Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..240...59f&link_type=abstract
Binary Stars as Critical Tools & Tests in Contemporary Astrophysics, Proceedings of IAU Symposium #240, held 22-25 August, 2006
Astronomy and Astrophysics
Astrophysics
Scientific paper
We present a progress report on a program to improve the orbits of known spectroscopic binaries that are potential targets for ground-based optical interferometers, such as the CHARA array and PTI. The combination of such observations results in three-dimensional orbits that produce very accurate masses (uncertainties of 0.1-0.2% in the best cases) as well as orbital parallaxes that are generally more precise than those from Hipparcos. Additional analyses determine other basic parameters of the stars. The components can then be compared with theoretical evolutionary tracks. Extensive observing began in 2002 April, and we are currently obtaining high-resolution, red-wavelength spectra at McDonald Observatory, Kitt Peak National Observatory, and Fairborn Observatory. For 40 systems we have accumulated 10 or more spectra that show resolved components. Results to date are highlighted.
Fekel Francis C.
Tomkin Jocelyn
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