Astronomy & Astrophysics, 320, 525, (1997)
From our fitting results we find a very good correlation between the X-ray surface flux and the maximum coronal temperature with the functional form F_x ~ T_max^(2.2 +- 0.2). This correlation extends over several orders of magnitude and is valid for the very young T Tauri stars as well as for the much older young main sequence stars in our sample. Since the X-ray surface flux is a good measure of the stellar activity and shows a clear dependence on the stellar rotational velocity, the correlation means that the coronal temperature is related to the X-ray activity and ultimately determined by stellar rotation.
Finally, we interpret our results with a simple analytic loop model and find that the coronae of the active young stars are probably dominated by loops with generally higher pressure as compared to typical solar active region loops.
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