Doppler images and chromospheric variability of TWA 6
Identifieur interne : 001F67 ( Istex/Curation ); précédent : 001F66; suivant : 001F68Doppler images and chromospheric variability of TWA 6
Auteurs : M. B. Skelly [Royaume-Uni] ; Y. C. Unruh ; A. Collier Cameron ; J. R. Barnes ; J. Donati [France] ; W. A. Lawson [Australie] ; B. D. Carter [Australie]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2008-04-01.
English descriptors
- KwdEn :
- Absorption feature, Absorption spectrum, Active regions, Angular velocity, Arcsec, Bright regions, Broad component, Cambridge univ, Cameron, Central images, Circumstellar discs, Cohen kuhi, Collier, Collier cameron, Complete spot, Convective stars, Cool stars, Coriolis forces, Corotation radius, Crause, Data sets, Deep convection zones, Differential rotation, Donati, Donati collier cameron, Doppler, Doppler image, Doppler images, Doppler imaging, Effective temperature, Equivalent width, Exposure time, February, February image, High latitudes, Higher latitudes, Hydrae association, Imaging, Inclination angle, Journal compilation, Latitude, Latitude band, Latitude range, Lawson, Lawson crause, Light curves, Line list, Lling, Lling factor, Lower latitudes, Maximum correlation, Maximum velocity, Meridional circulation, Mnras, Nancial support, Narrow component, Other parameters, Other stars, Phase coverage, Phase range, Photometry, Photospheric spots, Polar spot, Prominence, Radiative core, Rotation, Rotational, Rotational periods, Rotational velocity, Same phases, Schuessler solanki, Second data, Similar phases, Slingshot, Slingshot prominence, Slingshot prominences, Solid line, Spectral standards, Spectral type, Spot coverage, Spot distribution, Stellar, Stellar disc, Stellar photospheres, Tauri, Tauri phase, Tauri star, Tauri stars, Telluric, Telluric lines, Telluric target, Tube emergence, Upper limit, Velocity range, Webb, Zuckerman song.
- Teeft :
- Absorption feature, Absorption spectrum, Active regions, Angular velocity, Arcsec, Bright regions, Broad component, Cambridge univ, Cameron, Central images, Circumstellar discs, Cohen kuhi, Collier, Collier cameron, Complete spot, Convective stars, Cool stars, Coriolis forces, Corotation radius, Crause, Data sets, Deep convection zones, Differential rotation, Donati, Donati collier cameron, Doppler, Doppler image, Doppler images, Doppler imaging, Effective temperature, Equivalent width, Exposure time, February, February image, High latitudes, Higher latitudes, Hydrae association, Imaging, Inclination angle, Journal compilation, Latitude, Latitude band, Latitude range, Lawson, Lawson crause, Light curves, Line list, Lling, Lling factor, Lower latitudes, Maximum correlation, Maximum velocity, Meridional circulation, Mnras, Nancial support, Narrow component, Other parameters, Other stars, Phase coverage, Phase range, Photometry, Photospheric spots, Polar spot, Prominence, Radiative core, Rotation, Rotational, Rotational periods, Rotational velocity, Same phases, Schuessler solanki, Second data, Similar phases, Slingshot, Slingshot prominence, Slingshot prominences, Solid line, Spectral standards, Spectral type, Spot coverage, Spot distribution, Stellar, Stellar disc, Stellar photospheres, Tauri, Tauri phase, Tauri star, Tauri stars, Telluric, Telluric lines, Telluric target, Tube emergence, Upper limit, Velocity range, Webb, Zuckerman song.
Abstract
We present Doppler imaging and Balmer line analysis of the weak‐line T Tauri star TWA 6. Using these data we have made one of the first attempts to measure differential rotation in a T Tauri star, and the first detection of a slingshot prominence in such a star. We also show the most direct evidence to date of the existence of solar‐type plages in a star other than the Sun. Observations were made over six nights: 2006 February 11–13 and 2006 February 18–20, when spectra were taken with the UCL Echelle Spectrograph on the 3.9‐m Anglo‐Australian Telescope. Using least‐squares deconvolution to improve the effective signal‐to‐noise ratio we produced two Doppler maps. These show 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 equator. Comparison of the two maps was carried out to measure the differential rotation. Cross‐correlation and parameter fitting indicates that TWA 6 does not have detectable differential rotation. The Balmer emission of the star was studied. The mean Hα profile has a narrow component consistent with rotational broadening and a broad component extending out to ±250 km s−1. The variability in Hα suggests that the chromosphere has active regions that are cospatial with the spots in the photosphere, similar to the ‘plages’ observed on the Sun. In addition the star has at least one slingshot prominence 3R* above the surface – the first such detection in a T Tauri star.
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DOI: 10.1111/j.1365-2966.2008.12917.x
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Y. C. Unruh<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>School of Physics and Astronomy, University of St Andrews, Fife KY16 9SS</mods:affiliation><wicri:noCountry code="subField">9SS</wicri:noCountry></affiliation><affiliation><mods:affiliation>Centre for Astrophysics Research, University of Hertfordshire, College Lane, Hatfield, Hertfordshire AL10 9AB</mods:affiliation><wicri:noCountry code="subField">9AB</wicri:noCountry></affiliation>Le document en format XML
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B." last="Skelly">M. B. Skelly</name><affiliation><mods:affiliation>Astrophysics Group, Imperial College of Science, Technology and Medicine, London SW7 2AZ</mods:affiliation></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: mairead.skelly@imperial.ac.uk</mods:affiliation><country wicri:rule="url">Royaume-Uni</country></affiliation></author><author><name sortKey="Unruh, Y C" sort="Unruh, Y C" uniqKey="Unruh Y" first="Y. 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="Cameron, A Collier" sort="Cameron, A Collier" uniqKey="Cameron A" first="A. Collier" last="Cameron">A. 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><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, Hertfordshire AL10 9AB</mods:affiliation><wicri:noCountry code="subField">9AB</wicri:noCountry></affiliation></author><author><name sortKey="Donati, J" sort="Donati, J" uniqKey="Donati J" first="J." last="Donati">J. 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Lawson</name><affiliation wicri:level="1"><mods:affiliation>School of Physical, Environmental and Mathematical Sciences, University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>School of Physical, Environmental and Mathematical Sciences, University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600</wicri:regionArea></affiliation></author><author><name sortKey="Carter, B D" sort="Carter, B D" uniqKey="Carter B" first="B. D." last="Carter">B. D. Carter</name><affiliation wicri:level="1"><mods:affiliation>Faculty of Sciences, University of Southern Queensland, Toowoomba 4350, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Faculty of Sciences, University of Southern Queensland, Toowoomba 4350</wicri:regionArea></affiliation></author></analytic><monogr></monogr><series><title level="j" type="main">Monthly Notices of the Royal Astronomical Society</title><title level="j" type="alt">MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY</title><idno type="ISSN">0035-8711</idno><idno type="eISSN">1365-2966</idno><imprint><biblScope unit="vol">385</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="708">708</biblScope><biblScope unit="page" to="718">718</biblScope><biblScope unit="page-count">11</biblScope><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2008-04-01">2008-04-01</date></imprint><idno type="ISSN">0035-8711</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0035-8711</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Absorption feature</term><term>Absorption spectrum</term><term>Active regions</term><term>Angular velocity</term><term>Arcsec</term><term>Bright regions</term><term>Broad component</term><term>Cambridge univ</term><term>Cameron</term><term>Central images</term><term>Circumstellar discs</term><term>Cohen kuhi</term><term>Collier</term><term>Collier cameron</term><term>Complete spot</term><term>Convective stars</term><term>Cool stars</term><term>Coriolis forces</term><term>Corotation radius</term><term>Crause</term><term>Data sets</term><term>Deep convection zones</term><term>Differential rotation</term><term>Donati</term><term>Donati collier cameron</term><term>Doppler</term><term>Doppler image</term><term>Doppler images</term><term>Doppler imaging</term><term>Effective temperature</term><term>Equivalent width</term><term>Exposure time</term><term>February</term><term>February image</term><term>High latitudes</term><term>Higher latitudes</term><term>Hydrae association</term><term>Imaging</term><term>Inclination angle</term><term>Journal compilation</term><term>Latitude</term><term>Latitude band</term><term>Latitude range</term><term>Lawson</term><term>Lawson crause</term><term>Light curves</term><term>Line list</term><term>Lling</term><term>Lling factor</term><term>Lower latitudes</term><term>Maximum correlation</term><term>Maximum velocity</term><term>Meridional circulation</term><term>Mnras</term><term>Nancial support</term><term>Narrow component</term><term>Other parameters</term><term>Other stars</term><term>Phase coverage</term><term>Phase range</term><term>Photometry</term><term>Photospheric spots</term><term>Polar spot</term><term>Prominence</term><term>Radiative core</term><term>Rotation</term><term>Rotational</term><term>Rotational periods</term><term>Rotational velocity</term><term>Same phases</term><term>Schuessler solanki</term><term>Second data</term><term>Similar phases</term><term>Slingshot</term><term>Slingshot prominence</term><term>Slingshot prominences</term><term>Solid line</term><term>Spectral standards</term><term>Spectral type</term><term>Spot coverage</term><term>Spot distribution</term><term>Stellar</term><term>Stellar disc</term><term>Stellar photospheres</term><term>Tauri</term><term>Tauri phase</term><term>Tauri star</term><term>Tauri stars</term><term>Telluric</term><term>Telluric lines</term><term>Telluric target</term><term>Tube emergence</term><term>Upper limit</term><term>Velocity range</term><term>Webb</term><term>Zuckerman song</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Absorption feature</term><term>Absorption spectrum</term><term>Active regions</term><term>Angular velocity</term><term>Arcsec</term><term>Bright regions</term><term>Broad component</term><term>Cambridge univ</term><term>Cameron</term><term>Central images</term><term>Circumstellar discs</term><term>Cohen kuhi</term><term>Collier</term><term>Collier cameron</term><term>Complete spot</term><term>Convective stars</term><term>Cool stars</term><term>Coriolis forces</term><term>Corotation radius</term><term>Crause</term><term>Data sets</term><term>Deep convection zones</term><term>Differential rotation</term><term>Donati</term><term>Donati collier cameron</term><term>Doppler</term><term>Doppler image</term><term>Doppler images</term><term>Doppler imaging</term><term>Effective temperature</term><term>Equivalent width</term><term>Exposure time</term><term>February</term><term>February image</term><term>High latitudes</term><term>Higher latitudes</term><term>Hydrae association</term><term>Imaging</term><term>Inclination angle</term><term>Journal compilation</term><term>Latitude</term><term>Latitude band</term><term>Latitude range</term><term>Lawson</term><term>Lawson crause</term><term>Light curves</term><term>Line list</term><term>Lling</term><term>Lling factor</term><term>Lower latitudes</term><term>Maximum correlation</term><term>Maximum velocity</term><term>Meridional circulation</term><term>Mnras</term><term>Nancial support</term><term>Narrow component</term><term>Other parameters</term><term>Other stars</term><term>Phase coverage</term><term>Phase range</term><term>Photometry</term><term>Photospheric spots</term><term>Polar spot</term><term>Prominence</term><term>Radiative core</term><term>Rotation</term><term>Rotational</term><term>Rotational periods</term><term>Rotational velocity</term><term>Same phases</term><term>Schuessler solanki</term><term>Second data</term><term>Similar phases</term><term>Slingshot</term><term>Slingshot prominence</term><term>Slingshot prominences</term><term>Solid line</term><term>Spectral standards</term><term>Spectral type</term><term>Spot coverage</term><term>Spot distribution</term><term>Stellar</term><term>Stellar disc</term><term>Stellar photospheres</term><term>Tauri</term><term>Tauri phase</term><term>Tauri star</term><term>Tauri stars</term><term>Telluric</term><term>Telluric lines</term><term>Telluric target</term><term>Tube emergence</term><term>Upper limit</term><term>Velocity range</term><term>Webb</term><term>Zuckerman song</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">We present Doppler imaging and Balmer line analysis of the weak‐line T Tauri star TWA 6. Using these data we have made one of the first attempts to measure differential rotation in a T Tauri star, and the first detection of a slingshot prominence in such a star. We also show the most direct evidence to date of the existence of solar‐type plages in a star other than the Sun. Observations were made over six nights: 2006 February 11–13 and 2006 February 18–20, when spectra were taken with the UCL Echelle Spectrograph on the 3.9‐m Anglo‐Australian Telescope. Using least‐squares deconvolution to improve the effective signal‐to‐noise ratio we produced two Doppler maps. These show 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 equator. Comparison of the two maps was carried out to measure the differential rotation. Cross‐correlation and parameter fitting indicates that TWA 6 does not have detectable differential rotation. The Balmer emission of the star was studied. The mean Hα profile has a narrow component consistent with rotational broadening and a broad component extending out to ±250 km s−1. The variability in Hα suggests that the chromosphere has active regions that are cospatial with the spots in the photosphere, similar to the ‘plages’ observed on the Sun. In addition the star has at least one slingshot prominence 3R* above the surface – the first such detection in a T Tauri star.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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