Terzan 9 / C1758-268
RA: 18:01:38.8 DEC: -26:50:23  (J2000)

(Most recent updates: 
Membership probability flag - 2024; Remaining data - July 2016)
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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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No known variables.
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Supplementary Notes 

Terzan 9 is a heavily reddened cluster in a rich field in the inner
bulge.
A near infrared [K,J-K] CM diagram by Valenti et al. (2007) shows that
the innermost cluster region (r less than 30 arcsec) is characterized
by a narrow RGB and a blue HB. From their data, they derived a 
photometric [Fe/H] = -1.21.

Lynch & Ransom (2011) conducted a search for pulsars, but did not find
any in Terzan 9.

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References

Lynch, R. S. & Ransom, S. M. 2011, ApJ, 730, L11

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

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