V441 HER 17 55.6 +26 04 1 9 24 26 58 35 27 V2048 OPH 18 00.3 +04 22 1 9 16 19 35 22 d SER 18 27.2 +00 12 3 42 24 14 9 AC HER 18 30.3 +21 52 10 16 17 11 10 10 11 2 R LYR 18 55.3 +43 57 4 20 1 17 14 78 82 124 100 RY SGR 19 16.5 -33 31 39 CH CYG 19 24.6 +50 15 2 1 1 21 49 55 25 11 4 V973 CYG 19 44.8 +40 44 1 1 2 CSV 5011 20 03.0 +57 04 1 2 1 7 27 CYG 20 06.4 +35 58 26 16 P CYG 20 17.8 +38 02 42 45 78 64 40 42 38 EU DEL 20 37.9 +18 17 45 47 34 29 57 68 63 28 39 U DEL 20 45.5 +18 04 2 3 5 24 47 V832 CYG 20 59.8 +47 32 3 7 8 11 FZ CEP 21 19.7 +55 26 3 1 V1070 CYG 21 22.9 +40 56 6 2 6 1 W CYG 21 36.0 +45 22 1 5 19 13 15 24 4 7 AB CYG 21 36.6 +32 07 1 2 1 1 1 1 9 V1339 CYG 21 42.2 +45 45 4 5 7 16 32 31 21 mu CEP 21 43.5 +58 47 2 41 39 46 49 22 HK LAC 22 04.9 +47 05 15 2 28 2 2 2 DM CEP 22 08.3 +72 46 1 CSV 8775 22 33.7 +56 38 4 1 4 29 18 EW LAC 22 57.1 +48 41 2 2 10 15 16 8 V509 CAS 23 00.1 +56 57 13 22 5 20 30 10 SZ PSC 23 13.4 +02 42 12 2 1 khi AQR 23 16.8 -07 44 31 16 9 31 37 lambda AND 23 37.6 +46 27 23 42 52 10 16 37 TX PSC 23 46.4 +03 30 3 4 32 74 rho CAS 23 54.4 +57 29 3 21 28 64 79 65 38 20 XZ PSC 23 54.8 +00 05 2 3 1 10 23 64 [Some columns of table are missing] The following observers have contributed data to the archive: Paul Beckmann (46), Bill Barksdale (246), Wayne Clark (95), Louis Cox (27), David Curott (402), Robert DeMartino (1), Frank Dempsey (150), Ales Dolzan (3), George Fortier (162), Guillermo Gonzalez (2), Robert Johnsson (54), Koster (deceased) (84), George Kohl (354), Paul Kneipp (82), Kenneth Luedeke (399), Howard Landis (1085), Thomas Langhans (266), Frank Mellilo (8), Russell Milton (688), Donald Pray (362), Mike Potter (17), Harry Powell (144), Luciano Pazzi (12), Gordon Ripley (6), Robert Reisenweber (190), Donald Shannon (15), Douglas Slauson (16), Mike Smith (672), Lee Snyder (124), Jim Soder (deceased) (10), Hans Sorensen (228), Robert Schmidt (30), Raymond Thompson (387), Jim Waller (9), Paul Werner (1), David Williams (8), Jim Wood (948), Thomas Walker (38), Rick Wasatonic (154). Copies of the data can be obtained on paper or diskette by writing to AAVSO Headquarters, 25 Birch Street, Cambridge MA 02138-1205, USA (phone (617) 354-0484; Fax (617) 354-0665, e-mail AAVSO@CEAS). There is a nominal charge to cover the handling and mailing of the data. Acknowledgements. We thank all of the observers listed above for their contribution to the AAVSO Photoelectric Archive. HOWARD J. LANDIS 50 Price Drive West Locust Grove GA 30248-9173 USA JOHN R. PERCY Erindale Campus University of Toronto Mississauga, Ontario Canada L5L 1C6 JANET A. MATTEI AAVSO 25 Birch Street Cambridge MA 02138-1205 USA References: Percy, J.R. 1991a, IAPPP Communications #45, 24 [BIBCODE 1991IAPPP..45...24P ] Percy, J.R. 1991b, IAPPP Communications #45, 33 [BIBCODE 1991IAPPP..45...33P ]