NGC 7099 / C2137-234 / Messier 30 (Updated May 2010) RA: 21:40:22.12 DEC: -23:10:47.5 (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 21:40:24.25 -23:11:46.8 R0 0.7436 15.75 1.50 P RR0 2 21:40:26.44 -23:12:51.5 R0 0.6535 15.48 1.12 P RR0 3 21:40:15.04 -23:11:28.2 R0 0.6963 15.49 1.15 P RR0 4 21:39:58.44 -23:11:43.1 R0 ---- 16.5 2.8 V UG max;f;Note 5 21:40:16.20 -23:08:44.8 R0 ---- -- -- ? 6 21:40:19.22 -23:10:44.4 R0 ---- -- -- ? 7 21:40:18.68 -23:08:54.3 R0 ---- -- -- ? 8 21:40:21.25 -23:11:17.8 R0 ---- -- -- ? 9 21:40:21.72 -23:11:09.4 R0 ---- -- -- ? 10 21:40:21.93 -23:11:24.3 R0 ---- -- -- ? 11 21:40:25.64 -23:10:08.3 R0 ---- -- -- ? 12 21:40:27.88 -23:12:07.7 R0 ---- -- -- ? 13 21:40:21.09 -23:11:32.9 R0 ---- -- -- ? =================================================================== Supplementary Notes and References The RA and dec for V1-13 are from Samus et al. (2009, PASP 121, 1378). The magnitudes and periods for V1 are from Rosino (1961, Asiago-Padova Cont #117) and V2-3 from Rosino (1949, Mem. Soc. Italiana 16, 237) ====================================== Notes on individual stars V4: Rosino (1961, Asiago-Padova Cont 117)) commented that V4 was unlikely to be a cluster member and this conclusion was later confirmed by Machin et al. (1991, MNRAS 250, 602) and by Pietrukowicz et al (2008, MNRAS 388, 1111) who considered it to be a foreground star. These latter authors easily recovered this variable and plotted a light curve. The magnitudes listed in the above table were read from their light curve. ================================================================= Discovery of the variable stars in M30: V1-3 Bailey (1902, Harv Ann. 38) with x,y coordinates (page 244) and an ID chart (plate XII, Fig. 4, page 252.23) V4 Rosino (1949, Mem. Soc. Astron. Italiana 20, 63 = Bologna Publ. V, No.9) with an ID chart for V1-4. The x,y coordinates for V4 were later derived by Sawyer (1955) for her 2nd catalogue. V4 is NSV 25717 in the Moscow GCVS (Samus et al.) V5-12 (=Terzan's V1-8) Terzan (1968, Haute Prov Publ 9, No. 24) with an ID chart He classified these new variables as short period Cepheids. The numbers V5-V12 were assigned by Sawyer Hogg (1973) in her 3rd catalogue. V13 Terzan & Rutily (1975, A&A 38, 307) with ID chart and x,y coordinates. They also published x,y coordinates for V5-V12 and included V6,V8, V9 and V10 on the ID chart ======================================================================