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

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dc.contributor.author Kastner, Joel en_US
dc.contributor.author Huenemoerder, David en_US
dc.contributor.author Schulz, Norbert en_US
dc.contributor.author Canizares, Claude en_US
dc.contributor.author Weintraub, David en_US
dc.date.accessioned 2006-05-23T15:01:46Z en_US
dc.date.available 2006-05-23T15:01:46Z en_US
dc.date.issued 2002-03-01 en_US
dc.identifier.citation Astrophys.J. 567 (2002) 434-440 en_US
dc.identifier.issn 1538-4365 en_US
dc.identifier.uri http://hdl.handle.net/1850/1860 en_US
dc.description Also archived in: arXiv: astro-ph/0111049 v1 2 Nov 2001 en_US
dc.description.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). en_US
dc.description.sponsorship The authors wish to thank Eric Feigelson, Andrea Dupree, and Steve Beckwith for incisive comments and enlightening discussions. This research was supported in part by contracts SV-61010 and NA-39073 to MIT. en_US
dc.format.extent 247757 bytes en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en_US en_US
dc.publisher Astrophysical Journal en_US
dc.relation.ispartofseries vol. 567 en_US
dc.relation.ispartofseries no. 1 en_US
dc.subject Circumstellar matter en_US
dc.subject Stars - formation en_US
dc.subject Stars - individual - TW Hydrae en_US
dc.subject X-rays - stars en_US
dc.title Evidence for accretion: high-resolution X-ray spectroscopy of the classical T Tauri star TW Hydrae en_US
dc.type Article en_US

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