Other
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.2101p&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #21.01; Bulletin of the American Astronomical Society, Vol. 30, p.1281
Other
Scientific paper
The Hyades binary stars, such as theta (2) Tau, play important roles in the determination of astronomical distance scale. The extensive observations of this system have been done by different techniques in the past. Now the latest observations at various wavelengths from long baseline interferometers provide good opportunities to study physical pictures of the system of theta (2) Tau, and to compare measurement precision and accuracy claimed by different techniques. Long baseline interferometers can determine all of seven orbital parameters of a binary system independently, and also provide accurate differential photometry between two components within separations of milli-arc-second (mas). Lunar occultation can determine projected separations with precision of sub-mas, and provide magnitude differences at multiple wavelengths. Radial velocity measurements can determine four orbital parameters, and mass ratio of two components. It is interesting to compare measured results of theta (2) Tau that were derived from the above techniques, in particular, at various wavelengths. The comparison demonstrates the internal and external precisions of different techniques. The combination of the results of theta (2) Tau from interferometry and spectroscopy can determine the orbital parallax accurately, which can be compared with the Hipparcos parallaxes in order to check external errors of Hipparcos results independently. In addition, the masses of two components of theta (2) Tau have been determined accurately, and other fundamental parameters of theta (2) Tau, such as luminosities, radii, surface gravities, et al, have been analyzed.
Pan Xiaopei
PTI Collaboration
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