NGC 6235 / C1650-220 (Updated March 2013) RA: 16:53:25.31 -22:10:38.8 (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 16:53:24.28 -22:09:59.7 R0 0.6160 17.03 1.4 B RR0 2 16:53:29.50 -22:14:11.0 R0 0.5838 17.31 1.5 B RR0 3 16:53:02.56 -22:05:19.8 R0 ---- 16.58 0.6 B ? f;V2249 Oph 4 16:53:36.18 -22:14:18.9 R0 1.6209 15.78 0.8 B EA max;V2250 Oph 5 16:53:29.45 -22:12:08.9 R0 0.3519 17.30 0.7 B RR1 altP=0.2602 ======================================================================== Supplementary Notes The periods, amplitudes and classifications for V1-5 are from Liller's (1977) photographic investigation and the B magnitudes are derived from Liller's (1980) revised calibration of the magnitudes. The RA and dec are from Samus et al. (2009). Howland et al. (2003) published a CCD CM diagram which showed a predominantly blue HB. They pointed out that the cluster is in the Ophiuchus-Scorpius region and therefore subject to differential reddening. ======================================================================= Notes on individual stars V3: This star has two possible periods: 0.14188 or 0.16541 days. Its classification is uncertain. It could be a close binary or an SX Phe and is not considered to be a cluster member. ======================================================================= Discovery of the variable stars in NGC 6235 V1-2 Sawyer (1953) with x,y coordinates and an ID chart V3-5 Liller (1977) with x,y coordinates and an ID chart ====================================================================== References Howland, R., Sarajedini, A., Tiede, G. P., Gokas, T., Djagalov, R., Martins, D. H. 2003, AJ, 125, 801 Liller, M. H. 1977, AJ, 82, 711 Liller, M. H. 1980, AJ, 85, 673 Samus, N. N., Kazarovets, E. V., Pastukhova, E. N., Tsvetkova, T. M., Durlevich, O. V. 2009, PASP, 121, 1378 Sawyer, H. B. 1953, JRASC 47, 229 ==========================================================================