Activity in early F-type stars in the Hyades

Details Activity in early F-type stars in the Hyades Activity in early F-type stars in the Hyades

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pasp...99..957w&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 99, Sept. 1987, p. 957-960.

Astronomy and Astrophysics

Astronomy

12

Early Stars, F Stars, Stellar Activity, Stellar Coronas, Stellar Evolution, Stellar Magnetic Fields, Stellar Rotation, Cool Stars, High Temperature

Scientific paper

Observations of the equivalent width of D3 He I A 5876 in 14 main-sequence stars in the Hyades show that stellar activity in these stars is closely similar to that seen in early F-type field stars. The onset of activity occurs at about (B - V) = 0.30 m, and the activity level in stars bluer than (B - V) = 0.45 m does not correlate with rotation. There is no evidence of a decline of activity with increasing age during the rather narrow time interval spanned by the main-sequence lifetimes of early F-type stars. The sharp minimum in lithium abundance that is seen in Hyades stars of middle F spectral type occurs at about the color that marks the boundary between temperature regimes where activity does and does not correlate with rotation.

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