Doppler images and chromospheric variability of TWA 17
Identifieur interne : 000019 ( Istex/Curation ); précédent : 000018; suivant : 000020Doppler images and chromospheric variability of TWA 17
Auteurs : M. B. Skelly [France] ; Y. C. Unruh ; J. R. Barnes ; W. A. Lawson [Australie] ; J.-F. Donati [France] ; A. Collier CameronSource :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2009-11-11.
Abstract
We present Doppler imaging and a Balmer line analysis of the weak-line T Tauri star TWA 17. Spectra were taken in 2006 with the University College London Echelle Spectrograph on the Anglo-Australian Telescope. Using least-squares deconvolution to improve the effective signal-to-noise ratio, we produced a Doppler map of the surface spot distribution. This shows similar features to maps of other rapidly rotating T Tauri stars, i.e. a polar spot with more spots extending out of it down to the equator. In addition to the photospheric variability, the chromospheric variability was studied using the Balmer emission. The mean Hα profile has a narrow component consistent with rotational broadening and a broad component extending out to 220 km s−1. The variability in Hα suggests that the chromosphere has at least one slingshot prominence 3R* above the surface.
Url:
DOI: 10.1111/j.1365-2966.2009.15411.x
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M. B. Skelly<affiliation><mods:affiliation></mods:affiliation><wicri:noCountry code="syntax">???</wicri:noCountry></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: mskelly@ast.obs-mip.fr</mods:affiliation><country wicri:rule="url">France</country></affiliation><affiliation><mods:affiliation>Astrophysics Group, Imperial College of Science, Technology and Medicine, London SW7 2AZ</mods:affiliation><wicri:noCountry code="subField">2AZ</wicri:noCountry></affiliation><affiliation><mods:affiliation>Centre for Astrophysics Research, University of Hertfordshire, College Lane, Hatfield, Herts AL10 9AB</mods:affiliation><wicri:noCountry code="subField">9AB</wicri:noCountry></affiliation><affiliation><mods:affiliation>School of Physics and Astronomy, University of St Andrews, Fife KY16 9SS</mods:affiliation><wicri:noCountry code="subField">9SS</wicri:noCountry></affiliation>Le document en format XML
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C." last="Unruh">Y. C. Unruh</name><affiliation><mods:affiliation>Astrophysics Group, Imperial College of Science, Technology and Medicine, London SW7 2AZ</mods:affiliation><wicri:noCountry code="subField">2AZ</wicri:noCountry></affiliation></author><author><name sortKey="Barnes, J R" sort="Barnes, J R" uniqKey="Barnes J" first="J. R." last="Barnes">J. R. Barnes</name><affiliation><mods:affiliation>Centre for Astrophysics Research, University of Hertfordshire, College Lane, Hatfield, Herts AL10 9AB</mods:affiliation><wicri:noCountry code="subField">9AB</wicri:noCountry></affiliation></author><author><name sortKey="Lawson, W A" sort="Lawson, W A" uniqKey="Lawson W" first="W. A." last="Lawson">W. A. 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Collier Cameron</name><affiliation><mods:affiliation>School of Physics and Astronomy, University of St Andrews, Fife KY16 9SS</mods:affiliation><wicri:noCountry code="subField">9SS</wicri:noCountry></affiliation></author></analytic><monogr></monogr><series><title level="j">Monthly Notices of the Royal Astronomical Society</title><title level="j" type="abbrev">Monthly Notices of the Royal Astronomical Society</title><idno type="ISSN">0035-8711</idno><idno type="eISSN">1365-2966</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2009-11-11">2009-11-11</date><biblScope unit="volume">399</biblScope><biblScope unit="issue">4</biblScope><biblScope unit="page" from="1829">1829</biblScope><biblScope unit="page" to="1838">1838</biblScope></imprint><idno type="ISSN">0035-8711</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0035-8711</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract">We present Doppler imaging and a Balmer line analysis of the weak-line T Tauri star TWA 17. Spectra were taken in 2006 with the University College London Echelle Spectrograph on the Anglo-Australian Telescope. Using least-squares deconvolution to improve the effective signal-to-noise ratio, we produced a Doppler map of the surface spot distribution. This shows similar features to maps of other rapidly rotating T Tauri stars, i.e. a polar spot with more spots extending out of it down to the equator. In addition to the photospheric variability, the chromospheric variability was studied using the Balmer emission. The mean Hα profile has a narrow component consistent with rotational broadening and a broad component extending out to 220 km s−1. The variability in Hα suggests that the chromosphere has at least one slingshot prominence 3R* above the surface.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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