X-ray spectroscopy of the nearby, classical T Tauri star TW Hydrae

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Title: X-ray spectroscopy of the nearby, classical T Tauri star TW Hydrae
Author: Kastner, Joel; Huenemoerder, David; Schulz, Norbert; Weintraub, David
Abstract: We present ASCA and ROSAT X-ray observations of the classical T Tauri star TW Hya, the namesake of a small association that, at a distance of ~50 pc, represents the nearest known region of recent star formation. Analysis of ASCA and ROSAT spectra indicates characteristic temperatures of ~1.7 and ~9.7 MK for the X-ray emitting region(s) of TW Hya, with emission lines of highly ionized Fe dominating the spectrum at energies of ~1 keV. The X-ray data show variations in X-ray flux on timescales of ~<1 hr as well as indications of changes in the X-ray absorbing column on timescales of several years, suggesting that flares and variable obscuration are responsible for the large-amplitude optical variability of TW Hya on short and long timescales, respectively. Comparison with model calculations suggests that TW Hya produces sufficient hard X-ray flux to produce significant ionization of molecular gas within its circumstellar disk; such X-ray ionization may regulate both protoplanetary accretion and protoplanetary chemistry (Refer to PDF file for exact formulas).
Description: Also archived in: arXiv: astro-ph/9905126 v2 25 May 1999
Record URI: http://hdl.handle.net/1850/1869
Date: 1999-11-10

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