Magnetically Controlled Accretion on the Classical T Tauri Stars GQ Lupi and TQ Hydrae

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dc.citation.firstpage11en_US
dc.citation.journalTitleThe Astrophysical Journalen_US
dc.citation.lastpage22en_US
dc.citation.volumeNumber765en_US
dc.contributor.authorJohns-Krull, Christopher M.en_US
dc.contributor.authorChen, Weien_US
dc.contributor.authorValenti, Jeff A.en_US
dc.contributor.authorJeffers, Sandra V.en_US
dc.contributor.authorPiskunov, Nikolai E.en_US
dc.contributor.authorKochukhov, Olegen_US
dc.contributor.authorMakaganiuk, V.en_US
dc.contributor.authorStempels, H.C.en_US
dc.contributor.authorSnik, Fransen_US
dc.contributor.authorKeller, Christophen_US
dc.contributor.authorRodenhuis, M.en_US
dc.date.accessioned2013-03-13T19:47:30Zen_US
dc.date.available2014-03-19T05:10:04Zen_US
dc.date.issued2013en_US
dc.description.abstractWe present high spectral resolution (R ≈ 108,000) Stokes V polarimetry of the classical T Tauri stars (CTTSs) GQ Lup and TW Hya obtained with the polarimetric upgrade to the HARPS spectrometer on the ESO 3.6 m telescope. We present data on both photospheric lines and emission lines, concentrating our discussion on the polarization properties of the He i emission lines at 5876 Å and 6678 Å. The He i lines in these CTTSs contain both narrow emission cores, believed to come from near the accretion shock region on these stars, and broad emission components which may come from either a wind or the large-scale magnetospheric accretion flow.We detect strong polarization in the narrow component of the two He i emission lines in both stars. We observe a maximum implied field strength of 6.05 ± 0.24 kG in the 5876 Å line of GQ Lup, making it the star with the highest field strength measured in this line for a CTTS. We find field strengths in the two He i lines that are consistent with each other, in contrast to what has been reported in the literature on at least one star. We do not detect any polarization in the broad component of the He i lines on these stars, strengthening the conclusion that they form over a substantially different volume relative to the formation region of the narrow component of the He i lines.en_US
dc.embargo.terms1 yearen_US
dc.identifier.citationJohns-Krull, Christopher M., Chen, Wei, Valenti, Jeff A., et al.. "Magnetically Controlled Accretion on the Classical T Tauri Stars GQ Lupi and TQ Hydrae." <i>The Astrophysical Journal,</i> 765, (2013) The American Astronomical Society: 11-22. http://dx.doi.org/10.1088/0004-637X/765/1/11.en_US
dc.identifier.doihttp://dx.doi.org/10.1088/0004-637X/765/1/11en_US
dc.identifier.urihttps://hdl.handle.net/1911/70574en_US
dc.language.isoengen_US
dc.publisherThe American Astronomical Societyen_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.subject.keywordbreast canceren_US
dc.subject.keywordbrain metastasisen_US
dc.subject.keywordgold-silica nanoshellen_US
dc.subject.keywordnanoparticleen_US
dc.subject.keywordblood–brain barrieren_US
dc.titleMagnetically Controlled Accretion on the Classical T Tauri Stars GQ Lupi and TQ Hydraeen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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