AM-4 / C1353-269
RA: 13:56:21.7 DEC: -27:10:03 (J2000)

(Most recent updates: 
Membership probability flag - 2024; Remaining data - September 2018)
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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 

 CM diagrams by Inman & Carney (1987),  Carraro (2009) and Munoz et al.
 (2018) all illustrate that AM-4 has no giant or HB stars. The brightest 
 stars are post-main sequence subgiants.  The cluster seems to be
 tidally distorted and might be of extragalactic origin. 

 In an HST study, Hamron et al. (2013) measured stars down to about
 6 mags below the main sequence turnoff.  They detected a secondary 
 sequence above the MS, indicative of unresolved binary stars.  They 
 also detected two blue stragglers, but the variability status of these 
 stars is not known.

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References

Carraro, G. 2009, AJ, 137, 3809 

Hamren, K. M., Smith, G. H., Guhathakurta, P., Dolphin, A. E., Weisz, D.
R., Rajan, A., Grillmair, C. J. 2013, AJ, 146, 116

Inman, R. T. & Carney, B. W. 1987, AJ, 93, 1166 

Munoz, R. R., Cote, P., Santana, F. A., Geha, M., Simon, J. D., Oyarzun,
A., Stetson, P. B., Djorgovski, S. G. 2018, ApJ, 860, 66

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

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