NGC 7089 / C2130-010 / Messier 2 (Updated 2009) RA: 21:33:27.02 DEC: -00:49:23.7 (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 variabillity) 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 (e.g. f denotes field star; Bl indicates Blazhko effect)) "--" or "----" indicates no data available ========================================================================= ID Position Period ampl C Type Notes/ RA/X Dec/Y Units Remarks ========================================================================= 1 25.6 79.4 XA 15.5647 13.36 1.1 V CW 1 2 -45.8 71.1 XA 0.5278 16.031 1.210 V RR0 2;Bl 3 222.9 -39.6 XA 0.6197 15.963 1.062 V RR0 2 4 -26.8 31.5 XA 0.5642 15.929 1.025 V RR0 2 5 -44.4 2.1 XA 17.557 13.28 0.85 V CW 1 6 11.8 -45.4 XA 19.299 13.14 1.0 V CW 1 7 153 -189.2 XA 0.5949 15.962 1.042 V RR0 2 8 -66.9 -56.8 XA 0.6437 15.946 0.981 V RR0 2 9 -173.2 -128.2 XA 0.6093 16.001 1.038 V RR0 2 10 90.6 38.8 XA 0.8757 15.733 0.634 V RR0 2 11 85 8 XA 67.0 12.11 1.1 V RV 1 12 -62 43 XA 0.6656 15.909 1.007 V RR0 2 13 -77 73 XA 0.7066 15.921 0.839 V RR0 2 14 83 -68 XA 0.6938 15.969 0.759 V RR0 2;Bl 15 80 -76 XA 0.3008 16.077 0.456 V RR1 2 16 -31 -27 XA 0.6559 16.013 1.012 V RR0 2;Bl 17 2 -63 XA 0.6364 15.863 1.202 V RR0 2 18 -189 -707 XA 0.3621 15.951 0.624 V RR1 2 19 235 -502 XA 0.3194 16.048 0.558 V RR1 2 20 400 74 XA 0.2863 16.065 0.376 V RR1 2 21 315 208 XA 0.7122 15.970 0.831 V RR0 2 22 0.2 40.7 XA 0.7020 15.749 1.004 V RR0 2;Bl? 23 84.7 -48.5 XA 0.7812 15.908 0.537 V RR0 2 24 -45.8 -109.5 XA 0.3582 15.992 0.457 V RR1 2 25 1.1 -41.2 XA 0.7287 16.075 0.877 V RR0 2;Bl 26 71 -8.1 XA 0.4124 15.922 0.482 V RR1 Note 27 -53.3 119.8 XA 0.3142 15.947 0.121 V RR1 2 28 8.3 97.8 XA 0.8238 15.942 0.183 V RR0 2 29 -64.7 -96.4 XA 0.3058 16.020 0.182 V RR1 2 30 90.9 42.8 XA 0.2729 16.118 0.223 V RR1 2 31 50.9 -4.1 XA 0.7887 16.066 0.553 V RR0 2 32 53.1 -43.1 XA 0.3670 16.038 0.612 V RR1 Note 33 -50.2 -19.8 XA 0.3080 15.931 0.515 V RR1 2 34 67 -41.9 XA 0.3914 15.975 0.523 V RR1 2 35 21:33:28.00 -0:47:31 R0 0.3256 -- -- RR1 36 21:33:30.70 -0:49:12 R0 0.2708 -- -- RR1 37 21:33:26.00 -0:49:18 R0 0.5667 -- -- RR0 38 21:33:31.10 -0:49:23 R0 0.8073 -- -- RR0 39 21:33:27.30 -0:50:06 R0 0.6078 -- -- RR0 40 21:33:25.60 -0:49:15 R0 0.7517 -- -- RR0 41 21:33:28.00 -0:49:24 R0 0.6053 -- -- RR0 42 21:33:28.30 -0:49:51 R0 0.3280 -- -- RR1 =================================================================== Supplementary Notes and References For V1-34: Periods, magnitudes, amplitudes and variability types are from Lee & Carney, (1999, AJ 117, 2868) unless indicated otherwise in the notes on individual stars. For V35-V42: All the data are from Lazaro et al. (2006, MNRAS 372, 69). No magnitudes were derived because they used the image subtraction technique to analyse their observations. ============ Notes on individual stars V1, V5, V6, V11: Periods, magnitudes, amplitudes and variability types are from Demers (1969, AJ 74, 925). For V11, the RV Tauri variable, he plotted the light curve with the half period (33.5 days). V26, V32: Periods are from Lazaro et al. (2006, MNRAS 372, 69) and magnitudes, amplitudes and variability types are from Lee & Carney, (1999, AJ 117, 2868) ================================================================= Discovery of the variable stars in M2: V1-10 Bailey (1902, Harvard Annals 38) with x,y positions (p 244) and ID chart (Plate XII, Fig. 3) V11 announced by Chevremont (1897, Bul. Soc. Astr. France Vol. 11, p485) with ID chart (1898, Bul. Soc. Astr. France Vol. 12, p90). This star was designated V11 by Sawyer (1935, Pub DAO, 6) V12-17 Sawyer (1935, Pub DAO 6 No.14) with ID chart for V1-17 and x,y positions for V11-17 listed (1938, Pub DAO 7, No. 5) V18-21 Margoni & Stagni (1967, IBVS 239) with x,y positions and (1969, Mem. Soc. Ast. It. 40, 143) with ID chart V22-34 Lee & Carney (1999, AJ 117, 2868) with ID chart. V22-34 = LC 184, 301, 450, 456, 608, 651, 708, 715, 733, 798, 864, 939, 1047 respectively The x,y positions listed for these stars were computed by Adam Muzzin in 2001 based on pixel positions received in correspondence with Lee. V35-42 Lazaro et al. (2006, MNRAS 372, 69) with RA, dec and ID chart ======================================================================