CATALOG OF HST GUIDE STAR ACQUISITIONS
SERENDIPITOUS DUPLICITY SURVEY
Supplement to the Published
Duplicity Catalog
The complete electronic catalog of HST/FGS Acquisition
Double Stars referred to in:
"Duplicity in HST Guide Stars: FGS Serendipitous Survey Results"
by G. Schneider, J. L. Hershey, and M.T. Wenz
published in P.A.S.P,
110, #751, pp. 1012-1025 (1998), may be found here.
Queries should be addressed to: Glenn
Schneider at gschneider@as.arizona.edu.
This web site currently provides information on ALL
of the 4882 stars and 13,979 acquisitions examined for evidence of duplicity
in our serendipitous survey under HST Archival Research program AR/5811.
Most of these show no indication of harboring close companions within our
detection limits. The published catalog of 269 FGS doubles contains
only those detections of very high confidence as discussed in the above
referenced paper. The statistical certainty of detection declines
sharply for companions with separations less than approximately 30mas (also
as a function of delta-magnitude). Undoubtedly a significant number
of these (as well as some more widely spaced systems of larger delta-magnitude)
are actually double. The files available on this server will allow
individuals to assess for themselves the likelihood of duplicity for all
of the stars in our survey.
Under HST Archival Research program AR/8370 we anticipate
tripling the size of the current supplemental catalog with the addition
of information on 9,168 new stars from 26,279 acquisitions not previously
studied. Part II of the catalog, which should be released later this
year will span 1,766 days and contain data extracted from all acquisitions
from 1995 day 1, though 1999 day 316.
DUPLICITY SURVEY SUPPLEMENTAL FILES
Observation and duplicity information for the survey stars are keyed by
observation date/time, cross-referenced by HST Guide Star Catalog ID number.
The complete list of candidate stars analyzed in this study is given in
the Cross-Reference
List of Observed HST Guide Stars. Consult this list to find the
"root name" of the data files associated with the candidate guide star
of interest. The "root name" contains the date of the first acquisition
of the star. The Source (Input) Catalog
has been broken up into nine files (due to it's large size), organized
by date. To find information about a Guide Star of interest find
its data "root name" in the Cross-Reference List and search the appropriate
Source Catalog File for the file name or guide star ID. Records C-F
(for each acquisition) will provide information on the likelihood of duplicity.
Tabular (ASCII) listings of observed FGS S-Curves with
their acquisition parameters, as well as parametric
fits to double-star S-Curves may be downloaded as keyed by the data
root name. We also provide PostScript plots of the fringe
visibility functions for the detections of high confidence reported
in our published catalog.
Organized by date of acquisition
FORMAT
of the Source Catalog Files
1996:
Day 041-219
1996:
Day 220-318
1996
Day 318 - 1997 Day 073
1997:
Day 074-145
1997:
Day 145_215
1997:
Day 215-270
1997:
Day 271-328
1997:
Day 328-365
1998:
Day 001-046
Observed FGS S-Curves and Acquisition
Parameters
Headers: FGS Number, GSC Magnitude, X/Y Walkdown length, # lines of data,
U.T., FGS/FGE parameters, S/C Attitude and Sun Angle.
Content by Column: X-Coordinate, Y-Coordinate, X S-Curve, Y S-Curve
Possible
Double-Star Determined from Successful Walkdowns to FineLock
Possible
Double-Star Determined from Fine-Lock Failures
All Observed S-Curves (including those with no evidence of
duplicity) [not yet loaded on server]
Parametric Fits to Double Star S-Curves
Headers: FGS Number, GSC Magnitude, Separation (MAS), Magnitude Difference,
FGS-Axis, Guide Star ID, Error Ratios.
Content by Column: Coordinate, Observed Fringe Amplitude, Mode Fringe
Amplitude, Component Fringe Amplitudes
Note: The published double star catalog contains only those solutions
with very high confidence of duplicity (>~95%). For smaller separations
(typically <~30mas) the statistical certainty of duplicity is diminished.
The error ratios for both the candidate primary and secondary star fringe
visibility curves were used to establish the confidence level of duplicity
for those stars which were published in the catalog (see the referenced
paper for details).
Determined
from Successful Walkdowns to FineLock
Determined
from Fine-Lock Failures
PostScript Plots of Catalog Double
Star S-Curves
Determined
from Successful Walkdowns to FineLock
Determined
from Fine-Lock Failures
This work is based upon observations with the NASA/ESA
Hubble
Space Telescope obtained at the Space Telescope Science Institute,
which is operated by the Association of Universities for Research in Astronomy,
Inc., under NASA contract NAS5-26555.
This study is supported under Archive Proposals 5811 and 8370 to the
University of Arizona and Computer Sciences Corportion, with additional
resources from STScI's Science and Enginnering Support Division.