Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988cha%26a..12...99l&link_type=abstract
Chinese Astronomy and Astrophysics, Volume 12, Issue 2, p. 99-105.
Astronomy and Astrophysics
Astrophysics
1
Stars: Binaries, W Uma Systems, Spectroscopic Orbits
Scientific paper
High dispersion and time resolution spectra have been obtained for the eclipsing binary AA UMa by means of an intensified Reticon.The spectra were measured by cross-correlation techniques. From the spectroscopic observations, AA UMa is identified as a W UMa system. The orbital elements, determined for the first time, are P = 0.48171 days; T0 (corresponding to the time of midprimary eclipse) = HJD 2,446,520.4448; K1 = 124.0 km/sec; k2 = 227.7 km/sec. Like other W UMa systems, V0 is not well determined, but a value of -34.8 km/sec is probably a good estimate. According to the elements, a new ephemeris is given: HJD Min. I = 2,446,520.4448 + 0.468171E 8 48
The spectra of the two components of AA UMa are almost the same and consistent with Go V given in GCVS. The spectrum of the more massive component may possibly be a little later. The mass ratio between the components is determined to be 0.54 and the magnitude difference in the wavelength observed (close to B) is estimated to be 0.36.
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