Helium-3 in the horizontal-branch star Feige 86

Details Helium-3 in the horizontal-branch star Feige 86 Helium-3 in the horizontal-branch star Feige 86

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...231..161h&link_type=abstract

Astrophysical Journal, Part 1, vol. 231, July 1, 1979, p. 161-163.

Astronomy and Astrophysics

Astrophysics

20

B Stars, Helium Isotopes, Isotope Effect, Stellar Spectra, Stellar Temperature, Abundance, Graphs (Charts), Helium

Scientific paper

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.

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