Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...253..745w&link_type=abstract
Astrophysical Journal, Part 1, vol. 253, Feb. 15, 1982, p. 745-751.
Astronomy and Astrophysics
Astrophysics
119
Dwarf Stars, Late Stars, Stellar Coronas, Stellar Radiation, Stellar Rotation, X Rays, Curve Fitting, Dynamo Theory, G Stars, Least Squares Method, Magnetic Flux, Radiant Flux Density, Stellar Luminosity
Scientific paper
While it has previously been claimed that X-ray luminosity, or surface flux, varies as a power of the rotational velocity in G dwarfs, it is demonstrated that a single power law does not provide an acceptable fit to all the data. The data are describable by a power law, with a break in slope near a 12-day period which occurs at the same rotational period as the bifurcation in Vaughan and Preston's (1980) chromospheric study of G dwarfs. It is speculated that the two breaks are both related and due to a change in the stellar dynamo mode, which, at a rotation period of 12 days, corresponds to an age of one billion years for single G dwarfs.
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