Other
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990natur.343..347d&link_type=abstract
Nature (ISSN 0028-0836), vol. 343, Jan. 25, 1990, p. 347, 348. Research supported by NASA, DOE, NSF, and University of Californi
Other
6
Dark Matter, Globular Clusters, Stellar Evolution, Stellar Luminosity, Horizontal Branch Stars, Red Giant Stars, Stellar Oscillations
Scientific paper
The ability of weakly interacting particles called cosmions to suppress convection in the cores of horizontal-branch stars is investigated numerically. It is found that such convection-breaking in horizontal-branch stars by cosmions or by any other novel mode of energy transfer induces thermal relaxation oscillations with a period of about 500,000 yr, corresponding to the core Kelvin-Helmholtz time scale. These thermal pulses can be understood analytically in terms of a simple two-zone model. Observationally, the brightness and brightness dispersion of horizontal-branch stars increases, the periods of RR Lyrae stars change over a pulsation time scale, and the duration of central helium burning slightly decreases. None of these effects is in conflict with observations but, on the contrary, point to a speculative resolution of the age problem for globular clusters and to an alternative explanation of the period fluctuations of RR Lyrae stars.
Bouquet Alain
Dearborn David
Raffelt Georg
Salati Pierre
Silk Joseph
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