Magnetic Fields and Accretion on T Tauri Stars

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dc.contributor.advisorJohns-Krull, Christopher Men_US
dc.contributor.committeeMemberHartigan, Patrick Men_US
dc.contributor.committeeMemberLenardic, Adrianen_US
dc.creatorChen, Weien_US
dc.date.accessioned2016-01-06T21:07:23Zen_US
dc.date.available2016-01-06T21:07:23Zen_US
dc.date.created2015-05en_US
dc.date.issued2015-04-20en_US
dc.date.submittedMay 2015en_US
dc.date.updated2016-01-06T21:07:24Zen_US
dc.description.abstractIn this thesis, we study magnetic properties of Classical T Tauri Stars (CTTSs) using diffferent analysis methods from different angles. We first implement a least-squares deconvolution (LSD) code to enhance the signal-to-noise ratio of the observed data and therefore the ability to detect weak magnetic signatures in the polarized spectra. We compare our code to another LSD code by analyzing the same spectra with the same line list, and the good agreement confirms that our code performs similarly with other state of the art LSD codes. We have also tested the instrument we use to collect the spectropolarimetric data presented in this thesis. The intrument do produce spurious signals but at a very low level, posing no problem in our analysis. The polarization efficiency of the instrument is also high. We then studied the CTTS BP Tau and found field configuration not consistent with other results in the literature, which may simply be due to the temporal variability given the observations were taken 8 years apart. Next, we detect extremely high levels of polarization on TW Hya in the 2013 epoch, which motivated us do a thorough magnetic variability study. We find that the field geometry does have changed, indicating a dynamo origin of these fields. We also try to use the rotational modulation of 6 CTTSs to locate the accretion spots. Some of the stars have shown definte change over the years while some remain similar.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationChen, Wei. "Magnetic Fields and Accretion on T Tauri Stars." (2015) Diss., Rice University. <a href="https://hdl.handle.net/1911/87739">https://hdl.handle.net/1911/87739</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/87739en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subjectMagnetic Fieldsen_US
dc.subjectAccretionen_US
dc.subjectT Tauri Starsen_US
dc.subjectStar Formationen_US
dc.titleMagnetic Fields and Accretion on T Tauri Starsen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentPhysics and Astronomyen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophyen_US
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