NGC 4590 / C1236-264 / Messier 68 (Updated January 2012) RA: 12:39:27.98 DEC: -26:44:38.6 (J2000) ============================================================ Bytes Format Explanation 1-8 A8 Star ID 10-32 A11,1x,A11 Position 34-35 A2 Units for position R0 denotes RA, DEC in the J2000 coordinates R5 denotes RA, DEC in the 1950 coordinates XA denotes X, Y in arcseconds XP denotes X, Y in pixels 37-44 F8.4 Period (days) 46-51 F6.3 Mean magnitude (or maximum magnitude if "max" is indicated in the remarks column) 53-57 F5.3 Light amplitude (range of variability) 59 A1 Colour for mean magnitude and amplitude e.g. B, V, R, I or P (for photographic). 61-65 A5 Type of variable (draft 2006 GCVS classifications) NV denotes not variable 67-80 A19 Notes and Remarks (f denotes field star) "--" or "----" indicates no data available ========================================================================= ID Position Period ampl C Type Notes/ RA/X Dec/Y Units Remarks ========================================================================= 1 12:39:06.87 -26:42:53.3 R0 0.3496 15.628 0.59 V RR1 2 12:39:15.30 -26:45:24.5 R0 0.5782 15.721 0.69 V RR0 Bl 3 12:39:17.35 -26:43:09.9 R0 0.3908 15.654 0.49 V RR01 4 12:39:19.07 -26:46:51.3 R0 0.3960 15.638 0.47 V RR01 5 12:39:23.84 -26:41:51.9 R0 0.2821 15.697 0.41 V RR1 6 12:39:23.78 -26:44:23.4 R0 0.3686 15.670 0.49 V RR1 7 12:39:24.05 -26:45:57.7 R0 0.3880 15.650 0.49 V RR01 8 12:39:25.19 -26:46:52.7 R0 0.3904 15.648 0.44 V RR01 9 12:39:25.58 -26:44:00.8 R0 0.5790 15.635 0.60 V RR0 Bl 10 12:39:25.94 -26:44:54.8 R0 0.5513 15.670 0.85 V RR0 Bl 11 12:39:26.57 -26:46:32.7 R0 0.3649 15.643 0.51 V RR1 12 12:39:26.92 -26:44:39.7 R0 0.6158 15.476 0.78 V RR0 Bl? 13 12:39:27.49 -26:45:36.0 R0 0.3618 15.694 0.52 V RR1 14 12:39:27.55 -26:41:04.0 R0 0.5568 15.682 1.05 V RR0 15 12:39:28.50 -26:43:40.6 R0 0.3723 15.579 0.44 V RR1 16 12:39:28.54 -26:43:22.0 R0 0.3820 15.692 0.44 V RR1 17 12:39:29.04 -26:45:52.3 R0 0.6676 15.667 0.56 V RR0 Bl 18 12:39:29.13 -26:46:15.0 R0 0.3674 15.687 0.50 V RR1 19 12:39:30.16 -26:43:30.2 R0 0.3917 15.653 0.48 V RR01 20 12:39:30.27 -26:46:33.0 R0 0.3858 15.649 0.48 V RR1 21 12:39:31.21 -26:44:31.2 R0 0.4071 15.612 0.36 V RR01 22 12:39:32.30 -26:45:01.7 R0 0.5634 15.571 1.02 V RR0 23 12:39:32.41 -26:38:22.7 R0 0.6789 15.568 0.97 V RR0 24 12:39:33.16 -26:44:46.7 R0 0.3765 15.648 0.49 V RR1 25 12:39:38.16 -26:42:37.0 R0 0.6415 15.609 0.75 V RR0 Bl 26 12:39:39.47 -26:45:22.9 R0 0.4070 15.685 0.40 V RR01 27 12:39:55.93 -26:40:17.0 R0 324.1 13.8 7.2 P M f;Note 28 12:40:00.32 -26:41:59.5 R0 0.6068 16.06 1.21 B RR0 Note 29 12:39:48.94 -26:47:09.9 R0 0.3952 15.642 0.41 V RR01 30 12:39:36.09 -26:45:55.7 R0 0.7336 15.608 0.38 V RR0 31 12:39:19.67 -26:43:05.3 R0 0.3997 15.640 0.46 V RR01 32 12:39:03.29 -26:55:18.0 R0 0.5882 16.02 1.08 B RR0 Note 33 12:39:34.41 -26:43:40.5 R0 0.3906 15.651 0.43 V RR1 34 12:39:47.57 -26:41:03.0 R0 0.4001 15.636 0.42 V RR01 35 12:39:25.20 -26:45:32.6 R0 0.7025 15.534 0.98 V RR0 36 12:39:24.93 -26:45:31.8 R0 0.4110 15.649 0.51 V RR01 37 12:39:26.20 -26:44:21.0 R0 0.3846 15.584 0.43 V RR1 38 12:39:26.13 -26:45:08.0 R0 0.3829 15.567 0.46 V RR1 39 12:39:24.44 -26:44:51.5 R0 0.0641 18.05 0.71 V SXPHE 40 12:39:27.91 -26:45:32.4 R0 ---- 18.31 -- V NV SGBstar 41 12:39:28.37 -26:43:19.0 R0 ---- 17.98 -- V NV RGBstar 42 12:39:27.47 -26:44:04.4 R0 ---- 18.36 -- V NV SGBstar 43 12:39:29.10 -26:45:43.5 R0 0.3707 15.699 0.53 V RR1 44 12:39:29.51 -26:44:38.7 R0 0.3851 15.600 0.42 V RR1 45 12:39:29.90 -26:44:48.9 R0 0.3909 15.549 0.35 V RR01 46 12:39:24.89 -26:44:43.6 R0 0.7382 15.622 0.48 V RR0 Bl? 47 12:39:28.81 -26:44:20.1 R0 0.3729 15.549 0.46 V RR1 48 12:39:38.29 -26:46:12.3 R0 0.0432 17.27 0.17 V SXPHE =================================================================== Supplementary Notes and References The RA and dec for V1-48 are from Samus et al. (2009). The periods, magnitudes, amplitudes and variability types for V1-48 are from Walker (1994) unless indicated otherwise in the Notes on individual stars. =================================================================== Notes on individual stars V27 = FI Hya Shapley (1920) recognized that V27 is a long period variable and Greenstein et al. (1947) established that is a foreground star, not a cluster member, based on the radial velocity they measured. The period listed above is from the GCVS and the magnitudes were measured by Rosino & Pietra (1954a,b). The images of V27 were saturated in Walker's (1994) data. V28, V32: These two variables were outside Walker's (1994) field of view. The periods, B magnitudes, amplitudes and classifications are from Clement et al. (1993). =================================================================== Discovery of the variable stars in NGC 4590 (M68): V1-19 Shapley (1919) with x,y coordinates V20-28 Shapley (1920) with x,y coordinates and an ID chart for V1-28 He also listed their photographic magnitudes from 10 plates and these were used by Sawyer (1939) to derive max and min magnitudes for her first catalogue of variable stars in globular clusters. V29-31 Rosino & Pietra (1954a,b) with x,y coordinates V32-38 van Agt & Oosterhoff (1959) with x,y coordinates and ID charts for V1-38 V32 was previously announced as HV 11069 with RA and dec (1900) by Buttery (1942). It has subsequently been desginated as EN Hya in the GCVS. V39-42 Terzan et al. (1973) with x,y coordinates and an ID chart They also announced five new variables in the field around the cluster. V43-48 Walker (1994) with ID chart for all the variables in his investigation. For the variables that were not RR Lyrae, he also published X,Y coordinates in pixels. ============================================================== References Buttery, I. G. 1942, Harv. Ann., 109, 25 Clement, C. M., Ferance, S., Simon, N. R. 1993, ApJ, 412, 183 Greenstein, J. L., Bidelman, W. P., Popper, D. M. 1947, PASP, 59, 143 Rosino, L. & Pietra, S. 1954a, Mem. S.A. I., 25, 227 Rosino, L. & Pietra, S. 1954b, Bologna Publ., 6, No. 5 Samus, N. N., Kazarovets, E. V., Pastukhova, E. N., Tsvetkova, T. M., Durlevich, O. V. 2009, PASP, 121, 1378 Shapley, H. 1919, PASP, 31, 226 Shapley, H. 1920, ApJ, 51, 49 Terzan, A., Rutily, B., Ounnas, Ch. 1973, IAU Colloq. No. 21, Variable Stars in Globular Clusters and in Related Systems, 76 van Agt, S. L. Th. J. & Oosterhoff, P. Th. 1959, Leid. Ann., 21, 253 Walker, A. R. 1994, AJ, 108, 555