Ardila, D. R. and Johns-Krull, C. M. (2009) A Consistent Model of the Accretion Shock Region in Classical T Tauri Stars. In: AIP Conference Proceedings. American Institute of Physics , pp. 309-312. ISBN 978-0-7354-0627-8 http://resolver.caltech.edu/CaltechAUTHORS:20100510-142047910
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We develop a consistent model of the accretion shock region in Classical T Tauri Stars (CTTSs). The initial conditions of the post-shock flow are determined by the irradiated shock precursor and the ionization state is calculated without assuming ionization equilibrium. Comparison with observations of the C IV resonance lines (λλ 1550 Å) for CTTSs indicate that the post-shock emission predicted by the model is too large, for a reasonable range of parameters. If the model is to reproduce the observations, C IV emission from CTTSs has to be dominated by pre-shock emission, for stars with moderate to large accretion rates. For stars with low accretion rates, the observations suggest a comparable contribution between the pre- and post-shock regions. These conclusions are consistent with previous results indicating that the post-shock will be buried under the stellar photosphere for moderate to large accretion rates.
|Item Type:||Book Section|
|Additional Information:||© 2009 American Institute of Physics. Calculations of the pre-shock structure were performed with version 07.02.00 of Cloudy . Calculations of the post-shock structure were performed with CHIANTI v.5.2.1. CHIANTI is a collaborative project involving the NRL (USA), RAL (UK), and the following Univerisities: College London (UK), Cambridge (UK), George Mason (USA), and Florence (Italy).|
|Subject Keywords:||Line: formation; Shock waves; Stars: formation, circumstellar matter|
|Classification Code:||PACS: 97.21.+a, 97.10.Ex, 97.10.Bt|
|Official Citation:||A Consistent Model of the Accretion Shock Region in Classical T Tauri Stars D. R. Ardila and C. M. Johns-Krull, AIP Conf. Proc. 1094, 309 (2009), DOI:10.1063/1.3099107|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||01 Jun 2010 15:51|
|Last Modified:||26 Dec 2012 12:01|
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