[vsnet 719] CH Cygni comparison sequence extension

[bas@lowell.edu (Brian Skiff)]

     Last June, Gary Poyner asked me to measure a few stars in the field of
CH Cygni by way of extending the comparison sequence for this variable to
somewhat beyond the faint level it reached this spring.  I have now got two
nights on the four stars Gary selected.  In addition, as a consistency check,
I measured the star BD+49 2997, which is immediately west of CH Cyg and
labelled as "94" on the AAVSO (b)-scale chart dated June 1995, which is the
one posted at the AAVSO chart ftp site.  This star was the faintest of several
brighter ones observed in the field by Howard Landis, although his data are
not published except on the chart itself. All but the last star below are
bright enough to be plotted on the AAVSO chart.
     The results are listed below as per usual, with the standard deviation of
the pairs of observations listed in the second line of each entry.


Photometry of stars in the field of CH Cygni

Star               RA  (2000)  Dec         V     b-y   n
BD+49 2997      19 24 14.7  +50 15 20    9.376  0.150  2
                                          .009   .009
GSC 3551-0572   19 25 47.7  +50 03 15   10.126  0.567  2
                                          .009   .008
GSC 3551-0372   19 24 06.6  +50 06 44   10.847  0.889  2
                                          .004   .006
GSC 3551-0186   19 25 31.8  +50 26 26   11.031  0.725  2
                                          .025   .023
GSC 3551-0750   19 24 52.6  +50 02 48   11.718  0.737  2
                                          .025   .032


\Brian Skiff  (bas@lowell.edu)

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