NGC 6717 / Palomar 9 / C1852-227 (Updated July 2014) RA: 18:55:06.04 DEC: -22:42:05.3 (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 18:55:06.16 -22:41:47.7 R0 0.5752 15.75 1.3 B RR0 ======================================================================= Supplementary Notes BV colour magnitude diagrams by Brocato et al. (1996) and Ortolani et al. (1999) show an extended blue HB which is unusual for a cluster with such a relatively high metal abundance. According to the 2010 version of the Harris catalogue, [Fe/H] = -1.26. The period, mean magnitude, amplitude and variability type listed for V1 are from Goranskij (1978) and the RA and dec are from Samus et al. (2009). Based on its location in the CM diagram, it is considered to be a cluster member. ========================================================================= Discovery of the variable stars in NGC 6717 V1 = SPZ 2200 Goranskij (1978) with x,y position and ID chart An ID chart for SPZ 2200 was also published by Goranskij (1979) The number V1 was assigned by Clement et al. (2001). Another (suspected) RR Lyrae (based on its position in the CM diagram) was announced by Gerashchenko et al. (1997) On their ID chart, the star is located at pixel position: X~72, Y~453. ============================================================================= References Brocato, E., Buonanno, R., Malakhova, Y., Piersimoni, A. M. 1996,A&A, 311, 778 Clement, C. M., Muzzin, A., Dufton, Q., Ponnampalam, T., Wang, J., Burford, J., Richardson, A., Rosebery, T. 2001, AJ, 122, 2587 Gerashchenko, A. N., Kadla, Z. I., Malakhova, Yu. N. 1997, IBVS, 4446 Goranskij, V. P. 1978, Per. Zvez., 20, 555 Goranskij, V. P. 1979, Sov. Ast., 23, 284 Harris, W. E. 1996, AJ, 112, 1487 Ortolani, S., Barbuy, B., Bica, E. 1999, A&AS, 136, 237 Samus, N. N., Kazarovets, E. V., Pastukhova, E. N., Tsvetkova, T. M., Durlevich, O. V. 2009, PASP, 121, 1378 ==========================================================================