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dc.contributor.authorJohns-Krull, Christopher M.
Chen, Wei
Valenti, Jeff A.
Jeffers, Sandra V.
Piskunov, Nikolai E.
Kochukhov, Oleg
Makaganiuk, V.
Stempels, H.C.
Snik, Frans
Keller, Christoph
Rodenhuis, M.
dc.date.accessioned 2013-03-13T19:47:30Z
dc.date.available 2014-03-19T05:10:04Z
dc.date.issued 2013
dc.identifier.citation Johns-Krull, Christopher M., Chen, Wei, Valenti, Jeff A., et al.. "Magnetically Controlled Accretion on the Classical T Tauri Stars GQ Lupi and TQ Hydrae." The Astrophysical Journal, 765, (2013) The American Astronomical Society: 11-22. http://dx.doi.org/10.1088/0004-637X/765/1/11.
dc.identifier.urihttps://hdl.handle.net/1911/70574
dc.description.abstract We 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.
dc.language.iso eng
dc.publisher The American Astronomical Society
dc.rights Article 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.
dc.title Magnetically Controlled Accretion on the Classical T Tauri Stars GQ Lupi and TQ Hydrae
dc.type Journal article
dc.citation.journalTitle The Astrophysical Journal
dc.subject.keywordbreast cancer
brain metastasis
gold-silica nanoshell
nanoparticle
blood–brain barrier
dc.citation.volumeNumber 765
dc.embargo.terms 1 year
dc.type.dcmi Text
dc.identifier.doihttp://dx.doi.org/10.1088/0004-637X/765/1/11
dc.type.publication publisher version
dc.citation.firstpage 11
dc.citation.lastpage 22


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