Tonantzintla 2 / Pismis 26 / C1733-390
(Updated April 2014)

RA: 17:36:10.5  DEC: -38:33:12  (J2000)

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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
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ID       Position                     Period <mag>  ampl  C Type  Notes/
         RA/X        Dec/Y     Units                              Remarks
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1        17:36:17.03 -38:32:22.6 R0 ----     --     --
2        17:36:17.46 -38:32:34.2 R0 ----     --     --
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Supplementary Notes 

VI photometry by Bica et al. (1996) shows the colour-magnitude diagram 
has a red HB and indicates that the cluster is metal rich, [Fe/H] = ~-0.6. 
Their photometry extended to the main sequece turn-off region and showed 
a blue straggler population.  However, they did not carry out a variable 
star search and did not discuss the known variable stars.

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Discovery of the Variable Stars in Tonantzintla 2:
  V1-2
    Fourcade et al. (1966) with x,y positions and ID chart
    The RA and dec were derived by Samus et al. (2009) who commented
    that V2 is very red.
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References

Bica, E., Ortolani, S., Barbuy, B. 1996,  A&AS, 120, 153

Fourcade, C. R., Laborde, J. R., Albarracin, J. 1966, Atlas y Catalogue
de Estrellas Variables en Cumulos Globulares al sur de -29 degrees, Cordoba

Samus, N. N., Kazarovets, E. V., Pastukhova, E. N., Tsvetkova, T. M.,
Durlevich, O. V. 2009, PASP, 121, 1378
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