IC 1276 / Palomar 7 / formerly Abell 7 /C1808-072 
(Updated May 2014)

RA: 18:10:44.20  DEC: -07:12:27.4  (J2000)

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Bytes  Format      Explanation
1-8      A8        Star ID
10-32  A11,1x,A11  Position
34-35    A2        Units for position
                    R0 denotes RA, DEC in the J2000 coordinates
                    R5 denotes RA, DEC in the 1950 coordinates
                    XA denotes X, Y in arcseconds 
                    XP denotes X, Y in pixels
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                     Period <mag>  ampl  C Type Notes/
         RA/X        Dec/Y     Units                             Remarks
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1        18:10:51.55 -07:10:54.5 R0 222.0    21.1   1.8   B M    Sloan
2        18:10:44.5  -07:12:31   R0   0.548  19.45  1.1   B RR0   
3        18:10:50.79 -07:13:49.1 R0 300.0    19.9   4.2   B M    Sloan
4        18:10:48.37 -07:10:33.0 R0 ----     19.15  0.7   B SR    
5        18:10:31.02 -07:08:57.1 R0 ----     19.2   0.8   B SR    


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Supplementary Notes 

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

The periods and classifications for V1 and V3, the two Mira variables, 
are from Sloan et al. (2010) who published K band light curves. The B
magnitudes and amplitudes for these stars are from Kinman & Rosino (1962).

The periods, magnitudes, amplitudes and variability types for V2, V4 and
V5 are from Kinman & Rosino (1962).

All of the variables are considered to be cluster members.  Their
magnitudes are appropriate for cluster membership and they are all
well inside the tidal radius which is 21.6 arcmin according to the 
2010 update to the Harris (1996) catalogue.

Barbuy et al. (1998) published a BV colour-magnitude diagram that
showed a prominent red HB, characteristic of a metal rich population.  
Cote (1999) later derived [Fe/H] = -0.75 from the equivalent widths of 
iron lines in 5 RG stars considered to be cluster members on the basis 
of their radial velocities.

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Discovery of the Variable Stars in Pal 7:

  V1
    Sawyer Hogg (1959) with ID chart
    The cluster was referred to as IC 1276 in her paper.

  V2-5
    Kinman & Rosino (1962) with x,y positions and ID chart for V1-5
    The cluster was referred to as Abell 7 = IC 1276 in their paper.
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References

Barbuy, B., Ortolani, S., Bica, E. 1998, A&AS, 132, 333

Cote, P. 1999, AJ, 118, 406

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

Kinman, T. D., Rosino, L. 1962, PASP, 74, 499

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

Sawyer Hogg, H. 1959, JRASC, 53, 97

Sloan, G. C., Matsunaga, N., Matsuura, M., Zijlstra, A. A., Kraemer, K.
E., Wood, P. R., Nieusma, J., Bernard-Salas, J., Devost, D., Houck, J. R. 
2010, ApJ, 719, 1274

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