NGC 6440 / C1746-203
RA: 17:48:52.67  DEC: -20:21:34.5   (J2000)

(Most recent updates: 
Membership probability flag - 2024; Remaining data - January 2015)
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Bytes  Format      Explanation
1-8      A8        Star ID
10-32  A11,1x,A11  Position
34-35    A2        Membership probability flag based on data published
                   by Prudil & Arellano Ferro (2024)
                    m1: prob >=0.85;  m2: prob >=0.7 and <0.85;
                    m3: prob >= 0.5 and <0.7; f: prob <0.5
                    u:  no data available
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               Mem   Period <mag>  ampl  C Type  Notes/
         RA          Dec        Flag                              Remarks
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PSR      -- -- --     -- -- --   u  ----     --     --            8 msPs
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Supplementary Notes

NGC 6440 is a heavily reddened metal rich cluster near the Galactic
centre.  According to the 2010 update to the Harris (1996) catalogue,
it has [Fe/H] = -0.36 and a CM diagram by Piotto et al. (2002) based on 
BV HST observations shows a prominent red HB.  The CMD does not extend 
as faint as the main sequence turnoff and has too much scatter to make
it possible to discern a blue straggler sequence.

Using Chandra observations, Pooley et al. (2002) found 24 X-ray sources
within the cluster half-mass radius and these have been discussed in
subsequent papers.  Some of them may be LMXBs and others are probably
cataclysmic variables.

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Discovery of the variable stars in NGC 6440
    PSR:  
     According to Paulo Freire's website at the Max Planck Institute 
     in Bonn (July 2024 version), there are 8 millisecond pulsars 
     in NGC 6440.
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References

Harris, W. E. 1996, AJ, 112, 1487

Piotto, G., King, I. R., Djorgovski, S. G., Sosin, C., Zoccali, M.,
Saviane, I., De Angeli, F. and 5 coauthors, 2002, A&A, 391, 945

Pooley, D., Lewin, W. H. G., Verbunt, F., Homer, L., Margon, B.,
Gaensler, B. M., Kaspi, V. and 3 coauthors, 2002, ApJ, 573, 184

Prudil Z., Arellano Ferro, A. 2024, MNRAS, 534, 3654

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