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BVRI for faint field stars (fwd)



i think the following mail should be of interest to tass

jamie


---------- Forwarded message ----------
Date: Sat, 9 May 1998 01:06:24 -0700
From: Brian Skiff <bas@lowell.edu>
To: Jean-Claude.Mermilliod@obs.unige.ch, aah@nofs.navy.mil,
    aavso-discussion@physics.mcmaster.ca, dgm@nofs.navy.mil,
    gerard@simbad.u-strasbg.fr, guy@tahq.demon.co.uk, loneos@lowell,
    medkeff@c2i2.com, morel@ozemail.com.au, seu@pyxis.usno.navy.mil,
    vsnet@kusastro.kyoto-u.ac.jp
Subject: BVRI for faint field stars

     A couple of weeks ago I announced the availability of a file of V and V-R
photometry of faint stars.  The main intent was to provide rough photometric
zero-point calibration stars suitable for use with wide-field (1-3 degrees)
survey or sky patrol instruments, such as a CCD + telephoto lens.  Most of the
stars _are_not_ bona fide standards, but are suitable for calibration at the
0.05 to 0.1 mag. level.
     I have continued to build the list; the file now contains BVRI photometry
for about 2750 stars mostly fainter than V mag. 12 (as faint as mag. 22).
I have removed my bias against the southern sky, but few of the sequences are
near the galactic plane or in the Magellanic Clouds.  My literature survey
includes AJ, PASP, MNRAS, ApJS, and A&AS since about 1980 (i.e. after the
Cousins and Landolt standard lists gained wide circulation), and selectively in
the ApJ since about 1970.  The main A&A journal is still to be scanned.  Very
little of this data is contained in either SIMBAD or the Lausanne General
Catalogue of Photometric Data (http://obswww.unige.ch/gcpd/gcpd.html).  Apart
from Milky Way and MC lists, there's not much more to be added to this file,
and so it will not grow rapidly in the future, at least based on data already
published.
     Most of the stars are in small fields centered on galaxies that have had
supernovae, fields with active galaxies/quasars, CVs, and other variable stars.
Selected stars from the Guide Star Photometric Catalogue are included as well
as samplings from all of Landolt's papers containing standard stars or
sequences.  Sequences are available around most of the nearby galaxies, which
will be suitable for following luminous variables or calibrating ordinary novae
discovered in these objects.  Uncrowded stars near some moderate-to-high
latitude globular clusters are added.  I have made an effort to avoid crowded
stars, variables, stars of extreme color, and have generally avoided lists
where there are inconsistencies in the data or where sloppy work on the part of
the authors is evident.  A surprising amount of VRI photometry is still being
published on the Johnson system or on various ill-defined hybrid systems---this
data has been avoided entirely.
     A sample of the file is shown below.  The complete list (205Kb) can be
obtained from the Lowell public ftp site, accessible via the Web at:

ftp://ftp.lowell.edu/pub/bas/starcats/loneos.stds


\Brian

==========================================

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

Feige 16            1 54 34.5   -6 46 00 G  4688-0087  12.41 -0.01 -0.00 -0.00
SA 93-317           1 54 37.7   +0 43 01 G  0030-0078  11.55  0.49  0.29  0.59
S829-H              1 54 53.4   +0 22 12               15.09  0.63      
SA 93-333           1 55 05.1   +0 45 43 G  0030-0108  12.01  0.83  0.47  0.89
SA 93-424           1 55 26.3   +0 56 43 G  0030-0820  11.62  1.08  0.55  1.06
BD+37 425           1 57 12.0  +37 59 25 P              9.41  0.47  0.27  0.54
S685-F              1 58 47.8  -10 16 04               14.76  1.03      
BD+37 450           1 59 14.7  +38 00 55 P              8.99  1.02  0.52  1.01
MS 0158.5+0019 B    2 00 25.7   +0 33 10 G  0037-1119  13.30  0.99  0.54  1.04
MS 0158.5+0019 A    2 00 58.9   +0 34 39 G  0037-1097  13.12  0.67  0.37  0.74
P409-G              2 03 24.9  +19 19 47               15.63  0.74      
SJB c09-07          2 05 27.1  +12 06 28 b             16.94  0.80  0.44
SJB c09-10          2 05 28.3  +12 04 13 b             17.35  0.92  0.53
SJB c09-04          2 05 37.9  +12 09 13 b             17.53  0.90  0.49
P196-F              2 05 40.5  +44 04 09               15.18  0.88      
SJB c09-13          2 05 41.9  +12 04 10 b             17.63  0.63  0.42
P469-G              2 06 04.1  +14 43 28               15.36  0.59      
TT Ari-9            2 06 45.2  +15 17 39 A             17.20  0.83      
TT Ari-4            2 06 59.6  +15 17 35 A             15.49  0.52      
TT Ari-6            2 07 02.8  +15 19 41 A             16.04  0.49
=end=