Aims: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. Methods: 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. Results: 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 5×10^-11 M_sun yr^-1.

ARGIROFFI C, MAGGIO A, & PERES G (2007). X-ray emission from MP Muscae: an old classical T Tauri star. ASTRONOMY & ASTROPHYSICS, 465, L5-L8 [10.1051/0004-6361:20067016].

X-ray emission from MP Muscae: an old classical T Tauri star

ARGIROFFI, Costanza;PERES, Giovanni
2007

Abstract

Aims: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. Methods: 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. Results: 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 5×10^-11 M_sun yr^-1.
Settore FIS/05 - Astronomia E Astrofisica
ARGIROFFI C, MAGGIO A, & PERES G (2007). X-ray emission from MP Muscae: an old classical T Tauri star. ASTRONOMY & ASTROPHYSICS, 465, L5-L8 [10.1051/0004-6361:20067016].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10447/27503
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