English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We present high-resolution X-ray spectra of the multiple T Tauri star systemHen 3-600, obtained with the High Energy Transmission Grating Spectrograph onthe Chandra X-ray Observatory. Two binary components were detected in thezeroth-order image. Hen 3-600-A, which has a large mid-infrared excess, is a2-3 times fainter in X-rays than Hen 3-600-B, due to a large flare on B. Thedispersed X-ray spectra of the two primary components overlap spatially;spectral analysis was performed on the combined system. Analysis of theindividual spectra was limited to regions where the contributions of A and Bcan be disentangled. This analysis results in two lines of evidence indicatingthat the X-ray emission from Hen 3-600 is derived from accretion processes:line ratios of O VII indicate that the characteristic density of itsX-ray-emitting plasma is large; a significant component of low-temperatureplasma is present and is stronger in component A. These results are consistentwith results obtained from X-ray gratings spectroscopy of more rapidlyaccreting systems. All of the signatures of Hen 3-600 that are potentialdiagnostics of accretion activity -- X-ray emission, UV excess, H-alphaemission, and weak infrared excess -- suggest that its components represent atransition phase between rapidly accreting, classical T Tauri stars andnon-accreting, weak-lined T Tauri stars.

Evidence for Accretion in the High-resolution X-ray Spectrum of the T Tauri Star System Hen 3-600