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| Paper: |
Radio Emission from ROSAT Discovered Young Stars in and Around Taurus-Auriga |
| Volume: |
154, Cool Stars, Stellar Systems and the Sun: Tenth Cambridge Workshop |
| Page: |
1001 |
| Authors: |
Carkner, Lee; Mamajek, Eric; Feigelson, Eric; Neuhauser, Ralph; Wichmann, Rainer; Krautter, Joachim |
| Abstract: |
An 8.4 GHz VLA survey of 91 recently discovered lithium-rich late-type stars from the ROSAT All-Sky Survey and pointed observations is presented. These objects lie in the vicinity of the Taurus-Auriga star-forming region (d ~= 140 pc), however some are dispersed nearly 30 deg from known active star-forming cloud cores. This sample represents a spatially-complete, flux-limited population of X-ray bright young stars both within and away from the primary Tau-Aur stellar nurseries. Of the 91 sources, 29 are detected in this radio survey with a sensitivity limit of ~0.15 mJy. If they are at the distance of the star forming clouds, we find 32% of widely distributed young stars with LX >= 5 x 1028 ergs s^{-1} have radio luminosity densities in excess of 3.5 x 1015 erg s^{-1} Hz^{-1}. This detection rate, the ranges of radio and X-ray luminosities and LR/LX ratios are consistent with known young weak-lined T Tauri stars (ages ~106 yr) which reside within the Taurus molecular clouds, but is considerably higher than a zero-age main sequence population such as the Pleiades (age ~= 7 x 107 yr). The radio properties thus support the pre-main sequence classification of the stars. They fit well among other active young stars on the empirical LR vs. LX diagram, implying that solar type gyro-synchrotron activity is the radio emission mechanism. |
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