C2143-214 / Palomar 12 (Updated September 2014) RA: 21:46:38.84 DEC: -21:15:09.4 (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 21:46:35.21 -21 12 56.0 R0 ---- 20.7 0.8 B RR? f 2 21:46:32.42 -21 12 50.0 R0 ---- 20.9 1.2 B RR? f 3 21:46:31.2 -21 13 27 R0 ---- 18.5 -- B SN? max,f ===================================================================== Supplementary Notes The RA and dec for V1-3 are from Samus et al. (2009). V1-V2: The magnitudes, amplitudes and variability types for V1&2 are from Kinman & Rosino (1962). The membership status is from Rosino & Ortolani (1985) based on the CM diagram published by Harris & Canterna (1980) V3: The magnitude for V3 is from Kinman & Rosino (1962) and the possibility that this object was a supernova in a faint galaxy was suggested by Rosino & Ortolani (1985). None of these variables were detected in a search for RR Lyrae variables by Salinas et al. (2005). Thus their variability is questioned. ===================================================================== Discovery of the variable stars in Pal 12: V1-3 Kinman & Rosino (1962 - see page 503) with x,y positions and ID chart. They pointed out that V1 had been previously announced by Zwicky (1957). Palomar 12 was known as Abell 12 when Kinman & Rosino conducted their survey. ------------------------------------------------------------------- Lynch & Ransom (2011) conducted a search for pulsars, using the Green Bank telescope. None were identified in Palomar 12. ------------------------------------------------------------------ Salinas et al. (2012) identified a number of blue stragglers in Pal 12, based on BV photometry, but no variable star search was carried out. ========================================================================== References Harris, W. E. & Canterna, R. 1980, ApJ, 239, 815 Kinman, T. D. & Rosino, L. 1962, PASP 74, 499 Lynch, R. S. & Ransom, S. M. 2011, ApJ, 730, L11 Rosino, L. & Ortolani, S. 1985, Mem S. A. I., 56, 113 Salinas, R., Catelan, M., Smith, H. A., Pritzl, B. J., Borissova, J. 2005, IBVS, 5640 Salinas, R., Jilkova, L., Carraro, G., Catelan, M., Amigo, P. 2012, MNRAS, 421, 960 Samus, N. N., Kazarovets, E. V., Pastukhova, E. N., Tsvetkova, T. M., Durlevich, O. V. 2009, PASP, 121, 1378 Zwicky, F. 1957, Morphological Astronomy (Berlin: Springer), p.205 =====================================================================