NGC 6388 / C1732-447 RA: 17:36:17.23 DEC: -44:44:07.8 (J2000) (Most recent updates: Membership probability flag - 2024; Remaining data - January 2015) ============================================================ Bytes Format Explanation 1-8 A8 Star ID 10-32 A11,1x,A11 Position 34-35 A2 Membership probability flag based on data published by Prudil & Arellano Ferro (2024) m1: prob >=0.85; m2: prob >=0.7 and <0.85; m3: prob >= 0.5 and <0.7; f: prob <0.5 u: no data available 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, J, K or P (for photographic). 61-65 A5 Type of variable (draft 2006 GCVS classifications) CST denotes non variable stars previously designated as variables 67-80 A19 Notes and Remarks (f denotes field star) "--" or "----" indicates no data available ========================================================================= ID Position Mem Period ampl C Type Notes/ RA Dec Flag Remarks ========================================================================= 1 17:36:15.44 -44:44:15.2 m1 ---- -- -- M LM 2 17:36:18.49 -44:44:19.2 f ---- -- -- M LM 3 17:36:15.04 -44:43:32.5 f 156.0 8.97 0.28 K M Sl 4 17:35:58.94 -44:43:39.8 m1 253.0 8.47 0.80 K M Sl;Note 5 17:36:23.43 -44:44:22.3 m1 ---- 14.6 0.8 V L LM 6 17:36:17.37 -44:45:46.0 m1 ---- 15.35 0.7 V L LM 7 17:36:08.13 -44:45:02.2 m1 ---- 15.2 0.8 V L LM 8 17:36:18.14 -44:43:24.5 f ---- 13.7 0.6 V L LM 9 17:36:14.86 -44:43:12.2 m1 ---- 15.75 0.3 V L LM 10 17:36:20.97 -44:40:52.6 f ---- 14.45 0.5 V L LM 11 17:36:16.37 -44:40:38.1 m1 ---- 15.75 0.9 V L LM 12 17:36:11.41 -44:44:07.9 m1 ---- 14.6 0.6 V L LM 13 17:36:56.51 -44:45:51.3 f ---- 17.1 -- B L f?;HH 14 17:35:59.72 -44:49:24.2 f 2.16 16.179 1.30 V E f?;Note 15 17:35:39.03 -44:39:36.3 f ---- 16.2 -- B E f?;HH 16 17:35:52.22 -44:39:57.3 f 0.251 16.895 0.26 V RR1 Note 17 17:36:13.6 -44:44:33 f 0.611 16.525 0.85 V RR0 18 17:36:14.5 -44:43:21 f 2.89 15.616 0.77 V CW 19 17:36:21.12 -44:43:46.5 f ---- -- -- CST Note 20 17:36:22.4 -44:43:28 f 0.467 16.787 0.36 V RR1 21 17:36:23.43 -44:41:49.7 m1 0.814 17.030 0.87 V RR0 22 17:36:23.7 -44:44:13 f 0.587 16.858 1.12 V RR0 23 17:36:00.12 -44:43:46.8 m1 0.338 16.893 0.48 V RR1 24 17:36:15.38 -44:36:28.8 f 0.322 16.8 0.6 B RR1 f?;HH 25 17:36:33.52 -44:45:48.0 f ---- 16.15 -- B L HH 26 17:36:27.8 -44:45:14 m1 0.2390 17.403 0.38 V RR1 f? 27 17:36:22.80 -44:44:23.7 m1 0.365 16.953 0.46 V RR1 28 17:36:19.4 -44:44:59 f 0.840 16.820 0.80 V RR0 29 17:36:15.32 -44:44:02.6 u 1.8652 14.63 0.77 I CWB Sk 30 17:36:21.77 -44:44:17.0 m1 0.951 16.766 -- V RR0? 31 17:36:28.67 -44:42:32.6 m1 0.341 17.031 0.52 V RR1 32 17:36:13.57 -44:44:36.0 f 0.522 16.578 0.42 V RR1 33 17:36:23.48 -44:42:44.5 m1 0.558 16.747 0.29 V RR1 34 17:35:58.98 -44:44:53.5 m2 0.236 17.409 0.36 V RR1 f? 35 17:36:23.92 -44:40:39.7 m3 0.300 17.041 0.18 V RR1 36 17:36:19.80 -44:43:51.6 m1 3.10 15.558 1.05 V CW 37 17:36:17.23 -44:44:31.6 f 10.0 14.707 -- V CW 38 17:36:16.47 -44:47:52.2 u 0.412 18.270 0.46 V EC f? 39 17:36:27.16 -44:37:13.2 f 0.537 17.996 0.28 V EC f? 40 17:36:23.67 -44:40:35.6 u 0.311 18.806 0.39 V EC f? 41 17:36:55.12 -44:39:21.1 f 1.71 17.364 2.20 V E f? 42 17:36:40.36 -44:41:13.3 f 1.82 15.724 0.48 V E f? 43 17:36:02.58 -44:43:45.3 m1 2.02 19.606 1.22 V E f? 44 17:35:57.30 -44:44:40.5 f 0.080 18.082 0.50 V SX? f?;DSct? 45 17:36:33.23 -44:39:23.8 u ---- -- -- L 46 17:36:09.37 -44:44:43.5 m1 ---- -- -- L 47 17:36:43.71 -44:47:07.9 f ---- -- -- L 48 17:36:19.79 -44:43:53.7 u 0.355 16.574 -- V RR1? 49 17:36:18.11 -44:44:47.6 f 0.384 16.925 0.52 V RR1? 50 17:36:15.13 -44:43:43.9 m1 0.364 16.898 0.54 V RR1? 51 17:36:19.68 -44:44:34.4 f 0.397 16.604 0.34 V RR1? 52 17:36:00.05 -44:47:22.5 u 0.387 16.686 0.23 V RR1? 53 17:36:09.63 -44:43:30.8 m1 0.986 16.868 -- V RR0? 54 17:35:58.00 -44:44:26.1 m2 0.366 19.447 0.67 V EC 55 17:36:18.53 -44:45:11.9 f 0.489 16.795 -- V RR1? 56 17:36:15.08 -44:44:20.7 m1 0.552 16.825 -- V RR1? 57 17:35:49.50 -44:40:52.5 u 0.278 19.116 0.80 V EC 58 17:36:14.58 -44:44:14.1 f 0.683 -- -- V RR0 Corw 59 17:36:17.87 -44:43:54.8 f 0.5888 15.48 0.39 I RR0 Sk 60 17:36:17.17 -44:44:24.4 u 0.3734 16.19 0.31 I RR1 Sk 61 17:36:16.00 -44:44:12.7 u 0.6559 15.94 0.83 I RR0 Sk 62 17:36:16.40 -44:44:07.9 m1 0.7113 15.79 0.51 I RR0 Sk 63 17:36:17.94 -44:44:09.5 m3 2.038 14.64 0.73 I CWB Sk 64 17:36:16.96 -44:44:16.7 u 0.6014 15.35 0.43 I RR0 Sk 65 17:36:16.66 -44:43:50.6 f 0.3960 16.19 0.36 I RR1 Sk 66 17:36:16.17 -44:44:17.0 u 0.3499 15.25 0.19 I RR1 Sk 67 17:36:04.77 -44:45:21.7 u 2.27 -- -- V CW Corw 68 17:36:18.23 -44:43:39.1 m1 0.946 -- -- V RR0? Corw 69 17:36:17.44 -44:44:18.5 f 3.539 14.55 0.47 I CWB Sk 70 17:36:17.54 -44:43:59.5 f 12.38 13.28 0.24 I CWA Sk 71 17:36:17.75 -44:44:04.2 f 0.854 13.96 0.05 I RR0 Sk 72 17:36:17.53 -44:44:16.2 f 18.01 13.08 0.82 I CWA Sk 73 17:36:17.21 -44:44:14.7 f 26.1 12.74 1.11 I CWA Sk 74 17:36:15.45 -44:44:23.4 f 0.3584 15.96 0.12 I RR1? 75 17:36:17.01 -44:44:17.8 u 0.4039 16.07 0.22 I RR1 76 17:36:16.48 -44:44:01.3 f 0.7574 15.98 0.67 I RR0 77 17:36:17.40 -44:44:14.1 f 1.8643 14.30 0.44 I AC 78 17:36:15.37 -44:43:54.1 f 24.0 12.80 0.04 I SR 79 17:36:17.45 -44:44:07.3 f 27.07 12.46 0.05 I SR 80 17:36:17.29 -44:44:18.5 f 30.28 12.86 0.20 I RV 81 17:36:16.69 -44:44:23.0 f 33.78 12.58 0.08 I SR 82 17:36:17.84 -44:43:56.9 f 40.47 12.89 0.06 I RV 83 17:36:15.52 -44:44:26.4 m3 50.68 12.42 0.15 I SR 84 17:36:15.89 -44:44:04.6 f 55.5 12.85 0.05 I SR 85 17:36:16.96 -44:43:59.0 m2 56.8 13.03 0.07 I SR 86 17:36:18.20 -44:44:00.4 f 57.0 12.75 0.08 I SR 87 17:36:18.10 -44:44:16.7 m1 58.3 12.99 0.04 I SR 88 17:36:16.09 -44:44:09.4 f 58.3 12.20 0.35 I SR 89 17:36:16.93 -44:44:23.8 f 70.7 12.42 0.11 I SR 90 17:36:16.78 -44:44:01.9 f 70.8 12.34 0.14 I SR 91 17:36:17.29 -44:44:06.9 f 113.9 12.65 0.05 I SR 92 17:36:15.31 -44:44:11.2 f 114.2 12.60 0.65 I SR 93 17:36:17.55 -44:44:08.7 m1 157.0 11.97 0.43 I SR 94 17:36:17.90 -44:44:21.6 m1 177.0 13.34 0.06 I SR 95 17:36:15.41 -44:44:14.9 m1 180.0 11.91 1.06 I SR 96 17:36:18.43 -44:44:19.1 f ---- 12.51 1.55 I L 97 17:36:17.11 -44:43:57.9 f ---- 12.43 0.84 I L 98 17:36:17.11 -44:44:00.4 f ---- 12.52 0.60 I L 99 17:36:17.59 -44:44:08.0 m1 ---- 12.37 0.35 I L 100 17:36:17.21 -44:44:14.0 f ---- 12.53 0.34 I L 101 17:36:17.73 -44:44:13.6 f ---- 12.58 0.26 I L 102 17:36:15.97 -44:43:48.6 m1 ---- 12.54 0.21 I L 103 17:36:17.24 -44:44:08.8 f ---- 12.13 0.20 I L 104 17:36:17.40 -44:44:08.4 f ---- 12.07 0.15 I L 105 17:36:17.46 -44:44:13.5 f ---- 12.27 0.14 I L 106 17:36:16.41 -44:44:10.9 f ---- 12.28 0.12 I L 107 17:36:17.73 -44:44:22.1 f ---- 12.41 0.12 I L 108 17:36:18.89 -44:44:04.2 f ---- 12.68 0.12 I L 109 17:36:18.93 -44:44:14.1 m2 ---- 12.63 0.09 I L 110 17:36:18.04 -44:44:17.6 m1 ---- 12.38 0.08 I L 111 17:36:16.78 -44:44:07.0 f ---- 12.73 0.08 I L 112 17:36:17.87 -44:44:03.2 f ---- 12.88 0.07 I L 113 17:36:18.00 -44:43:52.7 f ---- 13.35 0.06 I L 114 17:36:16.14 -44:44:04.6 m1 ---- 12.71 0.05 I L 115 17:36:17.17 -44:44:05.7 f ---- 12.11 0.04 I L 116 17:36:18.92 -44:43:56.8 m1 ---- 13.24 0.04 I L 117 17:36:17.23 -44:44:04.4 m3 ---- 12.83 0.04 I L 118 17:36:17.15 -44:44:10.9 f ---- 12.95 0.04 I L 119 17:36:18.09 -44:44:08.6 f ---- 12.53 0.05 I L? 120 17:36:17.34 -44:43:53.9 f ---- -- -- ? 121 17:36:17.58 -44:43:50.6 f ---- -- -- ? ========================================================================= Supplementary Notes NGC 6388 is a massive Galactic bulge cluster with [Fe/H]= -0.55 according to the 2010 version of the Harris (1996) catalogue. Pritzl et al. (2002) discovered that it had a significant number of RR Lyrae variables with relatively long periods, an unexpected result for such a metal rich cluster. NGC 6388 shares these properties with NGC 6441. Bellini et al. (2013) have examined the CM diagrams for both clusters and provided evidence that both clusters host at least two stellar populations. The RA and dec in the above table are from the following sources: V1-26 and V28 from Samus et al. (2009). V70-121 and the variables indicated by "Sk" in the remarks column from Skottfelt et al. (2015). For the remaining variables, the RA and dec were derived from the Delta RA and Delta dec coordinates published by Pritzl et al. (2002) or by Corwin et al. (2006). For these calculations, it was assumed that the position of the cluster centre was RA=17:36:17.15 and dec=-44:44:06.9. These coordinates for the cluster centre yielded RA and dec in agreement with the values that Samus et al. derived for V1-26 and matched with the 2MASS catalogue. The remaining data for V1-73 in the above table are from Pritzl et al. (2002) unless designated LM, Sl, HH, Corw or Sk in the remarks column: in which case they are from LM Lloyd Evans & Menzies (1977), Sl Sloan et al. (2010), HH Hazen & Hesser (1986), Corw Corwin et al. (2006) or SK Skottfelt et al. (2015). Most of the "HH" variables are considered to be field variables because they are outside the tidal radius which is 6.75 arcmin according to the 2010 version of the Harris (1996) catalogue. All the data for V74-V121 are from the discovery paper by Skottfelt et al. (2015). ========================================================================== Notes on individual stars V4: Samus et al. (2009) pointed out that V4 is MU Sco in the GCVS and HV 6570. Its variability was announced by Shapley & Swope (1940). V14, V16: There is a difference of 6 arcsec between the y coordinates derived by Hazen & Hesser (1986) and by Pritzl et al. (2002) for these two stars. However, it appears that they indicate the same stars on their ID charts. The RA and dec in the above table were derived by Samus et al. (2009) who matched both stars with 2MASS sources. V19: It appears unlikely that this star is variable because Corwin et al. (2006) did not detect any variability when they applied image subtraction to their observations. Furthermore, when Hazen & Hesser (1986) "discovered" its variability, they noted that it was part of a close pair and indicated that the star varied on a time scale of less than 2 days. Variability on such a short time scale should have been detected by Pritzl et al. (2002) or by Corwin et al. (2006). ========================================================================== Discovery of the variable stars in NGC 6388: V1-9 = V1-4, V6-8, V10-11 of Lloyd Evans & Menzies (1973) who labelled them on an ID chart. The numbering system V1-9 was assigned by Sawyer Hogg (1973) in her 3rd catalogue. V10-12 Lloyd Evans & Menzies (1977) with an ID chart for V1-12 V13-26 Hazen & Hesser (1986) with x,y coordinates and an ID chart for V3-V26. (V1 and V2 were too close to the centre on their photographs.) Hazen & Hesser also discovered 4 field variables that they numbered F1-4. V27-29 Silbermann et al. (1994) with x,y coordinates and ID charts They also announced 4 suspected variables, three of which, S1-3, were later confirmed by Pritzl et al. (2002) and numbered V32, V49 and V53. Pritzl et al. were unable to find any variation in S4, but noted that crowding might have been an issue. However, no variation was detected by Corwin et al. when they applied the image subtraction technique to the observations. V30-57 Pritzl et al. (2002) with x,y in pixels and arcsec, and ID charts V58-69 Corwin et al. (2006) with x,y coordinates in arcsec These authors also published data for six "suspected" variables which they numbered SV1-SV6. V70-73 = SV1, SV2, SV4, SV5 of Corwin et al. (2006) The numbers V70-73 were assigned by Skottfelt et al. (2015) who confirmed their variability, derived RA and dec and published a finding chart. V74-121 Skottfelt et al. (2015) with RA, dec and a finding chart. ------------------------------------------------------------------------- Dalessandro et al. (2008) identified a substantial population of BS stars from HST observations, but they did not search for variability in their data. ================================================================== References Bellini, A., Piotto, G., Milone, A. P., King, I. R., Renzini, A., Cassisi, S., Anderson, J. and 3 coauthors, 2013, ApJ, 765, 32 Corwin, T. M., Sumerel, A. N., Pritzl, B., Smith., H. A., Catelan, M., Sweigart, A. V., Stetson, P. B. 2006, AJ 132, 1014 Dalessandro, E., Lanzoni, B., Ferrarro, F. R., Rood, R. T., Milone, A., Piotto, G., Valenti, E. 2008, ApJ, 677, 1069 Harris, W. E. 1996, AJ, 112, 1487 Hazen, M. L. & Hesser, B. H. 1986, AJ, 92, 1094 Lloyd Evans, T. & Menzies, J. W. 1973, IAU Colloq, 21, Variable Stars in Globular Clusters and in Related Systems, 151 Lloyd Evans, T. & Menzies, J. W. 1977, MNRAS, 178, 163 Pritzl, B. J., Smith, H. A., Catelan, M., Sweigart, A. V. 2002, AJ, 124, 949 Prudil Z., Arellano Ferro, A. 2024, MNRAS, 534, 3654 Sawyer Hogg, H. 1973, Publ. DDO, 3, No. 6 Shapley, H. & Swope, H. H. 1940, Harv. Ann., 90, 177 Silbermann, N. A., Smith, H. A., Bolte, M., Hazen, M. L. 1994, AJ, 107, 1764 Skottfelt, J., Bramich, D. M., Figuera Jaimes, R., Jorgensen, U. G., Kains, N., Arellano Ferro, A., Alsubai, K. A. and 27 coauthors, 2015, A&A, 573, A103 Sloan, G. C., Matsunaga, N., Matsuura, M., Zijlstra, A. A., Kraemer, K. E., Wood, P. R., Nieusma, J., Bernard-Salas, J., Devost, D., Houck, J. R. 2010, ApJ, 719, 1274 =====================================================================