Secondaries of eclipsing binaries. II. U Sagittae.
Abstract
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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- July 1979
- DOI:
- 10.1086/157211
- Bibcode:
- 1979ApJ...231..495T
- Keywords:
-
- Astronomical Spectroscopy;
- Companion Stars;
- Eclipsing Binary Stars;
- Radial Velocity;
- Algol;
- Line Spectra;
- Mass Ratios;
- Stellar Spectra;
- Astrophysics;
- Eclipsing Binaries