Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pasp...97.1086l&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 97, Nov. 1985, p. 1086-1091.
Astronomy and Astrophysics
Astronomy
15
Circular Orbits, Eclipsing Binary Stars, Orbital Elements, Stellar Orbits, Stellar Spectrophotometry, Cross Correlation, High Resolution, Main Sequence Stars, Mass Ratios, Stellar Luminosity
Scientific paper
High-dispersion spectra have been obtained for the W UMa system U Peg. Time resolution was kept high by means of an image tube coupled to a Reticon. All the spectra were measured by cross-correlation techniques. The orbital elements for both components of the system have been determined to be: T(0) = 2445956.983, V(0) = 28.5 km/s, K(1) = 77.6 km/s, K2 = 246.5 km/s. A circular orbit is adopted. From the semiamplitudes of the two components, an accurate mass ratio m1/m2 = 3.18 is deduced. Spectrophotometric measurements were also carried out from which the luminosity ratio (determined from line-strength ratios) is deduced to be 1.47, corresponding to a difference of 0.42 mag in the blue region of the spectrum. Both stars are found to be on the main sequence; their spectral types are each close to G2 with the secondary a little earlier.
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