Analysis of variability of TW Hya as observed by MOST and ASAS in 2009

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dc.creator Siwak, Michal
dc.creator Rucinski, Slavek M.
dc.creator Matthews, Jaymie M.
dc.creator Pojmanski, Grzegorz
dc.creator Kuschnig, Rainer
dc.creator Guenther, David B.
dc.creator Moffat, Anthony F. J.
dc.creator Sasselov, Dimitar
dc.creator Weiss, Werner W.
dc.date.accessioned 2018-06-11T12:38:08Z
dc.date.available 2018-06-11T12:38:08Z
dc.date.issued 2011-02
dc.identifier.issn 0035-8711
dc.identifier.uri http://library2.smu.ca/handle/01/27546
dc.description Publisher's Version/PDF
dc.description.abstract As a continuation of our previous studies in 2007 and 2008, new photometric observations of the T Tauri star TW Hya obtained by the MOST satellite and the All Sky Automated Survey (ASAS) project over 40 d in 2009 with temporal resolution of 0.2 d are presented. A wavelet analysis of the combined MOST&ndash;ASAS data provides a rich picture of coherent, intermittent, variable-period oscillations, similarly as discovered in the 2008 data. The periods (1.3&ndash;10 d) and systematic period shortening on time-scales of weeks can be interpreted within the model of magnetorotationally controlled accretion processes in the inner accretion disc around the star. Within this model and depending on the assumed visibility of plasma parcels causing the oscillations, the observed shortest oscillation period may indicate the stellar rotation period of 1.3 or 2.6 d, synchronized with the disc at 4.5 or 7.1 R<sub>☉</sub>, respectively. en_CA
dc.language.iso en en_CA
dc.publisher Wiley-Blackwell en_CA
dc.relation.uri https://dx.doi.org/10.1111/j.1365-2966.2010.17649.x
dc.rights This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2010 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
dc.subject.lcsh T Tauri stars
dc.subject.lcsh Accretion (Astrophysics)
dc.subject.lcsh Stars -- Rotation
dc.title Analysis of variability of TW Hya as observed by MOST and ASAS in 2009 en_CA
dc.type Text en_CA
dcterms.bibliographicCitation Monthly Notices of the Royal Astronomical Society 410(4), 2725-2729. (2011) en_CA


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This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2010 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
 
Published Version: https://dx.doi.org/10.1111/j.1365-2966.2010.17649.x
 
 

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