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Magnetic field at the inner disk edge

Published online by Cambridge University Press:  01 May 2007

Moira Jardine ,
Scott G. Gregory  and
Jean-François Donati
Moira Jardine
Affiliation:
SUPA, School of Physics and Astronomy, North Haugh, St Andrews, UK, KY16 9SS email: mmj@st-andrews.ac.uk, sg64@st-andrews.ac.uk
Scott G. Gregory
Affiliation:
SUPA, School of Physics and Astronomy, North Haugh, St Andrews, UK, KY16 9SS email: mmj@st-andrews.ac.uk, sg64@st-andrews.ac.uk
Jean-François Donati
Affiliation:
Laboratoire dAstrophysique, Observatoire Midi-Pyrénées, 14 Av. E. Belin, F-31400 Toulouse, France email: donati@ast.obs-mip.fr
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Abstract

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Our present understanding of the coronal structure of T Tauri stars is fragmentary and observations in different wavelength regimes often appear to give contradictory results. X-ray data suggest the presence of magnetic loops on a variety of scales, from compact loops of size less than a stellar radius, up to very large loops of up to 10 stellar radii which may connect to the disk. While some stars show a clear rotational modulation in X-rays, implying distinct bright and dark regions, many do not. This picture is complicated by the accretion process itself, which also contributes to the X-ray emission. The location of the inner edge of the accretion disk and the nature of the magnetic field there are still hotly-contested issues. Accretion indicators often suggest the presence of discrete accretion funnels. This has implications for the structure of the corona, as does the presence of an outflowing wind. All of these factors are linked to the structure of the magnetic field, which we are now beginning to unravel through Zeeman-Doppler imaging. In this review I will describe the present state of our understanding of the magnetic structure of T Tauri coronae and the impact this has during such an early evolutionary stage.

Keywords

Stars:coronae
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S243: Star-Disk Interaction in Young Stars , May 2007 , pp. 51 - 62
Copyright
Copyright © International Astronomical Union 2007

References

Altschuler, M. D. & Newkirk, G. Jr. 1969, Solar Phys., 9, 131CrossRefGoogle Scholar
Argiroffi, C., Maggio, A., Peres, G. 2007, A&A, 465, L5Google Scholar
Benz, A. O. & Guedel, M. 1994, A&A, 285, 621Google Scholar
Bouvier, J., Alencar, S. H. P., Harries, T. J., Johns-Krull, C. M., Romanova, M. M. 2007, in Protostars and Planets V, ed. Reipurth, B., Jewitt, D., & Keil, K., 479–494Google Scholar
Caramazza, M., Flaccomio, E., Micela, G. et al. , 2007, ArXiv e-prints, 706Google Scholar
Donati, J.-F., Collier Cameron, A., Hussain, G., Semel, M. 1999, MNRAS, 302, 437Google Scholar
Donati, J.-F., Forveille, T., Cameron, A. C. et al. , 2006, Science, 311, 633CrossRefGoogle Scholar
Donati, J.-F., Jardine, M. M., Gregory, S. et al. , 2007, MNRAS, submittedGoogle Scholar
Dupree, A. K., Ake, T. B., Brickhouse, N. S., Hussain, G. A. J., Jardine, M. 2006, in ASP Conf. Ser. 348: Astrophysics in the Far Ultraviolet: Five Years of Discovery with FUSE, ed. Sonneborn, G., Moos, H. W., & Andersson, B.-G., 168–+Google Scholar
Dupree, A. K., Brickhouse, N. S., Smith, G. H., Strader, J. 2005, Ap. Lett., 625, L131Google Scholar
Favata, F., Flaccomio, E., Reale, F., et al. 2005, ApJS, 160, 469CrossRefGoogle Scholar
Flaccomio, E., Micela, G., Sciortino, S., et al. 2005, ApJS, 160, 450CrossRefGoogle Scholar
Forbrich, J., Preibisch, T., Menten, K. M., et al. 2007, A&A, 464, 1003Google Scholar
Getman, K. V., Flaccomio, E., Broos, P. S., et al. 2005, ApJS, 160, 319CrossRefGoogle Scholar
Ghosh, P. & Lamb, F. 1978, ApJ, 223, L83Google Scholar
Goodson, A. P., Winglee, R. M., Boehm, K.-H. 1997, ApJ, 489, 199CrossRefGoogle Scholar
Gregory, S. G., Jardine, M., Cameron, A. C., Donati, J.-F. 2006a, MNRAS, 373, 827Google Scholar
Gregory, S. G., Jardine, M., Simpson, I., Donati, J.-F. 2006b, MNRAS, 371, 999CrossRefGoogle Scholar
Gregory, S. G., Wood, K., Jardine, M. 2007, ArXiv e-prints, 704Google Scholar
Güdel, M., Schmitt, J., Benz, A., Elias II, N. 1995, A&A, 301, 201Google Scholar
Günther, H. M., Schmitt, J. H. M. M., Robrade, J., Liefke, C. 2007, A&A, 466, 1111Google Scholar
Hussain, G., Brickhouse, N., Dupree, A., et al. 2005, ApJ, 621, 999CrossRefGoogle Scholar
Jardine, M., Cameron, A. C., Donati, J.-F., Gregory, S. G., Wood, K. 2006, MNRAS, 367, 917Google Scholar
Jardine, M., Collier Cameron, A., Donati, J.-F. 2002a, MNRAS, 333, 339CrossRefGoogle Scholar
Jardine, M., Wood, K., CollierCameron, A., Donati, J.-F., Mackay, D. H. 2002b, MNRAS, 336, 1364CrossRefGoogle Scholar
Johns-Krull, C. M., Valenti, J. A., Saar, S. H. 2004, ApJ, 617, 1204CrossRefGoogle Scholar
Kastner, J. H., Huenemoerder, D. P., Schulz, N. S., Canizares, C. R., Weintraub, D. A. 2002, ApJ, 567, 434CrossRefGoogle Scholar
Königl, A. 1991, ApJ, 370, L39CrossRefGoogle Scholar
Long, M., Romanova, M. M., Lovelace, R. V. E. 2007, MNRAS, 374, 436CrossRefGoogle Scholar
Lynden-Bell, D. & Boily, C. 1994, MNRAS, 267, 146CrossRefGoogle Scholar
Marino, A., Micela, G., Peres, G., Sciortino, S. 2003, A&A, 407, L63Google Scholar
Preibisch, T., Kim, Y.-C., Favata, F., et al. 2005, ApJS, 160, 401CrossRefGoogle Scholar
Rebull, L. M., Stauffer, J. R., Ramirez, S. V., et al. 2006, AJ, 131, 2934CrossRefGoogle Scholar
Romanova, M. M. & Lovelace, R. V. E. 2006, Ap. Lett., 645, L73CrossRefGoogle Scholar
Romanova, M. M., Ustyugova, G. V., Koldoba, A. V., Wick, J. V., Lovelace, R. V. E. 2003, ApJ, 595, 1009CrossRefGoogle Scholar
Shu, F., Najita, J., Ostriker, E., et al. 1994, ApJ, 429, 781CrossRefGoogle Scholar
Stassun, K. G., van den Berg, M., Feigelson, E. 2007, ApJ, 660, 704CrossRefGoogle Scholar
Stelzer, B. & Schmitt, J. H. M. M. 2004, A&A, 418, 687Google Scholar
Symington, N. H., Harries, T. J., Kurosawa, R., Naylor, T. 2005, MNRAS, 358, 977Google Scholar
Valenti, J. A. & Johns-Krull, C. M. 2004, Ap&SS, 292, 619Google Scholar
von Rekowski, B. & Brandenburg, A. 2004, A&A, 420, 17Google Scholar
Yang, H., Johns-Krull, C. M., Valenti, J. A. 2005, ApJ, 635, 466CrossRefGoogle Scholar
Yang, H., Johns-Krull, C. M., Valenti, J. A. 2007, AJ, 133, 73CrossRefGoogle Scholar