Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.292..252j&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 292, p. 252
Astronomy and Astrophysics
Astronomy
36
X Ray Stars, Chromosphere, Metallicity, Open Clusters, Stellar Rotation, Stellar Activity, Early Stars, Lithium, Stellar Spectrophotometry, G Stars
Scientific paper
Radial and rotational velocities, chromospheric activity, and lithium abundances are presented for an X-ray-selected sample of stars in the young (220 Myr) open cluster NGC 6475. Low-mass members of the cluster have been identified on the basis of photometric and spectroscopic criteria. The observations show that the rapid spindown seen among solar-type stars in the Pleiades is incomplete at 220 Myr, as there are F, G, and K stars in NGC 6475 with v sin i greater than 10 km/s. Peak rotation rates for G stars are 12-14 km/s, and are robust to uncertain inclination angles, because the magnetic activity of these stars is less than the saturation value observed for fast rotators in the Pleiades. Two mid-K stars are found with v sin i about 25 km/s and with saturated magnetic activity levels, indicating that spindown time-scales are mass-dependent, increasing from about 20 Myr for early-G stars to greater than 75 Myr for mid-K stars.
James David J.
Jeffries Robin D.
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