Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2010-10-04
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
Proceedings SF2A-2010: Meeting held in Marseille, France. June 21-25, 2010. Eds: S. Boissier, M. Heydari-Malayeri, R. Samadi a
Scientific paper
We present an analytical study of a large sample of ~109 young stellar objects in the X-ray. Our objects were detected in X-ray independent of age. Unexpectedly, the X-ray energy is somewhat correlated with the ages. It decreases with time and with column density, while it should increase. We conclude that the youngest protostars, Class 0/I, emit X-rays in the 1-8 keV band. The deeply embedded sources with the strongest accretion activity are detected in the hard-band (> 2keV) only. Due to extinction, their soft X-rays are not detected. To explain the decline in energy, we suggest that within a timescale of few Myrs the corona cools down via the accretion material.
Hamidouche Murad
Jacobson Magnus
Looney Leslie W.
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