NGC 6171 / C1629-129 / Messier 107 (Updated 2009) RA: 16:32:31.9 DEC: -13:03:13 (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; Bl indicates the star exhibits the Blazhko effect.) "--" or "----" indicates no data available ========================================================================= ID Position Period ampl C Type Notes/ RA/X Dec/Y Units Remarks ========================================================================= 1 -112.8 -522 XA 332.0 15.500 3.0 P M f;Note 2 148.8 -388.8 XA 0.5710 15.637 0.783 V RR0 Dkns 3 -224.4 -183.6 XA 0.5663 15.430 0.524 V RR0 Dkns 4 -99.6 -156.6 XA 0.2821 15.535 0.463 V RR1 5 231 -161.4 XA 0.7024 15.522 0.460 V RR0 Dkns 6 -10.8 -67.2 XA 0.2603 15.654 0.521 V RR1 7 42 -61.2 XA 0.4975 15.789 0.868 V RR0 8 12 -42 XA 0.5599 15.607 1.090 V RR0 9 -26.4 -19.8 XA 0.3206 15.640 0.467 V RR1 10 -57 8.4 XA 0.4155 15.773 1.142 V RR0 11 9.6 33 XA 0.5928 15.553 0.620 V RR0 Dkns 12 58.8 61.2 XA 0.4729 15.718 0.735 V RR0 13 -27 72 XA 0.4668 15.767 1.272 V RR0 Dkns 14 17.4 82.2 XA 0.4816 15.704 1.284 V RR0 15 19.2 120 XA 0.2886 15.615 0.451 V RR1 16 -67.2 113.4 XA 0.5228 15.676 0.733 V RR0 Dkns 17 -99 71.4 XA 0.5612 15.614 1.063 V RR0 18 77.5 215.4 XA 0.5644 15.746 0.852 V RR0 19 232.8 162.6 XA 0.2788 15.755 0.478 V RR1 20 31.2 51 XA 0.5781 15.750 0.806 V RR0 21 81 -144.6 XA 0.2583 16.606 0.460 V RR1 f;Note 22 -1354.2 -183 XA ---- -- -- f;Note 23 -263.4 19.2 XA 0.3233 15.616 0.402 V RR1 24 0 8.4 XA 0.5240 15.807 1.001 V RR0 25 -- -- ---- 12.9 0.4 V Lb: Note ===================================================================== Supplementary Notes and References Periods, magnitudes and variability types are from Clement & Shelton (1997, AJ 113, 1711) unless designated "Dkns" in the remarks column (see V2, V3, V5, V11, V13, V16). For these stars, this information is from Dickens (1970, ApJ Supp. 22, 249). Cudworth et al. (1992, AJ 103, 1252) derived membership probabilities for stars in NGC 6171 ============== Notes on individual stars V1: V1 = V720 Oph Period, magnitude and classification by Coutts & Sawyer Hogg, (1971, Publ. DDO 3, 2). A radial velocty spectrum by Feast (private communication to Sawyer Hogg) demonstrated that V1 is not a cluster member. NB: The star Dickens (1970, ApJ Suppl. 22, 249) listed as V1 is V23 in the above table. V21: The "f" status for V21 was assigned by Dickens (1970, ApJ Supp. 22, 249) V22: Oosterhoff (1938) did not list any magnitudes for V22, but he commented that it was fainter than the other variables. It was located near the edge of his plates and not in the field of the finder chart he published. Sawyer Hogg (1973, DDO Publ. 3, No. 6) classified it as a probable field star because it is outside the tidal radius.. V25: Magnitude and amplitude from Lloyd Evans & Menzies MNRAS 178, 163 (1977). They classified V25 as a red variable, but we have classified it as Lb because the GCVS does not use the term, red variable. =============================================================== Discovery of the variable stars in NGC 6171: V1-24 Oosterhoff, BAN 8, 273 (1938) with x,y positions and ID chart V25 Lloyd Evans & Menzies, IAU Coll 21, 151 (1973) V25 is star 217 in the insert to Fig 1 of Sandage & Katem (1964, ApJ 139, 1088) =======================================================================