Other
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002phdt........19m&link_type=abstract
Thesis (PhD). YALE UNIVERSITY, Source DAI-B 63/05, p. 2424, Nov 2002, 235 pages.
Other
6
Scientific paper
It is important to examine stellar parameters jointly—for example, stellar masses vs. luminosities, stellar luminosities vs. surface temperatures, etc. But comparisons between masses and parameters inferred from photometry, such as luminosities and temperatures, have been limited. This is because masses can be directly measured only for the components of binary and multiple star systems; but, until recently, it has been difficult to measure the individual magnitudes of most of these components. This dissertation addresses the problem of acquiring accurate binary star photometry, and explores some initial results involving the luminosities and temperatures deduced from recent photometric measures. It focuses on binaries with the highest-quality visual orbits, and therefore on stars with generally the most precise masses. Of these binaries, the Yale-RIT binary star group has measured 521 differential magnitudes through the end of 2000. These measures are presented herein, with uncertainties, in both the original and the Johnson photometric systems. This dissertation also introduces a new method for calculating the effective temperatures and absolute magnitudes of binary star components, by fitting spectra to observed total and differential photometry. The method requires a minimum of assumptions, is statistically rigorous, and allows all available photometric data to be combined to potentially yield very precise parameter estimates. This method is applied to the Yale-RIT differential measures, in combination with other photometry from the literature, to yield the temperatures and absolute magnitudes of nine binaries. The implications of these results, such as their compatibility with stellar evolution models, are discussed. Also described are instrumentation and techniques that will improve binary star temperature and luminosity estimates, such as the new RIT-Yale Tip-tilt Speckle Imager (RYTSI), and SIM, the space mission that will measure very precise parallaxes.
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