NGC 1904 / C0522-245 / Messier 79 (Updated July 2013) RA: 05:24:11.09 DEC: -24:31:29.0 (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 05:24:13.00 -24:34:44.1 R0 ---- 15.0 -- V NV Note 2 05:24:16.75 -24:32:34.4 R0 ---- 14.5 0.6 P SR 3 05:24:13.53 -24:32:28.9 R0 0.7361 16.05 0.93 V RR0 4 05:24:17.76 -24:32:16.1 R0 0.6338 16.11 1.01 V RR0 5 05:24:10.21 -24:31:02.9 R0 0.6689 15.72 0.61 V RR0 Note;blend 6 05:24:06.01 -24:29:32.5 R0 0.3471 16.16 0.52 V RR1 7 05:24:12.67 -24:31:41.7 R0 ---- 13.65 0.7 V CW? Note 8 05:24:11.55 -24:31:38.3 R0 ---- -- -- ? 9 05:24:12.56 -24:31:52.6 R0 0.3598 16.07 0.36 V RR1 or RR01? 10 05:24:12.10 -24:31:34.2 R0 0.7288 15.03 0.34 V RR0 blend 11 05:24:11.92 -24:31:34.1 R0 0.8235 16.01 0.51 V RR0? 12 05:24:11.36 -24:31:27.3 R0 0.3242 16.11 0.64 V RR1 13 05:24:10.57 -24:31:11.1 R0 0.6894 16.06 0.92 V RR0 14 05:24:07.76 -24:31:00.0 R0 0.3237 16.15 0.28 V RR1 ======================================================================= Supplementary Notes A major paper on the variables in NGC 1904 (M79) is by Kains et al. (2012). They carried out a thorough analysis of the RR Lyrae variables. In the above table, all the data for V3-7 and V9-14 are from the study by Kains et al. V2 and V8 were saturated in their reference images, so the RA and dec for these two stars are from Samus et al. (2009) and the magnitude, amplitude and classification for V2 are from Rosino (1952). It seems probable that V8 might also be a semi-regular, like V2. ================================================================== Notes on Individual Stars V1: Rosino (1952) questioned the variability of V1 and its non-variable status was confirmed by Kains et al. The RA and dec listed aove are from Samus et al. (2009). V5: This is the same star as NV6 of Amigo et a. (2011). According to Samus (2011, private communication), the RA and dec that Samus et al. (2009) published for V5 pertain to a different star. It was difficult to identify the correct variable because of the crowded field on Bailey's (1902) ID chart. V7: Kain et al. showed that this star shows long term variability. Its location on their CM diagram indicates that it might be a long period type II Cepheid. ================================================================= Discovery of the variable stars in M79: V1-5 Bailey (1902) with x,y coordinates (page 238) and an ID chart (plate X, Fig 2, page 252.19) V6 Rosino (1952) with x,y coordinates and an ID chart for V1-6 (The ID chart appeared in the Bologna Pub version of his paper, but not in the electronic edition of Memoirs of the Italian Astronomical Society.) Rosino made small corrections to the y coordinates published by Bailey for V3 and V4 and commented that his V3 was too faint to be detected on the print published by Bailey (1902). V7-8 Tsoo Yu-hua (reported to Sawyer Hogg in a 1965 letter) In her 3rd catalogue, Sawyer Hogg (1973) assigned the numbers V7-8 and published their x,y coordinates. V9-13 = NV1-5 Amigo et al. (2011) with RA and dec V14 Kains et al. (2012) with RA, dec and ID charts Variables V2-14 are all labelled on their ID chart. ================================================================ References Amigo, P., Catelan, M., Stetson, P. B., Smith, H. A., Cacciari, C., Zoccali, M. 2011, in Carnegie Obs. Astrophys. Series, Vol. 5: RR Lyrae Stars, Metal-Poor Stars, and the Galaxy, ed. A. McWilliam = 2011arXiv1105.0896v1 Bailey, S. I. 1902, Harvard Annals, Vol 38 Kains, N., Bramich, D. M., Figuera Jaimes, R., Arellano Ferro, A., Giridhar, S., Kuppuswamy, K. 2012, A&A, 548, A92 Rosino, L. 1952, Bologna Pub, 5, No. 20 = Mem Soc Ast It, 23, 101 Samus, N. N., Kazarovets, E. V., Pastukhova, E. N., Tsvetkova, T. M., Durlevich, O. V. 2009, PASP, 121, 1378