Observations of non‐solar‐type dynamo processes in stars with shallow convective zones
Identifieur interne : 006370 ( Main/Exploration ); précédent : 006369; suivant : 006371Observations of non‐solar‐type dynamo processes in stars with shallow convective zones
Auteurs : S. V. Jeffers [Pays-Bas] ; J. Donati [France] ; E. Alecian [France] ; S. C. Marsden [Australie]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2011-02-21.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
- Active longitudes, Azimuthal, Azimuthal field, Bold line, Cameron, Collier, Collier cameron, Convection, Convection zone, Convective, Convective turnover time, Convective zone, Data sets, Differential rotation, Differential rotation measurements, Differential topology, Donati, Donati collier cameron, Dynamo, Dynamo processes, Eld, Fractional, Fractional spot coverage, Further evidence, High latitudes, Jeffers, Jeffers donati, Light curve, Longitude, Magnetic features, Magnetic fields, Magnetic polarity, Magnetic stars, Maximum entropy, Meridional, Mnras, Monthly notices, November, Other stars, Phase coverage, Rossby, Rossby number, Rotation, Rotation rate, Rotational, Rotational phase, Rotational pole, September, Shallow convective zones, Solar type star, Solid line, Spectral type, Spectral types, Spectropolarimetry, Spot coverage, Ssler, Starspots, Stellar, Stellar activity, Stokes, Strassmeier, Sun, Surface brightness, Surface brightness distribution, Surface brightness images, Telescope bernard lyot, Temporal evolution, Topology, Toroidal.
- Teeft :
- Active longitudes, Azimuthal, Bold line, Cameron, Collier, Collier cameron, Convection, Convection zone, Convective, Convective turnover time, Convective zone, Data sets, Differential rotation, Differential rotation measurements, Donati, Donati collier cameron, Dynamo, Dynamo processes, Eld, Fractional, Fractional spot coverage, Further evidence, High latitudes, Jeffers, Jeffers donati, Light curve, Longitude, Magnetic features, Maximum entropy, Meridional, Mnras, Monthly notices, November, Other stars, Phase coverage, Rossby, Rossby number, Rotation, Rotation rate, Rotational, Rotational phase, Rotational pole, September, Shallow convective zones, Solid line, Spectral type, Spectral types, Spot coverage, Ssler, Starspots, Stellar, Stokes, Strassmeier, Surface brightness distribution, Surface brightness images, Telescope bernard lyot, Temporal evolution, Topology, Toroidal.
Abstract
The magnetic field topology and differential rotation are fundamental signatures of the dynamo processes that generate the magnetic activity observed in the Sun and solar‐type stars. To investigate how these dynamo processes evolve in stars with shallow convective zones, we present high‐resolution spectropolarimetric observations of the young GO dwarf HD 171488 over three epochs. Using the Zeeman–Doppler tomographic imaging technique, we have reconstructed surface brightness images that are dominated by polar and high‐latitude starspots and a magnetic field topology that shows large‐scale radial and azimuthal magnetic field components. Over the time‐span of our observations, we do not observe a reversal of the magnetic field polarity as has been observed in other solar‐type stars with shallow convective zones. The phase coverage of our data was sufficient to determine the differential rotation for two epochs where in conjunction with previous work, we conclude that there is no evidence for the temporal evolution of differential rotation.
Url:
DOI: 10.1111/j.1365-2966.2010.17762.x
Affiliations:
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Le document en format XML
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Alecian</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>Observatoire de Paris, LESIA, 5, place Jules Janssen, F‐92195 Meudon Principal Cedex</wicri:regionArea><placeName><region type="region" nuts="2">Île-de-France</region><settlement type="city">Meudon Principal</settlement></placeName></affiliation></author><author><name sortKey="Marsden, S C" sort="Marsden, S C" uniqKey="Marsden S" first="S. C." last="Marsden">S. C. Marsden</name><affiliation wicri:level="1"><country xml:lang="fr">Australie</country><wicri:regionArea>Anglo Australian Observatory, PO Box 296, Epping, NSW 1710</wicri:regionArea><wicri:noRegion>NSW 1710</wicri:noRegion></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">411</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="1301">1301</biblScope><biblScope unit="page" to="1312">1312</biblScope><biblScope unit="page-count">12</biblScope><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2011-02-21">2011-02-21</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>Active longitudes</term><term>Azimuthal</term><term>Azimuthal field</term><term>Bold line</term><term>Cameron</term><term>Collier</term><term>Collier cameron</term><term>Convection</term><term>Convection zone</term><term>Convective</term><term>Convective turnover time</term><term>Convective zone</term><term>Data sets</term><term>Differential rotation</term><term>Differential rotation measurements</term><term>Differential topology</term><term>Donati</term><term>Donati collier cameron</term><term>Dynamo</term><term>Dynamo processes</term><term>Eld</term><term>Fractional</term><term>Fractional spot coverage</term><term>Further evidence</term><term>High latitudes</term><term>Jeffers</term><term>Jeffers donati</term><term>Light curve</term><term>Longitude</term><term>Magnetic features</term><term>Magnetic fields</term><term>Magnetic polarity</term><term>Magnetic stars</term><term>Maximum entropy</term><term>Meridional</term><term>Mnras</term><term>Monthly notices</term><term>November</term><term>Other stars</term><term>Phase coverage</term><term>Rossby</term><term>Rossby number</term><term>Rotation</term><term>Rotation rate</term><term>Rotational</term><term>Rotational phase</term><term>Rotational pole</term><term>September</term><term>Shallow convective zones</term><term>Solar type star</term><term>Solid line</term><term>Spectral type</term><term>Spectral types</term><term>Spectropolarimetry</term><term>Spot coverage</term><term>Ssler</term><term>Starspots</term><term>Stellar</term><term>Stellar activity</term><term>Stokes</term><term>Strassmeier</term><term>Sun</term><term>Surface brightness</term><term>Surface brightness distribution</term><term>Surface brightness images</term><term>Telescope bernard lyot</term><term>Temporal evolution</term><term>Topology</term><term>Toroidal</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Activité stellaire</term><term>Brillance surface</term><term>Champ azimutal</term><term>Champ magnétique</term><term>Etoile magnétique</term><term>Etoile type solaire</term><term>Polarité magnétique</term><term>Rotation différentielle</term><term>Soleil</term><term>Spectropolarimétrie</term><term>Tache stellaire</term><term>Topologie différentielle</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Active longitudes</term><term>Azimuthal</term><term>Bold line</term><term>Cameron</term><term>Collier</term><term>Collier cameron</term><term>Convection</term><term>Convection zone</term><term>Convective</term><term>Convective turnover time</term><term>Convective zone</term><term>Data sets</term><term>Differential rotation</term><term>Differential rotation measurements</term><term>Donati</term><term>Donati collier cameron</term><term>Dynamo</term><term>Dynamo processes</term><term>Eld</term><term>Fractional</term><term>Fractional spot coverage</term><term>Further evidence</term><term>High latitudes</term><term>Jeffers</term><term>Jeffers donati</term><term>Light curve</term><term>Longitude</term><term>Magnetic features</term><term>Maximum entropy</term><term>Meridional</term><term>Mnras</term><term>Monthly notices</term><term>November</term><term>Other stars</term><term>Phase coverage</term><term>Rossby</term><term>Rossby number</term><term>Rotation</term><term>Rotation rate</term><term>Rotational</term><term>Rotational phase</term><term>Rotational pole</term><term>September</term><term>Shallow convective zones</term><term>Solid line</term><term>Spectral type</term><term>Spectral types</term><term>Spot coverage</term><term>Ssler</term><term>Starspots</term><term>Stellar</term><term>Stokes</term><term>Strassmeier</term><term>Surface brightness distribution</term><term>Surface brightness images</term><term>Telescope bernard lyot</term><term>Temporal evolution</term><term>Topology</term><term>Toroidal</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The magnetic field topology and differential rotation are fundamental signatures of the dynamo processes that generate the magnetic activity observed in the Sun and solar‐type stars. To investigate how these dynamo processes evolve in stars with shallow convective zones, we present high‐resolution spectropolarimetric observations of the young GO dwarf HD 171488 over three epochs. Using the Zeeman–Doppler tomographic imaging technique, we have reconstructed surface brightness images that are dominated by polar and high‐latitude starspots and a magnetic field topology that shows large‐scale radial and azimuthal magnetic field components. Over the time‐span of our observations, we do not observe a reversal of the magnetic field polarity as has been observed in other solar‐type stars with shallow convective zones. The phase coverage of our data was sufficient to determine the differential rotation for two epochs where in conjunction with previous work, we conclude that there is no evidence for the temporal evolution of differential rotation.</div></front></TEI><affiliations><list><country><li>Australie</li><li>France</li><li>Pays-Bas</li></country><region><li>Île-de-France</li></region><settlement><li>Meudon Principal</li></settlement></list><tree><country name="Pays-Bas"><noRegion><name sortKey="Jeffers, S V" sort="Jeffers, S V" uniqKey="Jeffers S" first="S. V." last="Jeffers">S. V. Jeffers</name></noRegion><name sortKey="Jeffers, S V" sort="Jeffers, S V" uniqKey="Jeffers S" first="S. V." last="Jeffers">S. V. Jeffers</name></country><country name="France"><noRegion><name sortKey="Donati, J" sort="Donati, J" uniqKey="Donati J" first="J." last="Donati">J. Donati</name></noRegion><name sortKey="Alecian, E" sort="Alecian, E" uniqKey="Alecian E" first="E." last="Alecian">E. Alecian</name></country><country name="Australie"><noRegion><name sortKey="Marsden, S C" sort="Marsden, S C" uniqKey="Marsden S" first="S. C." last="Marsden">S. C. Marsden</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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