NGC 6356 / C1720-177
RA: 17:23:34.93  DEC: -17:48:46.9 (J2000) 

(Most recent updates: 
Membership probability flag - 2024; Remaining data - July 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
=========================================================================
ID       Position               Mem   Period <mag>  ampl  C Type  Notes/
         RA          Dec        Flag                              Remarks
=========================================================================
1        17:23:33.72 -17:49:14.8 m2 230.6    17.35  1.7   B M     
2        17:23:42.12 -17:50:41.3 m1 ----     17.6   0.8   B Lb     
3        17:23:33.30 -17:48:07.4 m1 220.0    16.9   2.8   B M     mem 
4        17:23:48.00 -17:48:04.5 m1 207.3    17.35  2.3   B M     f?
5        17:23:17.06 -17:46:24.5 m1 219.8    17.55  1.9   B M     
6        17:22:54.71 -17:47:00.2 u  189.8    17.2   2.6   B M     f?
7        17:23:34.51 -17:49:13.0 f  ----     15.5   0.2   V Lb    
8        17:23:32.07 -17:47:59.2 m1 ----     15.8   0.4   V Lb    
9        17:23:32.47 -17:48:12.7 m1 ----     15.6   0.4   V Lb     
10       17:23:32.09 -17:49:15.3 m2 ----     15.65  0.1   V Lb    
==================================================================
Supplementary Notes 

The RA and dec for the variables are from Samus et al. (2009).

V1-6:   Periods, magnitudes, amplitudes, variability types  for V1-6
        are from Clement & Sawyer Hogg (1977)
        
        Membership status for V3 is based on a radial velocity study by
        Feast (1972).  Possible field status for V4 is from Lloyd Evans 
        & Menzies (1973) and for V6 from Clement & Sawyer Hogg (1977).
        With a distance of 9.8 arcmin from the cluster centre, V6 is
        outside the tidal radius of 9.3 arcmin (Harris 1996 - 2010
        update).

V7-10:  Magnitudes and amplitudes for V7-10  are from Lloyd Evans 
        & Menzies (1977). They classified these stars as red variables. 
        Since the GCVS does not use this term, we have classified them 
        as Lb.

================================================================
Discovery of the variable stars in NGC 6356:

  V1-5, F1=V6
    Sawyer, JRASC 47, 229 (1953) with x,y positions and  ID chart
    for V1-5
    Sawyer Hogg (1973) assigned the number V6 to F1 in her 3rd
    catalogue and an ID chart for V6 was published by Clement & 
    Sawyer Hogg (1977).
    In the Moscow GCVS, V5 and V6 are listed as V2009 and V1995 Oph
    respectively..

  V7-10 
    Lloyd Evans & Menzies (1973) who identify them as stars 34, 72, 
    30 and 46 of Sandage & Wallerstein (1960 - see Fig 2) 
    Sandage & Wallerstein (1960) also labelled V1 and V3 in Fig.2 and
    V2, V4 and V5 in Fig. 1 of their paper.
================================================================
References

Clement, C. C. & Sawyer Hogg, H.  1977, AJ, 82, 968 

Feast, M. W. 1972, QJRAS, 13, 191

Lloyd Evans, T. & Menzies, J. W. 1973, IAU Colloq. No. 21, Variable 
Stars in Globular Clusters and in Related Systems, 151

Lloyd Evans, T. & Menzies, J. W. 1977, MNRAS, 178, 163 

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

Sandage, A. R. & Wallerstein, G. 1960, ApJ, 131, 598
 
Sawyer, H. B. 1953, JRASC, 47, 229 

Sawyer Hogg, H. 1973,  Publ. DDO, 3, No.  6

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