NGC 6528 / C1801-300 (Updated January 2015) RA: 18:04:49.64 DEC: -30:03:22.6 (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, 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 18:04:49.38 -30:03:27.2 R0 0.2559 15.61 0.19 I RR1 2 18:04:49.36 -30:03:19.5 R0 ---- 16.18 0.14 I RR0? Note 3 18:04:49.51 -30:03:26.7 R0 128.37 12.399 0.154 I SR Ogle 4 18:04:49.61 -30:03:38.2 R0 46.13 12.419 0.044 I SR? Ogle 5 18:04:50.01 -30:03:20.9 R0 ---- 12.70 0.10 I L 6 18:04:49.09 -30:03:17.6 R0 ---- 12.66 0.06 I L 7 18:04:49.36 -30:03:28.5 R0 ---- 19.6 -- I E? ======================================================================= Supplementary Notes NGC 6528 is a metal rich cluster that is located in a rich field in the Galactic bulge. Harris (1996) lists [Fe/H] = -0.11 in the 2010 update to his catalogue. A CM diagram by Lagoia et al. (2014) shows a prominent red HB. The data in the above table are from Skottfelt et al. (2015) unless indicated "Ogle" in the Remarks column. For the Ogle stars, the period, magnitude, amplitude and classification are from Soszynski et al. (2013). ======================================================================= Notes on individual stars V2: Skottfelt et al. (2015) derived a tentative period of 0.8165 for this star, but noted that the light curve was "noisy". =============================================================== Discovery of the variable stars in NGC 6528: V1-7 Skottfelt et al. (2015) with RA, dec and a finding chart V3 and V4 (Ogle #13921 and #13923 respectively) were independently discovered by Soszynski et al. (2013) in the Ogle III investigation of long period variables in the Galactic Bulge. ============================================================== References Harris, W. E. 1996, AJ, 112, 1487 Lagoia, E. P., Milone, A. P., Bono, G., Stetson, P. B., Prada Moroni, P. G., Dall'Ora, M., Aparicio, A. and 8 coauthors, 2014, ApJ, 782, 50 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 Soszynski, I., Udalksi, A., Szymanski, M. K., Kubiak, M., Pietrzynski, G., Wyrzykowski, L., Ulaczyk, K. and 3 coauthors, 2013, Acta A., 63, 21 ====================================================================