Terzan 4 / C1727-315
(Updated  July 2016)

RA: 17:30:39.00  DEC: -31:35:43.9  (J2000)  This needs to be checked

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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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No known variables
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Supplementary Notes

Terzan 4 is a heavily reddened cluster in a rich field in the Galactic 
bulge.  Valenti et al. (2010) published a near infra-red CM diagram 
(K, J-K) which is heavily contaminated by stars in the surrounding metal 
rich field population. When looking at stars within 40 arcsec of the 
cluster centre, they detected a blue HB.
They used their data to derive a photometric [Fe/H] = -1.58, in good
agreement with the [Fe/H]=-1.6 published by Stephans & Frogel (2004) and
by Origlia & Rich (2004) from studies based on high-resolution IR 
spectroscopy.

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References

Origlia, L., Rich, R. M.  2004, AJ, 127, 3422

Stephans, A. W., Frogel, J. A. 2004, AJ, 127, 925

Valenti, E., Ferraro, F. R., Origlia, L. 2010, MNRAS, 402, 1729
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