Red-giant evolution, metallicity, and new bounds on hadronic axions

Details Red-giant evolution, metallicity, and new bounds on hadronic axions Red-giant evolution, metallicity, and new bounds on hadronic axions

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phrvl..66.2557h&link_type=abstract

Physical Review Letters (ISSN 0031-9007), vol. 66, May 20, 1991, p. 2557-2560. Research supported by DOE and NASA.

Astronomy and Astrophysics

Astrophysics

36

Hadrons, Metallicity, Nuclear Astrophysics, Red Giant Stars, Stellar Evolution, Abundance, Elementary Particles, Emission Spectra, Horizontal Branch Stars

Scientific paper

Stellar cooling by nuclear axion emission is explored, identifying those special isotopes that dominate this process for temperatures from 10 to the 7th to 10 to the 9th K. It is argued that such nuclear energy-loss mechanisms are distinctive because the effects track metallicity. Three observables associated with evolution of stars along the red-giant and horizontal branches are shown to impose new and restrictive constraints on axions in the hadronic window.

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