[vsnet-chat 2666] V382 Vel deep BV sequence

[Brian Skiff <bas@lowell.edu>]

     The February 2000 issue of PASP includes a paper by Platais et al.
concerning astrometry and photometry of V382 Vel = Nova Vel 1999 (2000 PASP
112, 224).  Their precise position for the nova for equinox 2000 and epoch
1999.53 is:  10 44 48.3981  -52 25 31.147.  This confirms the USNO-A2.0
identification of the precursor by Patrick Schmeer (if I recall correctly),
which is not mentioned in this paper.  That the star is even in USNO-A is
overlooked as well.  They found a quiescent magnitude of V=16.56 and B-V=0.14;
USNO-A2.0 shows mb=16.4 and mr=16.4 (mean epoch 1979.563)---not too bad!
     The paper also includes a faint BV sequence in the field of the nova.
I show this below.  I have used either USNO-A2.0 (source A in column 's') or
GSC-ACT positions (source G).  In the original table, the positions are given
in degrees only.  In obtaining the positions (using the Strasbourg 'VizieR'
utility), I also checked for near companions to each star.  Those that I
deemed "crowded" are so marked in the last column.  This indicates that there
is at least one star within 10" radius and less than about 4 magnitudes
fainter than the sequence star.  Obviously this is a dense field, so many of
the stars have close companions.  Use of the stars for CCD photometry will
depend partly on the image scale of your CCD, and also on how well your
reduction software deals with crowded fields.

\Brian



Name                RA   (2000)   Dec     s     GSC       V    B-V    comment
V382 Vel 973     10 44 36.56  -52 22 36.9 G  8210-0891  11.78  0.93
V382 Vel 902     10 44 36.71  -52 24 53.4 G  8210-1729  12.61  1.20
V382 Vel 814     10 44 36.12  -52 27 21.5 G  8210-2839  13.99  1.14
V382 Vel 835     10 44 26.58  -52 26 54.9 A             14.38  1.39
V382 Vel 952     10 44 42.17  -52 23 23.6 A             14.60  0.94   crowded
V382 Vel 845     10 44 33.26  -52 26 23.4 A             14.92  1.37
V382 Vel 963     10 44 59.73  -52 23 02.1 A             15.10  0.81   crowded
V382 Vel 989     10 44 37.25  -52 21 54.4 A             15.53  1.25   crowded
V382 Vel 823     10 44 29.14  -52 27 11.9 A             15.61  0.70   crowded
V382 Vel 879     10 45 01.70  -52 25 35.6 A             15.76  0.44   crowded
V382 Vel 971     10 45 03.20  -52 22 45.6 A             16.04  0.74
V382 Vel 1281    10 45 04.27  -52 27 48.9 A             16.10  0.64   crowded
V382 Vel 945     10 44 37.81  -52 23 34.1 A             16.20  0.79   crowded
V382 Vel 929     10 44 38.02  -52 23 56.0 A             16.36  0.92
V382 Vel 863     10 44 26.36  -52 25 48.5 A             16.45  0.80   crowded
V382 Vel 842     10 44 30.14  -52 26 30.3 A             16.62  1.06   crowded
V382 Vel 795     10 44 33.88  -52 28 14.0 A             16.67  0.76
V382 Vel 1314    10 45 08.36  -52 25 51.5 A             16.86  1.19
V382 Vel 1303    10 45 05.68  -52 26 31.1 A             16.87  1.00
V382 Vel 1276    10 45 04.14  -52 28 00.4 A             17.03  0.97   crowded
V382 Vel 1352    10 45 06.01  -52 23 53.2 A             17.18  0.96
V382 Vel 944     10 44 29.68  -52 23 35.5 A             17.41  0.79   crowded

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