[vsnet-chat 3635] BVRI photometry file update

[Brian Skiff <bas@lowell.edu>]

     I have again made fairly substantial additions to my large BVRI
photometric reference file.  Along with several sequences from papers
published in journals, I have brought the collection of extracts of Arne
Henden's data up to his early September 2000 reductions.  From Arne's often
very long lists for any field I try to select only about two dozen stars with
small photometric errors such that I get 3 to 5 uncrowded stars per magnitude
interval.
     The major change is that I have expanded the format of the file to allow
for an extra decimal in both RA/Dec and in the photometry, viz. to 0".1
precision in position, and to 0.001 mag. precision in magnitudes and colors.
A sample is shown below where old and new data are mixed.  Each line is now
84 columns wide.  The increased precision in positions is in anticipation of
obtaining position future astrometric catalogues of precision.  This and the
change for the photometry also greatly reduce the work necessary to assemble
lists from machine-readable files.  I do not plan for the moment to add the
extra decimals in either position or photometry for the stars that lack them.
(Most of the photometry does not justify the third decimal place.)  A sample
with the old and new data mixed is shown below.
     The star-count is about 32400; median V is near 13.8, with most stars
between mag. 11 and 18.  Some brighter standards are included, and for quite
a number of fields there are stars as faint mag. 22.  The collection is
intended for use in calibrating scans of photographic surveys, current wide-
field digital surveys, providing "instant" calibration for variables, GRBs,
asteroids, supernovae, etc.
     The complete files are at:

http://ftp.lowell.edu/pub/bas/starcats/loneos.phot        (2.7Mb uncompressed)
http://ftp.lowell.edu/pub/bas/starcats/loneos.phot.gz     (664Kb compressed)

...for flat ASCII and gzip-compressed versions.  The bibliographic reference
file has also been amended accordingly:

http://ftp.lowell.edu/pub/bas/starcats/loneos.ref         (113Kb)

A date given at the top of each file shows when it was last modified.


\Brian

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123456789012345678901234567890123456789012345678901234567890123456789012345678901234
         1         2         3         4         5         6         7         8

Name                  RA   (2000)   Dec     s    GSC       V     B-V     V-R    V-I

NGC 382 6           1 07 13.76  +32 20 46.5 G 2282-1037  14.324  0.687         0.793
NGC 419 K           1 07 15.2   -72 49 34   A            15.56   1.88   0.73   1.58 
M56.3 12            1 07 17.5   -81 39 57   A 9359-0412  14.27   0.93               
NGC 382 7           1 07 17.72  +32 20 15.9 G 2282-1315  12.928  0.931  0.542  0.991
NGC 382 3           1 07 19.88  +32 23 39.9 A            15.829  0.525  0.315  0.693
BPS CS 29518-2      1 07 20.1   -32 17 49   A 6999-1316  15.30   0.10               
NGC 419 H           1 07 20.3   -72 51 10   A            14.40   1.68   0.75   1.47 
NGC 382 5           1 07 21.13  +32 21 51.0 A 2282-0967  14.606  0.794  0.474  0.863
Yale 45803694       1 07 21.7   -29 13 19   A            17.52   0.86               
NGC 382 2           1 07 22.07  +32 23 22.8 G 2282-0589  12.729  0.465  0.294  0.581
Yale 45803695       1 07 22.1   -29 12 06   A            16.56   0.98               
NGC 382 4           1 07 22.15  +32 22 18.4 A            15.988  0.667  0.394  0.747
AzV 108F            1 07 22.8   -70 17 30   G 9139-1027  11.30   1.01               
NGC 419 N           1 07 24.5   -72 49 55   A            15.83   0.90   0.34   0.90 
[S66c] 0112+60 10   1 07 25.2   +59 41 45   G 3681-0443  12.28   0.53

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