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Title:
Multisite observations of SU Aurigae
Authors:
Unruh, Y. C.; Donati, J.-F.; Oliveira, J. M.; Collier Cameron, A.; Catala, C.; Henrichs, H. F.; Johns-Krull, C. M.; Foing, B.; Hao, J.; Cao, H.; Landstreet, J. D.; Stempels, H. C.; de Jong, J. A.; Telting, J.; Walton, N.; Ehrenfreund, P.; Hatzes, A. P.; Neff, J. E.; Böhm, T.; Simon, T.; Kaper, L.; Strassmeier, K. G.; Granzer, Th.
Affiliation:
AA(Astrophysics Group, Blackett Laboratory, Imperial College of Science, Technology and Medicine, London SW7 2BW), AB(Laboratoire d'Astrophysique de l'Observatoire Midi-Pyrénées, Toulouse, France), AC(Space Science Division, ESTEC/ESA, Nordwijk, the Netherlands; School of Chemistry and Physics, Keele University, Staffordshire ST5 5BG), AD(School of Physics and Astronomy, University of St Andrews, Fife KY16 9SS), AE(Laboratoire d'Astrophysique de l'Observatoire Midi-Pyrénées, Toulouse, France), AF(Astronomical Institute 'Anton Pannekoek', University of Amsterdam, the Netherlands), AG(Department of Physics and Astronomy, Rice University, Houston, TX 77005, USA), AH(Space Science Division, ESTEC/ESA, Nordwijk, the Netherlands), AI(Chinese Academy of Sciences, Beijing Astronomical Observatory, China), AJ(Chinese Academy of Sciences, Beijing Astronomical Observatory, China), AK(Department of Physics and Astronomy, University of Western Ontario, London, Ontario N6A 3K7, Canada), AL(Department of Astronomy and Space Physics, Box 515, SE-75120 Uppsala, Sweden), AM(Leiden Observatory, PO Box 9513, 2300 RA Leiden, the Netherlands), AN(Nordic Optical Telescope, Apartado 474, 38700 Santa Cruz de La Palma, Spain), AO(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA), AP(Leiden Observatory, PO Box 9513, 2300 RA Leiden, the Netherlands), AQ(Department of Astronomy, The University of Texas at Austin, Austin, TX 78712, USA; Thüringer Landessternwarte Tautenburg, Karl-Schwarzschild-Observatorium, D-07778 Tautenburg, Germany), AR(Department of Physics and Astronomy, College of Charleston, Charleston, SC 29424, USA), AS(Laboratoire d'Astrophysique de l'Observatoire Midi-Pyrénées, Toulouse, France), AT(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA), AU(Astronomical Institute 'Anton Pannekoek', University of Amsterdam, the Netherlands), AV(Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany), AW(Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 348, Issue 3, pp. 1301-1320. (MNRAS Homepage)
Publication Date:
03/2004
Origin:
MNRAS
Astronomy Keywords:
stars: imaging, stars: individual: SU Aur, stars: magnetic fields, stars: pre-main-sequence
DOI:
10.1111/j.1365-2966.2004.07445.x
Bibliographic Code:
2004MNRAS.348.1301U

Abstract

We present results from the 1996 Multi-Site Continuous Spectroscopy (MUSICOS) campaign on the T Tauri star SU Aurigae. We find a 2.7-d periodicity in the HeI (587.6 nm) line, and somewhat longer, less well-pronounced periodicities in the Balmer lines and in Na D. Our observations support the suggestion that the wind and infall signatures are out of phase on SU Aur. We present Doppler images of SU Aur that have been obtained from least-squares deconvolved profiles. Images taken about one rotation apart show only limited overlap, in particular at low latitudes. This is due in part to limitations in signal-to-noise ratio, and in part to line-profile deformations that arise from short-lived and/or non-surface features. The agreement at high latitudes is better and suggests that at least some longer-lived features are present. The analysis of Stokes V profiles yields a marginal magnetic field detection during one of the phases.

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