NGC 6254 / C1654-040 / Messier 10 (Updated July 2017) RA: 16:57:09.05 DEC: -04:06:01.1 (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 16:57:10.12 -04:05:36.1 R0 50.0 13.8 1.5 P SR Note 2 16:57:11.74 -04:03:59.7 R0 18.7226 11.83 1.18 V CW Note 3 16:56:55.95 -04:04:16.3 R0 7.831 12.76 0.45 V CW Note 4 16:57:11.63 -04:10:37.9 R0 ---- -- -- RR? Note 5 16:57:08.59 -04:06:16.3 R0 0.058 16.875 0.267 i SXP 6 16:57:10.71 -04:05:33.3 R0 0.060 16.499 0.115 i SXP 7 16:57:10.35 -04:07:03.0 R0 0.048 17.251 0.051 i SXP 8 16:57:08.29 -04:05:10.0 R0 0.051 16.978 0.055 i SXP 9 16:57:10.65 -04:05:50.8 R0 0.051 17.040 0.414 i SXP? f?;Note 10 16:57:08.43 -04:06:54.7 R0 0.022 17.977 0.086 i SXP? Note 11 16:57:10.81 -04:05:55.9 R0 0.048 17.064 0.078 i SXP 12 16:57:04.04 -04:06:06.9 R0 0.023 17.091 0.020 i SXP 13 16:57:08.80 -04:06:24.5 R0 0.036 16.775 0.016 i SXP 14 16:57:09.20 -04:06:05.3 R0 0.038 17.449 0.066 i SXP 15 16:57:13.28 -04:05:48.7 R0 0.035 17.297 0.031 i SXP 16 16:57:06.21 -04:06:42.2 R0 ---- -- -- L? Note ====================================================================== Supplementary Notes The RA and dec for V1-4 are from Samus et al. (2009) All the data for V5-16 are from the discovery paper by Salinas et al. (2016). ============================================================================= Notes on individual stars V1: Period, magnitude, amplitude and variablility type for V1 by Clement et al. (1985) V2: Period from Clement et al. (1985), magnitude, amplitude and variablility type from Arp (1955a). V3: Period from Clement et al. (1985), magnitude, amplitude and variability type from Arp (1955a) V4: Variabiity type for V4 from Voroshilov (1971) V9: Salinas et al. (2016) found that the amplitude of light variations for V9 was higher than the other SX Phe variables in the cluster. They also noted that, in HST photometry, it was brighter than the blue stragglers of similar colour. This led them to conclude that V9 might be a foreground Delta Scuti variable, although its proximity to the cluster centre would indicate cluster membership. V10: Salinas et al. (2016) noted that their SX Phe classification for this star was uncertain because of its short main period. It could also be a HW Vir-type variable, a B subdwarf with a faint eclipsing companion. V16: This star, located on the subgiant branch of the CM diagram, showed a steady increase in brightness (~ 0.02 mag) throughout the 6.65 hour time span of the observations. Its properties might be similar to a group of variable K giants that Kaluzny et al. (1998) identified on the subgiant branch in 47 Tucanae. ================================================================== Discovery of the variable stars in M10: V1-2 Sawyer (1938) with ID chart and x,y coordinates V3 Arp (1955a) with ID chart for V2&3. Sawyer (1955) listed the x,y coords in her 2nd catalogue V4 = Arp IV-37 (see Arp 1955b) by Voroshilov (1971) who found that this was an HB star in the instability strip. The number V4 was assigned by Sawyer Hogg (1973) in her 3rd catalogue. V5-16 Salinas et al. (2016) with RA and dec (J2000) ----------------------------------------------------------------- Field variables not listed above M10:V1-3 by von Braun et al. (2002) vB#1 is a foreground WUMa, #2 is a background RR0 and #3 is a background SXPhe (or delta Scuti) ------------------------------------------------------------------- Pietrukowicz et al. (2008, MNRAS 388, 1111) searched for dwarf novae in M10 and found none. --------------------------------------------------------------------- Dalessandro et al. (2013) counted 120 blue straggler stars within the tidal radius of M10, but did not carry out a variability search. ----------------------------------------------------------------- Narloch et al. (2017) have derived proper motions and mambership probabilities for more than 24,000 stars in the field of M10. ===================================================================== References Arp, H. C. 1955a, AJ, 60, 1 Arp, H. C. 1955b, AJ, 60, 317 Clement, C. M., Hogg, H. S., Wells, T. R. 1985, AJ 90, 1238 Dalessandro, E., Ferraro, F. R., Lanzoni, B., Schiavon, R. P., O'Connell, R. W., Beccari, G. 2013, ApJ, 770, 45 Kaluzny, J., Kubiak, M., Szymanski, M., Udalski, A., Krzeminski, W., Mateo, M., Stanek, K. Z. 1998, A&AS, 128, 19 Narloch, W., Kaluzny, J., Poleski, R., Rozyczka, M., Pych, W., Thompson, I. B. 2017, arXiv:1706.09612v2 (submitted to MNRAS) Pietrukowicz, P., Kaluzny, J., Schwarzenberg-Czerny, A., Thompson, I. B., Pych, W., Krzeminski, W., Mazur, B. 2008, MNRAS, 388, 1111 Samus, N. N., Kazarovets, E. V., Pastukhova, E. N., Tsvetkova, T. M., Durlevich, O. V. 2009, PASP, 121, 1378 Salinas, R., Contreras Ramos, R., Strader, J., Hakala, P., Catelan, M., Peacock, M. B., Simunovic, M. 2016, AJ, 152, 55 Sawyer, H. B. 1938, Publ. DAO, 7, no.5 Sawyer, H. B. 1955, Publ. DDO, 2, No. 2 Sawyer Hogg, H. 1973, Publ. DDO, 3, No. 6 von Braun, K., Mateo, M., Chiboucas, K., Athey, A., Hurley-Keller, D. 2002, AJ, 124, 2067 Voroshilov, Yu. V. 1971, Astron. 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