[vsnet-chat 653] BVI sequence near GRO J0422+32

[bas@lowell.Lowell.Edu (Brian Skiff)]

     Below is another photometric sequence from the literature, this time a
faint BVI sequence observed by Chevalier and Ilovaisky around the x-ray
transient object GRO J0422+32 = Nova Persei 1992 = V518 Persei.  Using their
chart I have identified the stars in the GSC and in the comprehensive USNO A1.0
star catalogue.
     Along with the BVI photometry, the final columns show the red and blue
magnitudes from the A1.0 catalogue.  If we assume that V-R is exactly one-half
of the V-I color, then the A1.0 'r' magnitudes are consistently about 0.5 mag.
too bright in this field compared to Cousins R.  The blue magnitudes can be
compared more directly, and this shows the A1.0 'b' magnitudes are close to
standard B in this region, and with very little scatter.

\Brian

++++++++++++++++++++++++++++++++++++++++++++++++

Photometry of stars in the field of GRO J0422+32
source:  Chevalier & Ilovaisky (1995 A&A 297, 103)

Name     RA  (2000)  Dec        GSC       V    B-V   V-I     mr    mb
2      4 21 41.3  +32 54 02             17.01  0.94  1.08   16.0  17.9
3      4 21 37.7  +32 53 41  2376-1152  14.14  0.82  1.00   13.1  15.0
4      4 21 42.6  +32 54 49             16.62  1.04  1.18   15.5  17.9
5      4 21 47.7  +32 55 29             17.74  1.02  1.17   16.6  18.9
6      4 21 46.7  +32 55 22             16.92  0.88  1.02   16.0  17.7
7      4 21 44.9  +32 55 14             15.74  0.98  1.14   14.7  16.6
8      4 21 42.2  +32 55 32             15.67  1.09  1.20   14.4  16.7
9      4 21 40.0  +32 55 43  2376-1048  14.52  1.30  1.40   13.3  15.9
10     4 21 43.1  +32 56 53  2376-1592  14.35  1.30  1.39   13.2  15.6

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