The X-ray binary HD 77581.
Abstract
Measurements are presented from medium- and high-dispersion spectrograms of HD 77581 (= 2U 0900-40). The spectrum indicates that the primary is losing mass by a stellar wind, at some .000001 solar mass per year, normal for a BO Ia + star. Orbital elements for the system are derived which indicate a small eccentricity. A weak emission line is attributable to He II 4686 A and indicates a radial-velocity variation approximately in antiphase with the primary. These results, together with an analysis of the photometric observations, suggest masses of 45 and 2.6 solar masses for the components of the system.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- September 1974
- DOI:
- 10.1086/153105
- Bibcode:
- 1974ApJ...192..685H
- Keywords:
-
- B Stars;
- Eclipsing Binary Stars;
- Stellar Winds;
- Supergiant Stars;
- X Ray Stars;
- Astronomical Spectroscopy;
- Early Stars;
- Eccentricity;
- Helium Ions;
- Light Curve;
- Orbital Elements;
- Radial Velocity;
- Spectrophotometry;
- Astronomy