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A Consistent Model of the Accretion Shock Region in Classical T Tauri Stars

Ardila, D. R. and Johns-Krull, C. M. (2009) A Consistent Model of the Accretion Shock Region in Classical T Tauri Stars. In: Cool Stars, Stellar Systems and The Sun: Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun. AIP Conference Proceedings. No.1094. American Institute of Physics , Melville, NY, pp. 309-312. ISBN 978-0-7354-0627-8.

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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
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Additional Information:© 2009 American Institute of Physics. Calculations of the pre-shock structure were performed with version 07.02.00 of Cloudy [4]. 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
Series Name:AIP Conference Proceedings
Issue or Number:1094
Classification Code:PACS: 97.21.+a, 97.10.Ex, 97.10.Bt
Record Number:CaltechAUTHORS:20100510-142047910
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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.
ID Code:18222
Deposited By: Tony Diaz
Deposited On:01 Jun 2010 15:51
Last Modified:03 Oct 2019 01:39

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