Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988acaps...8...26l&link_type=abstract
(Acta Astrophysica Sinica, vol. 8, 1988, p. 26-33) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 12, June 1988, p. 9
Astronomy and Astrophysics
Astrophysics
3
Eclipsing Binary Stars, Orbit Calculation, Stellar Motions, Stellar Spectra, High Dispersion Spectrographs, Mass Ratios, Orbital Elements, Radial Velocity
Scientific paper
High dispersion and time resolution spectra for the eclipsing binary AA UMa, obtained using an intensified Reticon, were measured by cross-correlation techniques. The spectra of the two components are found to be very similar, and AA UMa is shown to belong to Subtype W of W UMa binaries. The orbital elements of the system are determined and compared with other W UMa binaries. It is found that the orbital period is 0.48171 days and that the estimated mean mass center velocity for the system is -34.8 km/s. The mass ratio between the components is determined to be 0.54 and the magnitude difference in the wavelength observed is estimated to be 0.36.
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