2007A&A...465L...5A -
Astronomy and Astrophysics, volume 465, L5-8 (2007/4-1)
X-ray emission from MP Muscae: an old classical T Tauri star.
ARGIROFFI C., MAGGIO A. and PERES G.
Abstract (from CDS):
We study the properties of X-ray emitting plasma of
MP Mus, an old classical T Tauri star. We check whether an accretion process could produce the observed X-ray emission and we derive the accretion parameters and the characteristics of the shock-heated plasma. We compare the properties of
MP Mus with those of younger classical T Tauri stars to test whether age is related to the properties of the X-ray emitting plasma. XMM-Newton X-ray spectra allow us to measure plasma temperatures, abundances, and electron density. The density of cool plasma probes whether X-ray emission is produced by plasma heated in the accretion process. X-ray emission from
MP Mus originates from high density cool plasma but a hot flaring component is also present, suggesting that both coronal magnetic activity and accretion contribute to the observed X-ray emission. We find a Ne/O ratio similar to that observed in the much younger classical T Tauri star
BP Tau. From the soft part of the X-ray emission, mostly produced by plasma heated in the accretion shock, we derive a mass accretion rate of 5x10
–11M
☉/yr.
Abstract Copyright:
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Journal keyword(s):
stars: abundances - stars: circumstellar matter - stars: coronae - stars: individual: MP Muscae - stars: pre-main sequence - X-rays: stars
Simbad objects:
10
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