Rotation and activity among solar-type stars of the Ursa Major Group

Details Rotation and activity among solar-type stars of the Ursa Major Group Rotation and activity among solar-type stars of the Ursa Major Group

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...402l...5s&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 402, no. 1, p. L5-L8.

Astronomy and Astrophysics

Astronomy

42

Dwarf Stars, G Stars, K Stars, Star Clusters, Stellar Activity, Stellar Rotation, Chromosphere, Emission Spectra, Spaceborne Astronomy, Stellar Atmospheres, Stellar Evolution

Scientific paper

We examine rotation and chromospheric activity among G and K dwarfs recently shown to be members of the Ursa Major Group (UMaG). Rotation periods for UMaG stars are smaller than for stars of the same colors in the Hyades, and by an amount corresponding to the Skumanich relation. Most UMaG stars have about the same level of Ca II and K emission, implying that they also have nearly uniform intrinsic rotation rates. That means that the diversity of rotation rates and levels of activity seen among solar-type stars in the Alpha Persei and Pleiades clusters has largely converged by the age of UMaG (0.3 Gyr).

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