Helium-3 in the horizontal-branch star Feige 86.
Abstract
Observations of He I at the wavelength of 6678 A in the blue horizontal-branch star Feige 86 indicate the presence of He-3 with a He-3 to He-4 ratio of about 0.7. Feige 86 has an effective temperature and surface gravity which are very similar to those of the Population I He-3 stars. This result greatly strengthens the link between the Population I Bp stars and the He-weak blue horizontal-branch stars and argues that diffusion is responsible for the He deficiency of both groups of stars.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- July 1979
- DOI:
- 10.1086/157175
- Bibcode:
- 1979ApJ...231..161H
- Keywords:
-
- B Stars;
- Helium Isotopes;
- Isotope Effect;
- Stellar Spectra;
- Stellar Temperature;
- Abundance;
- Graphs (Charts);
- Helium;
- Astrophysics;
- Blue Stars:Horizontal-Branch Stars;
- Helium:Population I Stars;
- Horizontal-Branch Stars:Element Abundances