Other
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.7708h&link_type=abstract
American Astronomical Society, 189th AAS Meeting, #77.08; Bulletin of the American Astronomical Society, Vol. 28, p.1374
Other
Scientific paper
The capabilities for close double star detection and characterization from HST Fine Guidance System acquisition data have been described by the authors previously (1996, BAAS 27,1340). Subsequently, data from approximately 6000 guide star acquisitions spanning a six month period, representing approximately 1/4 of the stars in our current survey, have been searched for evidence of stellar duplicity with an automated tool. We have found that 8% of the stars in this sample give evidence of possessing a stellar companion. For the great majority of cases where fine lock is reached (>99% of all acquisition attempts) differential correction solutions from the FGS fringe visibility function are performed. Approximately 70% of all targets are visited on successive orbits resulting in multiple acquisitions on many guide stars, thus providing multiple data sets for duplicity analysis. To ascertain the possibility of a secondary component, two position constants and two fringe amplitude constants are sought. For potential blended pairs (separation < 100 mas) the parameter space near the interferometric null-crossing is fit. Another solution searches for the presence of secondary fringes through the remainder of the roughly half arcsecond walkdown path. Solutions where both amplitudes exceed their formal errors by a factor of 2 in the first case, and 1.6 in the latter, are flagged for probable duplicity and subjected to further analysis. Separations as close as 30 mas sometimes reach the ratio-of-2 criterion. The detection limits are difficult to ascertain without independent checks and some fraction of those stars identified as double may be spurious. We are currently working on quantifying our multi-parametric detection limits and sample completeness, which will be ascertained before the publication of a duplicity catalog of our complete survey. Support for this work was provided by NASA through grant AR5811 from STScI, which is operated by AURA, Inc. under NASA contract NAS5-26555.
Hershey John
Schneider Gerardo
Wenz Michael
No associations
LandOfFree
A Search for Stellar Duplicity and Variability from FGS Guide Star Acquisitions and Guiding Data - Project Status does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A Search for Stellar Duplicity and Variability from FGS Guide Star Acquisitions and Guiding Data - Project Status, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Search for Stellar Duplicity and Variability from FGS Guide Star Acquisitions and Guiding Data - Project Status will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-817808