[vsnet-chat 1692] Photometric reference file additions

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

Star-catalogue folks,
     In the last few days I have added about 1000 stars in some 80 new fields
to my large BVRI photometric reference file.  The list now contains some 21700
stars over the whole sky mostly fainter than mag. 10, with a median magnitude
near V=14.0.  Flat ASCII and gzip-compressed versions are available at:

http://ftp.lowell.edu/pub/bas/starcats/loneos.stds        (1.5Mb uncompressed)
http://ftp.lowell.edu/pub/bas/starcats/loneos.stds.gz     (421Kb compressed)

A small bibliographic reference file is at:

http://ftp.lowell.edu/pub/bas/starcats/loneos.ref

     The new additions are mainly from Arne Henden's re-reduced and newly
observed collection of BV variable-star sequences (some BVRI sets as well).
I trimmed these files so that they contain about 25 stars in each field.  This
was done by omitting all stars with nominal errors > 0.030 mag. in both V and
B-V, then selecting somewhat randomly about four or five stars per magnitude
interval, and finally running this list into VizieR against USNO-A2.0 to
eliminate stars that have close companions (in most cases closer than 15"
at high latitude and 10"-12" in the galactic plane) less than 4 or 5 magnitudes
fainter than the sequence star.  Where applicable, I have replaced Arne's
published data with the re-reduced results.
     I have also added in most of the twenty-two sequences around recent
supernovae published by Riess et al. in the February 1999 issue of the
Astronomical Journal (1999 AJ 117,707).  These include faint BVRI sequences
scattered mostly around the north galactic cap.
     These latest additions to the list are the last before gearing up to start
recalibrating the USNO-A2.0 magnitudes in hopes of placing them systematically
on the standard B and R systems.

\Brian

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