NGC 6356 / C1720-177 (updated 2009) RA: 17:23:34.93 DEC: -17:48:46.9 (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 or P (for photographic). 61-65 A5 Type of variable (draft 2006 GCVS classifications) NV denotes not variable 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 -15 -24 XA 230.6 17.35 1.7 B M 2 101 -110 XA 17.6 0.8 B Lb 3 -24 45 XA 220.0 16.9 2.8 B M mem 4 187 47 XA 207.3 17.35 2.3 B M f? 5 -255 152 XA 219.8 17.55 1.9 B M 6 -575 114 XA 189.8 17.2 2.6 B M f? 7 -- -- ---- 15.5 0.2 V Lb 8 -- -- ---- 15.8 0.4 V Lb 9 -- -- ---- 15.6 0.4 V Lb 10 -- -- ---- 15.65 0.1 V Lb ================================================================== Supplementary Notes and References V1-6: Periods, magnitudes, amplitudes, variability types for V1-6 are from Clement & Sawyer Hogg, AJ 82, 968 (1977) Membership status for V3 from Feast (1972, QJRAS 13, 191), for V4 from Lloyd Evans & Menzies (1973) and V6 from Clement & Sawyer Hogg (1977) V7-10: Magnitudes and amplitudes for V7-10 are from Lloyd Evans & Menzies, MNRAS 178, 163 (1977). They classified these stars as red variables. Since the GCVS does not use this term, we have classified them as Lb. ================================================================ Discovery of the variable stars in NGC 6356: V1-5, F1=V6 Sawyer, JRASC 47, 229 (1953) with x,y positions and ID chart for V1-5 ID chart for V6 by Clement & Sawyer Hogg, AJ 82, 968 (1977) V7-10 Lloyd Evans & Menzies (1973, IAUC 21) who identify them as stars 34, 72, 30 and 46 of Sandage & Wallerstein (1960, ApJ 131, 598) Sandage & Wallerstein (1960) also included V1-5 on their ID charts ================================================================