New bound on neutrino dipole moments from globular-cluster stars

Details New bound on neutrino dipole moments from globular-cluster stars New bound on neutrino dipole moments from globular-cluster stars

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phrvl..64.2856r&link_type=abstract

Physical Review Letters (ISSN 0031-9007), vol. 64, June 11, 1990, p. 2856-2858. Research supported by NASA, DOE, NSF, and Univer

Physics

98

Dipole Moments, Globular Clusters, Neutrinos, Red Giant Stars, Star Clusters, Stellar Evolution, Bolometers, Stellar Luminosity, Stellar Mass

Scientific paper

Neutrino dipole moments mu(nu) would increase the core mass of red giants at the helium flash by delta(Mc) = 0.015 solar mass x mu(nu)/10 to the -12th muB (where muB is the Bohr magneton) because of enhanced neutrino losses. Existing measurements of the bolometric magnitudes of the brightest red giants in 26 globular clusters, number counts of horizontal-branch stars and red giants in 15 globular clusters, and statistical parallax determinations of field RR Lyr luminosities yield delta(Mc) = 0.009 + or - 0.012 solar mass, so that conservatively mu(nu) is less than 3 x 10 to the -12th muB.

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