Terzan 10 / C1800-260 (Updated December 2015) RA: 18:02:57.4 DEC: -26:04:00 (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, 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 Period ampl C Type Notes/ RA/X Dec/Y Units Remarks ========================================================================= 1 18:02:58.87 -26:03:35.2 R0 3.8798 14.072 0.402 K E 2 18:02:59.48 -26:04:22.5 R0 0.7305 14.608 0.364 K RR0 3 18:02:54.05 -26:03:46.9 R0 0.7017 14.759 0.323 K RR0 4 18:03:00.19 -26:05:05.8 R0 0.6845 14.545 0.238 K E f 5 18:02:57.14 -26:02:43.9 R0 0.6885 14.889 0.294 K RR0 6 18:02:56.90 -26:05:19.6 R0 0.5823 14.875 0.322 K RR0 7 18:02:53.23 -26:05:12.7 R0 0.7153 14.711 0.33 K RR0 8 18:03:03.84 -26:03:13.4 R0 1.0653 16.779 0.295 K ? f? 9 18:02:51.23 -26:05:14.8 R0 0.1938 16.091 0.259 K ? f? 10 18:03:04.64 -26:05:15.4 R0 0.2113 16.203 0.41 K ? f? 11 18:02:56.47 -26:06:08.6 R0 0.4203 15.845 0.285 K ? f? 12 18:03:04.08 -26:05:33.6 R0 0.5687 14.455 0.286 K RR0 f? 13 18:03:05.48 -26:02:45.9 R0 0.2659 15.803 0.265 K ? f? 14 18:02:47.12 -26:03:01.3 R0 3.7122 14.339 0.116 K CW? f;Note 15 18:03:00.04 -26:01:28.4 R0 0.2095 16.385 0.394 K ? f? 16 18:03:00.44 -26:06:31.6 R0 4.0794 13.529 0.08 K CW f;Note 17 18:02:51.56 -26:01:41.4 R0 4.3325 12.468 0.063 K CW f;Note 18 18:03:01.83 -26:01:32.2 R0 2.0970 14.493 0.117 K CW? f;Note 19 18:02:48.90 -26:05:58.7 R0 4.6044 15.58 0.237 K CW? f;Note 20 18:02:52.16 -26:01:27.0 R0 2.5430 15.137 0.441 K E 21 18:03:06.35 -26:01:57.1 R0 0.2600 16.28 0.261 K ? f? 22 18:03:01.41 -26:06:48.0 R0 0.6186 14.811 0.297 K RR0 23 18:02:45.40 -26:05:26.7 R0 0.5338 14.926 0.365 K E f 24 18:02:46.97 -26:06:09.1 R0 0.5922 14.877 0.327 K RR0 25 18:02:45.09 -26:05:56.3 R0 0.4657 15.817 0.21 K ? f? 26 18:03:11.45 -26:05:15.9 R0 0.1466 15.262 0.287 K ? f? 27 18:03:12.51 -26:04:15.6 R0 0.2792 14.201 0.266 K ? f? 28 18:03:08.88 -26:06:17.3 R0 0.2355 14.536 0.544 K ? f? 29 18:02:54.27 -26:00:23.2 R0 0.5578 12.614 0.059 K ? f? 30 18:02:43.44 -26:02:01.2 R0 0.1665 14.352 0.113 K ? f? 31 18:02:45.00 -26:01:21.4 R0 46.83 13.620 0.052 K CW? f;Note 32 18:03:13.94 -26:05:02.3 R0 4.2824 14.923 0.802 K E 33 18:03:03.00 -26:07:43.2 R0 0.3954 15.338 0.208 K ? f? 34 18:03:14.09 -26:02:45.2 R0 0.3999 13.184 0.18 K ? f? 35 18:03:11.73 -26:01:42.8 R0 0.1362 16.345 0.419 K ? f? 36 18:03:02.63 -26:07:46.2 R0 0.3735 16.067 0.374 K ? f? 37 18:03:15.02 -26:03:51.3 R0 68.95 14.711 0.081 K ? f? 38 18:03:00.55 -26:07:58.8 R0 0.2058 15.552 0.139 K ? f? 39 18:02:38.76 -26:04:19.5 R0 75.6 15.012 0.115 K CW? f;Note 40 18:02:41.46 -26:06:22.5 R0 0.2659 12.898 0.304 K ? f? 41 18:02:38.91 -26:02:31.3 R0 8.349 14.595 0.659 K E 42 18:02:37.32 -26:03:40.5 R0 0.2914 15.151 0.181 K ? f? 43 18:02:39.24 -26:06:01.7 R0 0.3895 15.0 0.24 K ? f? 44 18:02:56.94 -26:08:36.8 R0 0.4332 15.785 0.281 K ? f? 45 18:02:39.68 -26:06:23.5 R0 2.9760 14.991 0.244 K E 46 18:03:16.08 -26:01:55.4 R0 0.2223 14.152 0.233 K ? f? 47 18:03:18.34 -26:03:59.5 R0 65.27 14.327 0.129 K CW? f;Note 48 18:02:49.72 -25:59:21.4 R0 ---- -- -- K L Note 49 18:02:56.77 -26:03:45.7 R0 0.5895 18.517 0.278 I RR0 50 18:02:57.94 -26:04:06.7 R0 0.6032 18.108 0.501 I RR0 51 18:02:59.07 -26:02:36.4 R0 0.7558 18.319 0.375 I RR0 52 18:03:05.19 -26:04:36.2 R0 0.3275 18.218 0.260 I RR1 ======================================================================== Supplementary Notes Terzan 10 is a heavily reddened cluster in the Galactic bulge. * The RA and dec listed for the cluster centre are from the 2003 version of the Harris (1996) catalogue. According to Alonso-Garcia et al. (2015), they are more accurate than the values Harris listed in 2010. Alonso-Garcia et al. (2015) published a K,J-K CM diagram but found that it was difficult to disentangle cluster stars from stars in the Galactic disk and bulge. Contamination by these field stars is significant, even at distances smaller than the half light radius (1.55 arcminutes). The data for V1-48 are from the discovery paper by Alonso-Garcia et al. (2015). These are the variables that lie within the tidal radius, 5.06 arcminutes, but many of them are probably field stars. In fact, Alonso-Garcia et al. concluded that the vast majority of the unclassified variables are disk field variables, based on their positions in the CM diagram. ========================================================================= Notes on individual stars V14, V16, V17, V18, V19, V31, V39, V47; Alonso-Garcia et al. (2015) concluded that most of the Cepheids are too faint to be cluster members, based on the period luminosity relations derived by Matsunaga et al. (2013) for type I and II Cepheids. The only exception is V17 which appears to be a type II Cepheid in the cluster foreground in the Galactic bulge. V48: Alonso-Garcia et al. (2015) derived a mean K magnitude of 13.2 and K amplitude of 0.2 mag, but noted that these parameters should be considered with caution because the light curve was not well defined yet. Their observations indicated that the period must be more than 500 days. ======================================================================= Discovery of the variable stars in Terzan 10 V1-48 = NV1-NV48 Alonso-Garcia et al. (2015) with RA, dec and an ID chart These variables all lie inside the tidal radius which is 5.06 arcminutes according to the 2010 update to the Harris (1996) catalogue. In their investigation, Alonso-Garcia et al. discovered an additional 112 variables outside the tidal radius. They numbered them NV49 to NV160 and considered them all to be field variables. V49-52 = OGLE_BLG_RRLYR-33518, OGLE_BLG_RRLYR-33521, OGLE_BLG_RRLYR-33525, OGLE_BLG_RRLYR-33542 These 4 variables and their RA and dec were announced in the OGLE-IV survey (Soszynski et al. 2014). They all lie within 5 arcminutes of the centre of Terzan 10. An additional RR1 variable, OGLE_BLG_RRLYR-33551 is located 3.24 arcminutes from the cluster centre, but appears too bright (I=17.499) to be a cluster member. In their survey, Soszynski et al. 2014 also recovered all (except V5) of the RR Lyrae variables announced by Alonso-Garcia et al. (2015). ======================================================================= References Alonso-Garcia J., Dekany I., Catelan M., Contreras Ramos R., Gran F., Amigo P., Leyton P., Minniti D. 2015, AJ, 149, 99 Matsunaga, N., Feast, M. W., Kawadu, T., Nishiyama, S., Nagayama, T., Nagata, T., Tamura, M. and 2 coauthors, 2013, MNRAS, 429, 385 Soszynski, I., Udalski, A., Szymanski, M. K., Pietrukowicz, P., Mroz, P., Skowron, J., Kozlowski, S. and 6 coauthors, 2014, Ac. A. 64, 177 ========================================================================