Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21714401k&link_type=abstract
American Astronomical Society, AAS Meeting #217, #144.01; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
ZZ Bootis is a detached eclipsing binary that has been the subject of spectroscopic analysis before, yet these data were acquired in 1950s and the early 1960s, which prompted us to further study this system. Earlier this year, we acquired spectroscopic data from a 2.1m telescope at Kitt Peak National Optical Astronomy Observatory of ZZ Boo at eighteen different phases. The parameters deduced from eclipsing binaries are used to calibrate our current evolutionary models. These observations give physical confirmation of our theories and allow us to calibrate the mass-luminosity relationship from which the masses of single stars can be estimated. Because a large proportion of stars exists in binary systems, binaries are particularly important to our understanding of the processes by which stars form. Furthermore it has been demonstrated that eclipsing binaries are excellent distance indicators, permitting the calibration of the cosmic distance scale essentially free from assumptions. We prepare the data for study by performing cosmic ray removal, wavelength calibration, and flux normalization for cross-correlations to extract radial velocities. After the reduction process, we use PHOEBE to simultaneously model light curves, radial velocity curves, and spectra of ZZ Boo. We present our current findings on our poster. We gratefully acknowledge grant NSF/RUI grant AST-05-07542.
Engle Scott
Kirk Brian
Prsa Andrej
Robertson James
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