Separated Fringe Packet Observations with the CHARA Array

Details Separated Fringe Packet Observations with the CHARA Array Separated Fringe Packet Observations with the CHARA Array

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541914f&link_type=abstract

American Astronomical Society, AAS Meeting #215, #419.14; Bulletin of the American Astronomical Society, Vol. 42, p.278

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the modification of the orbits of several spectroscopic binarie and a completely new orbit for HD 198084, including data taken at the Center for High Angular Resolution Astronomy (CHARA) Array. These data were obtained using a modification of the little used technique of separated fringe packets (SFP). The accuracy of the SFP data surpasses that of data taken by speckle, but the technique is much more time and labor intensive. Additionally, using SFPs with the CHARA Array, it is possible to obtain separations below the detection range of speckle interferometry (>30mas) and above the range in "classic" long-baseline interferometry where fringes from a binary overlap and are no longer separated (<10mas). Using spectroscopic binary systems with published speckle orbits, we are able to test our new measurements against their ephemerides to calibrate the method as well as produce entirely new orbits for systems with no current astrometric observations.
The CHARA Array, operated by Georgia State University, was built with funding provided by the National Science Foundation, Georgia State University, the W. M. Keck Foundation, and the David and Lucile Packard Foundation. This research is supported by the National Science Foundation under grant AST 0908253 as well as by funding from the office of the Dean of the College of Arts and Science at Georgia State University.

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