Evidence for accretion: high-resolution X-ray spectroscopy of the classical T Tauri star TW Hydrae

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Title: Evidence for accretion: high-resolution X-ray spectroscopy of the classical T Tauri star TW Hydrae
Author: Kastner, Joel; Huenemoerder, David; Schulz, Norbert; Canizares, Claude; Weintraub, David
Abstract: We present high resolution X-ray spectra of the X-ray bright classical T Tauri star, TW Hydrae, covering the wavelength range of 1.5-25 °A. The differential emission measure derived from fluxes of temperature-sensitive emission lines shows a plasma with a sharply peaked temperature distribution, peaking at log T = 6.5. Abundance anomalies are apparent, with iron very deficient relative to oxygen, while neon is enhanced relative to oxygen. Density-sensitive line ratios of Ne ix and O vii indicate densities near (log ne)=13. A flare with rapid (~1 ks) rise time was detected during our 48 ksec observation; however, based on analysis of the emission-line spectrum during quiescent and flaring states, the derived plasma parameters do not appear strongly time-dependent. The inferred plasma temperature distribution and densities are consistent with a model in which the bulk of the X-ray emission from TW Hya is generated via mass accretion from its circumstellar disk. Assuming accretion powers the X-ray emission, our results for (log ne) suggest an accretion rate of ~10^−8M⊙ yr^−1 (Refer to PDF file for exact formulas).
Description: Also archived in: arXiv: astro-ph/0111049 v1 2 Nov 2001
Record URI: http://hdl.handle.net/1850/1860
Date: 2002-03-01

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