Young Cool Stars in the Solar Neighborhood.

Details Young Cool Stars in the Solar Neighborhood. Young Cool Stars in the Solar Neighborhood.

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....114.1673s&link_type=abstract

The Astronomical Journal, v. 114, p. 1673.

Astronomy and Astrophysics

Astronomy

35

Solar Neighborhood, Stars: Chromospheres, X-Rays: Stars

Scientific paper

We present evidence for a bimodal distribution of the coronal activity for a sample of 802 cool (B - V> 0.5) stars within 25 pc of the Sun. The X-ray data obtained during the ROSAT all-sky survey resemble a characteristic activity gap found in former surveys of Ca II H+K chromospheric emission. Coronal activity as expressed with log Lx/Lbol is shown to correlate with the chromospheric activity indicator RH′HK. The coronally most active objects also exhibit the largest Li I equivalent widths and are probably young. Our observations suggest that we can efficiently single out the youngest objects in the vicinity of the Sun on the basis of their characteristic levels of coronal activity. Young, late-type stars are abundant in the solar neighborhood.

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