Further Results from the NPOI Bright Star Survey

Details Further Results from the NPOI Bright Star Survey Further Results from the NPOI Bright Star Survey

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.1206h&link_type=abstract

American Astronomical Society Meeting 210, #12.06; Bulletin of the American Astronomical Society, Vol. 39, p.109

Astronomy and Astrophysics

Astronomy

Scientific paper

We present further results from an ongoing survey for multiplicity among the bright stars using the Navy Prototype Optical Interferometer (NPOI). While the NPOI has previously concentrated on producing visual orbits of known close speckle and spectroscopic binaries, we have now embarked on a broader survey to detect new binary/multiple systems. First, we report on advances in data processing algorithms and techniques for photon-noise bias corrections in the calibration of the interferometric visibilities. It is shown that application of these techniques significantly improves the quality of the uniform disk model fits to the resolved single stars in the survey sample. We also assessed the data set for each source for the likelihood of binarity through examining chi-square space gridded over a wide range of separation, position angle, and component magnitude difference. The angular separations examined ranged from sub-milliarcsecond to sub-arcsecond (significantly overlapping separations detectable by speckle interferometry). Binary models were then fitted to the likely candidates. The NPOI project is funded by the Oceanographer of the Navy and the Office of Naval Research.

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