Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-11-27
Astronomy and Astrophysics
Astrophysics
To be published in "Stellar Clusters and Associations", eds. T. Montmerle and P. Andre' (ASP Conf. Ser.), 6 pages, 5 figures,
Scientific paper
We present the initial results of a study aimed at computing the global effects of the X-ray ionization due to young stars within a molecular cloud that forms stars with a standard IMF at a rate accelerating with time. We model the gas distribution of the cloud as a fractal of dimension 2.3. We introduce the concept of a "Roentgen sphere" as the region around each PMS star where the ionization rate due to stellar X-rays exceeds that due to interstellar cosmic rays. Using values of the X-ray luminosity typical of T Tauri stars, we find that within the Roentgen radius the average ionization rate is increased by a factor 4 to 20 with respect to the value obtained from cosmic-rays.
Lorenzani Andrea
Palla Francesco
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