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| Paper: |
Cool Young Stars in the Solar Neighbourhood |
| Volume: |
154, Cool Stars, Stellar Systems and the Sun: Tenth Cambridge Workshop |
| Page: |
1339 |
| Authors: |
Sterzik, Michael F.; Schmitt, Jurgen H. M. M. |
| Abstract: |
We present evidence for a bimodal distribution of the coronal activity for a sample of 802 cool 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 2 H+K chromospheric emission. The statistical significance of the X-ray gap is tested in the color range 1.3 < B-V < 1.6. The coronally most active objects also exhibit the largest Li 1 equivalent widths, indicative of their youth. We discuss examples of coronally active pre-main sequence field stars within our sample. Our observations suggest that we can efficiently single out the youngest objects in the vicinity of the sun on the basis of their charcteristic levels of coronal activity. Young, late-type stars appear to be more abundant in the solar neighbourhood than previously suspected. |
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