NGC 6453 / C1748-346 (Updated April 2016) RA: 17:50:51.70 DEC: -34:35:57.0 (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 17:50:52.12 -34:36:04.6 R0 31.0476 12.768 0.842 I RVT r=0.15 2 17:50:53.03 -34:35:09.4 R0 27.1954 12.375 0.865 I RVT r=0.84 3 17:50:51.89 -34:35:36.3 R0 0.3559 16.368 0.276 I RR1 r=0.35' 4 17:50:49.35 -34:34:31.7 R0 0.7354 16.235 0.526 I RR0 r=1.5 5 17:50:43.42 -34:36:15.0 R0 0.3869 15.640 0.237 I RR1 f?;r=1.7 6 17:50:47.43 -34:36:53.7 R0 0.2838 16.353 0.303 I RR1 r=1.3 7 17:50:49.62 -34:35:27.3 R0 0.3329 16.473 0.171 I RR1 r=0.65 8 17:51:00.00 -34:35:03.4 R0 0.7301 15.987 0.549 I RR0 r=1.9 9 17:50:50.41 -34:36:04.6 R0 0.3289 16.438 0.196 I RR1 r=0.3 10 17:50:51.90 -34:35:45.1 R0 0.7153 16.117 0.505 I RR0 r=0.2 11 17:50:52.65 -34:35:53.8 R0 0.3980 16.226 0.214 I RR1 r=0.2 12 17:50:58.21 -34:35:13.9 R0 0.4172 17.069 0.256 I RR1 f?;r=1.5 ======================================================================== Supplementary Notes This cluster is located in a rich field in the Galactic bulge. A VI CM diagram by Ortolani et al. (1999) shows a blue HB. A JK CM diagram by Valenti et al. (2010) shows a blue steep RGB with no evidence of a red HB, indicating a low-intermediate metallicity. Harris (1996) listed [Fe/H] = -1.50 in the 2010 update of his catalogue. The data for all the RR Lyrae variables listed in the above table are from the OGLE IV database (Soszynski et al. 2014). These are the only RR Lyrae variables located within 3.8 arcminutes of the cluster centre, the radius they listed for the cluster. They estimated that 2 of them might be field stars, and based on the mean magnitudes, it appears that V3 and V10 are field stars. The data for the RV Tauri variables are from the OGLE III catalogue (Soszynski et al. 2011b). Fourcade et al. (1966) observed NGC 6453 to search for variables, but did not find any. ======================================================================= Discovery of the variable stars in NGC 6453 V1-2 Matsunaga et al. (2006) with RA and dec V1 is also OGLE-BLG-T2CEP-342 and V2 is OGLE-BLG-T2CEP-102 = V0708 Sco of Soszynski et al. (2011b) in the OGLE III Catalogue of Type II Cepheids in the Galactic Bulge Soszynski et al. (2011b) identified another RV Tauri star and a Type II Cepheid, located at distances of 11.7 and 15.0 arcminutes respectively, from the cluster centre, within the tidal radius, 15.8 arcminutes. V3-4 = OGLE-BLG-RRLYR-04365 (NGC6453 V1) and OGLE-BLG-RRLYR-04337 (NGC6453 V2) of Soszynski et al. (2011a) in the OGLE III Catalogue of RR Lyrae variables in the Galactic Bulge The numbers V3-4 have been assigned in this catalogue. V5-12 = OGLE-BLG-RRLYR-04284, OGLE-BLG-RRLYR-04326, OGLE-BLG-RRLYR-04341, OGLE-BLG-RRLYR-04458, OGLE-BLG-RRLYR-30442, OGLE-BLG-RRLYR-30454, OGLE-BLG-RRLYR-30460, OGLE-BLG-RRLYR-30506 of Soszynski et al. (2014) from the their study of RR Lyrae variables in the Galactic bulge. The numbers V5-12 have been assigned in this catalogue. Soszynski et al. (2014) identified 39 additional RR Lyrae variables that are located beyond 3.8 arcminutes from the cluster centre and inside the tidal radius, 15.8 arcminutes. -------------------------------------------------------------------- The OGLE III catalogue (Soszynski et al. 2013) also includes approximately 50 Long Period variables in the vicinity of the cluster. Many of them seem too faint, but some might be associated with the cluster. -------------------------------------------------------------------- According to the VizieR Service, many of the variables are also listed in the catalogue of VISTA Variables in the Via Lactea Survey DR1 (Minniti et al. 2014), but no periods have been published by the VISTA group. ====================================================================== References Fourcade, C. R., Laborde, J. R., Albarracin, J. 1966, Atlas y Catalogue de Estrellas Variables en Cumulos Globulares al sur de -29 degrees, Cordoba Harris, W. E. 1996, AJ, 112, 1487 Matsunaga, N., Fukushi, H., Nakada, Y., Tanabe, T., Feast, M. W., Menzies, J. W., Ita, Y. and 7 coauthors, 2006, MNRAS, 370, 1979 Minniti, D., Saito, R. K., Hempel, M., Lucas, P. W., Rejkuba, M., Toledo, I., Gonzalez, O. A. and 102 coauthors, 2014, "The VVV Survey: New Results (Part I)" in Formation and Evolution of the Galactic Bulge Conference Proceedings, 1 Ortolani, S., Bica, E., Barbuy, B. 1999, A&AS, 138, 267 Soszynski, I., Dziembowski, W. A., Udalski, A., Poleski, R., Szymanski, M. K., Kubiak, M., Pietrzynski, G. and 4 coauthors, 2011a, Ac. A., 61, 1 Soszynski, I., Udalski, A., Pietrukowicz, P., Szymanski, M. K., Kubiak, M., Pietrzynski, G. , Wyrzykowski, L. and 3 coauthors, 2011b, Ac. A., 61, 285 Soszynski, I., Udalski, A., Szymanski, M. K., Kubiak, M., Pietrzynski, G., Wyrzykowski, L., Ulaczyk, R. and 4 coauthors, 2013, Ac. A. 63, 21 Soszynski, I., Udalski, A., Szymanski, M. K., Pietrukowicz, P., Mroz, P., Skowron, J., Kozlowski, S. and 6 coauthors, 2014, Ac. A. 64, 177 Valenti, E., Ferraro, F. R., Origlia, L. 2010, MNRAS, 402, 1729 =======================================================================