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The chromospheric age dependence of the birthrate, composition, motions, and rotation of late F and G dwarfs within 25 parsecs of the sun
Barry, Don C.
AA(Southern California, University, Los Angeles)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 334, Nov. 1, 1988, p. 436-448. (ApJ Homepage)
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NASA/STI Keywords:
Chromosphere, Dwarf Stars, Late Stars, Star Formation, Stellar Composition, Stellar Rotation, F Stars, G Stars, Stellar Motions
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Chromospheric ages are calculated for 115 stars. Reported uncertainties of about 10% in the Vaughan-Preston S values lead to accidental errors in the calculated ages ranging from about 50% at 3×108yr to about 15% at 1010yr. Rotational velocities are plotted against chromospheric age to reveal the rotational spin-down trajectories of solar-type stars of various masses. Also, the stellar birthrate, the [Fe/H] ratios, and the peculiar velocities of the sample stars are presented as a function of chromospheric age. The results confirm that a star's rotation depends only on its mass and age. The smooth, continuous decline of both a star's rotation and its activity across the Vaughan-Preston gap is demonstrated. The simples and only remaining tenable interpretation of the gap is that it is caused by time variations in the stellar birthrate.

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