Velocity curves for broad and sharp components observed in the emission lines from AM Herculis.
Abstract
High-resolution observations of the profiles of the He I 4471-A and He II 4686-A emission lines have been obtained around a complete cycle of the X-ray binary AM Her. The profiles are resolved into broad (B) and sharp (S) components; velocity curves are given for each component for both the He I and He II lines. The velocity amplitude of the B component is about 4 times that of the S component. The two components vary out of phase by 133 (+ or -5) deg. The S component is at conjunction during the soft X-ray eclipse. Implications of these results for models of AM Her are discussed.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- December 1977
- DOI:
- 10.1086/182589
- Bibcode:
- 1977ApJ...218L.121G
- Keywords:
-
- Astronomical Spectroscopy;
- Binary Stars;
- Emission Spectra;
- Spectral Resolution;
- Stellar Spectra;
- X Ray Sources;
- Helium;
- Helium Atoms;
- Photon Density;
- Velocity Distribution;
- Astrophysics