Tonantzintla 2 / Pismis 26 / C1733-390 (Updated April 2014) RA: 17:36:10.5 DEC: -38:33:12 (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 17:36:17.03 -38:32:22.6 R0 ---- -- -- 2 17:36:17.46 -38:32:34.2 R0 ---- -- -- ==================================================================== Supplementary Notes VI photometry by Bica et al. (1996) shows the colour-magnitude diagram has a red HB and indicates that the cluster is metal rich, [Fe/H] = ~-0.6. Their photometry extended to the main sequece turn-off region and showed a blue straggler population. However, they did not carry out a variable star search and did not discuss the known variable stars. ============================================================ Discovery of the Variable Stars in Tonantzintla 2: V1-2 Fourcade et al. (1966) with x,y positions and ID chart The RA and dec were derived by Samus et al. (2009) who commented that V2 is very red. ===================================================================== References Bica, E., Ortolani, S., Barbuy, B. 1996, A&AS, 120, 153 Fourcade, C. R., Laborde, J. R., Albarracin, J. 1966, Atlas y Catalogue de Estrellas Variables en Cumulos Globulares al sur de -29 degrees, Cordoba Samus, N. N., Kazarovets, E. V., Pastukhova, E. N., Tsvetkova, T. M., Durlevich, O. V. 2009, PASP, 121, 1378 =======================================================================