NGC 7492 / C2305-159 (Updated October 2014) RA: 23:08:26.63 DEC: -15:36:41.4 (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 23:08:26.68 -15:34:58.5 R0 0.8050 17.303 0.511 V RR0 2 23:08:25.00 -15:35:52.9 R0 0.4118 17.256 0.251 V RR1 3 23:08:29.33 -15:41:46.8 R0 0.2710 17.59 0.4 B RR1 4 23:08:23.19 -15:39:06.0 R0 21.7 14.271 0.18 V L 5 23:08:39.08 -15:34:36.3 R0 ---- 14.258 -- V L amp>0.33 6 23:08:29.16 -15:36:51.1 R0 0.0566 19.235 0.136 V SXPHE 7 23:08:19.83 -15:37:33.6 R0 0.0726 19.363 0.050 V SXPHE ====================================================================== Supplementary Notes All the data for V1-2 and V4-7 are from Figuera Jaimes et al. (2013). V3 was outside their field. For V3, the RA and dec are from Samus et al. (2009) and the remaining data are from the discovery paper by Barnes (1968). The CM diagram (VR) by Figuera Jaimes et al. (2013) shows a well populated blue HB. ===================================================================== Discovery of the variable stars in NGC 7492: V1 Shapley (1920) with x,y coordinates and an ID chart He also announced 4 candidate variables, but these were not included in Sawyer's (1939, 1955) catalogues. Kinman & Rosino (1962) later indicated that V1 was the only one of Shapley's candidate variables that they definitely found to be variable. Sawyer Hogg (1973) revised the x,y coordinates for V1 in her 3rd catalogue. V2-4 Barnes (1968) with ID charts V2 = Star #6 in Ring 1 Sector 3 V3 = Star #4 in Ring 4, Sector 1 V4 = Star G which is located in Ring 3, Sector 4 (V1 is star P which is located in Ring 2, Sector 2 The x,y coordinates were later derived by Sawyer Hogg (1973) in her 3rd catalogue. V5-7 Figuera Jaimes et al. (2013) with RA, dec and an ID chart for all the variables except V3. They also identified a candidate SX Phe variable which they designated as CSX1. =================================================================== References Barnes, S. A. 1968, AJ, 73, 579. Figuera Jaimes, R., Arellano Ferro, A., Bramich, D. M., Giridhar, S., Kuppuswamy, K. 2013, A&A, 556, A20 Kinman, T. D. & Rosino, L. 1962, PASP, 74, 499 Samus, N. N., Kazarovets, E. V., Pastukhova, E. N., Tsvetkova, T. M., Durlevich, O. V. 2009, PASP, 121, 1378 Sawyer, H. B. 1939, Publ. DDO, 1, No. 4 Sawyer, H. B. 1955, Publ. DDO, 2, No. 2 Sawyer Hogg, H. 1973, Publ. DDO, 3, No. 6 Shapley, H. 1920, ApJ, 52, 73 =====================================================================