NGC 6235 / C1650-220
RA: 16:53:25.31 -22:10:38.8  (J2000)

(Most recent updates: 
Membership probability flag - 2024; Remaining data - March 2013)
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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
=========================================================================
1        16:53:24.28 -22:09:59.7 m1   0.6160 17.03  1.4   B RR0   
2        16:53:29.50 -22:14:11.0 m1   0.5838 17.31  1.5   B RR0   
3        16:53:02.56 -22:05:19.8 u  ----     16.58  0.6   B ?     f;V2249 Oph
4        16:53:36.18 -22:14:18.9 u   1.6209 15.78  0.8   B EA    max;V2250 Oph
5        16:53:29.45 -22:12:08.9 m1   0.3519 17.30  0.7   B RR1   altP=0.2602   
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Supplementary Notes 

The periods, amplitudes and classifications for V1-5 are from Liller's
(1977) photographic investigation and the B magnitudes are derived from 
Liller's (1980) revised calibration of the magnitudes.
The RA and dec are from Samus et al. (2009).

Howland et al. (2003) published a CCD CM diagram which showed a
predominantly blue HB.  They pointed out that the cluster is in the 
Ophiuchus-Scorpius region and therefore subject to differential reddening.
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Notes on individual stars

V3:  This star has two possible periods: 0.14188 or 0.16541 days.  Its 
     classification is uncertain.  It could be a close binary or an SX Phe
     and is not considered to be a cluster member.
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Discovery of the variable stars in NGC 6235

   V1-2
     Sawyer (1953) with x,y coordinates and an ID chart

    V3-5
      Liller (1977) with x,y coordinates and an ID chart

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References

Howland, R., Sarajedini, A., Tiede, G. P., Gokas, T., Djagalov, R.,
Martins, D. H. 2003, AJ, 125, 801

Liller, M. H. 1977, AJ, 82, 711 

Liller, M. H. 1980, AJ, 85, 673

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

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

Sawyer, H. B. 1953, JRASC 47, 229 
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