Secondaries of eclipsing binaries. II - U Sagittae

Details Secondaries of eclipsing binaries. II - U Sagittae Secondaries of eclipsing binaries. II - U Sagittae

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...231..495t&link_type=abstract

Astrophysical Journal, Part 1, vol. 231, July 15, 1979, p. 495-501.

Astronomy and Astrophysics

Astrophysics

21

Astronomical Spectroscopy, Companion Stars, Eclipsing Binary Stars, Radial Velocity, Algol, Line Spectra, Mass Ratios, Stellar Spectra

Scientific paper

The velocity curve of the secondary of U Sagittae has been determined from out-of-eclipse observations of the NaD lines, the Ca II infrared triplet, and a 8806-A Mg I line of the secondary. All three types of line give a semiamplitude close to 200 km/s; the mean value is 209 + or - 5 km/s. The mass ratio and masses of the primary and secondary are: 2.99 + or - 0.08, 5.7 + or - 0.3 solar masses, and 1.9 + or - 0.1 solar masses, respectively. The secondary fills its Roche lobe.

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