[vsnet-chat 3588] V1316 Cyg sequence

["Bruce Sumner" <b.sumner@bom.gov.au>]

Here is a sequence for V1316 Cyg. Be aware of recent discussions 
regarding the actual identification of this variable [vsnet-chat 
3580] and [vsnet-chat 3585]. I am confident that the identification 
given here is correct, but a recheck of the original discovery paper 
might prove instructive.
Regards,
Bruce Sumner
------------
168  V1316 CYGNI   (UGSU:)   Range: 14.1-17.6V
     Position:   20 12 13.67  +42 45 51.4  (J2000, in .dat file)
     Magnitude:  V=17.583    B-V=0.252    (in .dat file) 
         
a) Comparison star sequence
                                                            
ID      RA  (2000)   DEC       X    Y  N    V      ERR    B-V    ERR

1   20 11 56.3  +42 42 48  -192 -183  3  12.387  0.017   0.496  0.028 
2   20 11 45.1  +42 51 06  -315  315  3  12.796  0.017   0.512  0.005 
3   20 12 27.1  +42 43 09   148 -163  3  13.057  0.016   0.637  0.005 
4   20 12 36.2  +42 48 32   247  161  3  13.251  0.014   0.816  0.003 
5   20 12 06.8  +42 48 50   -76  179  3  13.840  0.016   0.706  0.004 
6   20 12 24.4  +42 46 28   118   37  3  14.108  0.014   0.778  0.008 
7   20 12 08.3  +42 48 04   -60  133  3  14.314  0.013   0.974  0.014 
8   20 12 12.7  +42 45 54   -11    2  3  14.779  0.014   0.865  0.006 
9   20 12 18.7  +42 44 23    55  -88  3  15.120  0.016   0.944  0.027 
10  20 12 13.2  +42 43 38    -6 -133  3  15.683  0.011   0.883  0.009 
11  20 12 13.9  +42 47 56     3  125  3  16.085  0.018   0.979  0.017 
12  20 12 12.6  +42 44 45   -12  -67  3  16.394  0.013   0.999  0.062 
13  20 12 11.9  +42 46 32   -20   41  3  16.970  0.063   1.346  0.060 
14  20 12 15.9  +42 45 20    24  -31  3  17.738  0.307   1.239  0.398 
15  20 12 20.6  +42 47 08    76   77  2  18.261  0.000   0.982  0.152 
  
b) Wide-colour extension for CCD calibration

    20 12 35.6  +42 51 04   241  313  3  13.713  0.014   0.581  0.004 
    20 11 57.0  +42 41 38  -184 -253  3  13.866  0.019   0.626  0.005 
    20 12 27.0  +42 44 49   147  -62  3  11.521  0.171   1.786  0.169 
    20 12 01.7  +42 47 17  -132   86  3  12.131  0.054   2.051  0.057 
    20 11 47.5  +42 44 18  -289  -93  3  15.732  0.006   2.421  0.061 
  
Notes:

1. The position of V1316 Cygni shown in Downes and Shara, PASP, 1993 
is incorrect. The real variable is in fact the faint star some 12 
arcsec east of the indicated star. This has been determined from B 
and V photometry (the candidate is very blue) and magnitude 
fluctuations in quiescence, using photometric data obtained by Henden 
and Honeycutt for their paper Secondary Photometric Standards for 
Northern Cataclysmic Variables and Related Objects, 
PASP,109,441,1997.

2. The D&S candidate is star 8 in this sequence, and extreme care 
will be necessary not to confuse this constant star with the 
variable, particularly when the variable is faint.

Bruce Sumner
5 September 2000

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