Solar-like oscillations in the G8V star r Ceti
Identifieur interne : 008087 ( Main/Exploration ); précédent : 008086; suivant : 008088Solar-like oscillations in the G8V star r Ceti
Auteurs : T. C. Teixeira [Portugal, Danemark] ; H. Kjeldsen [Danemark] ; T. R. Bedding [Australie] ; F. Bouchy [France] ; J. Christensen-Dalsgaard [Danemark] ; M. S. Cunha [Portugal] ; T. Dall [États-Unis] ; S. Frandsen [Danemark] ; C. Karoff [Danemark] ; M. J. P. F. G. Monteiro [Portugal] ; F. P. Pijpers [Danemark, Royaume-Uni]Source :
- Astronomy and astrophysics : (Berlin. Print) [ 0004-6361 ] ; 2009.
Descripteurs français
- Pascal (Inist)
English descriptors
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Abstract
We used HARPS to measure oscillations in the low-mass star T Cet. Although the data were compromised by instrumental noise, we have been able to extract the main features of the oscillations. We found T Cet to oscillate with an amplitude that is about half that of the Sun, and with a mode lifetime that is slightly shorter than solar. The large frequency separation is 169 μHz, and we have identified modes with degrees 0, 1, 2, and 3. We used the frequencies to estimate the mean density of the star to an accuracy of 0.45% which, combined with the interferometric radius, gives a mass of 0.783 ± 0,012 M◦. (1.6%).
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C." last="Teixeira">T. C. Teixeira</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Centro de Astrofisica da Universidade do Porto, Rua das Estrelas</s1><s2>4150-762 Porto</s2><s3>PRT</s3><sZ>1 aut.</sZ><sZ>6 aut.</sZ><sZ>10 aut.</sZ></inist:fA14><country>Portugal</country><wicri:noRegion>4150-762 Porto</wicri:noRegion></affiliation><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Department of Physics and Astronomy, Aarhus University</s1><s2>8000 Aarhus</s2><s3>DNK</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>5 aut.</sZ><sZ>8 aut.</sZ><sZ>9 aut.</sZ><sZ>11 aut.</sZ></inist:fA14><country>Danemark</country><wicri:noRegion>8000 Aarhus</wicri:noRegion></affiliation></author><author><name sortKey="Kjeldsen, H" sort="Kjeldsen, H" uniqKey="Kjeldsen H" first="H." last="Kjeldsen">H. Kjeldsen</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Department of Physics and Astronomy, Aarhus University</s1><s2>8000 Aarhus</s2><s3>DNK</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>5 aut.</sZ><sZ>8 aut.</sZ><sZ>9 aut.</sZ><sZ>11 aut.</sZ></inist:fA14><country>Danemark</country><wicri:noRegion>8000 Aarhus</wicri:noRegion></affiliation></author><author><name sortKey="Bedding, T R" sort="Bedding, T R" uniqKey="Bedding T" first="T. R." last="Bedding">T. R. Bedding</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney 2006</s1><s3>AUS</s3><sZ>3 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney 2006</wicri:noRegion></affiliation></author><author><name sortKey="Bouchy, F" sort="Bouchy, F" uniqKey="Bouchy F" first="F." last="Bouchy">F. Bouchy</name><affiliation wicri:level="1"><inist:fA14 i1="04"><s1>Laboratoire d'Astrophysique de Marseille, Traverse du Siphon, BP 8</s1><s2>13376 Marseille</s2><s3>FRA</s3><sZ>4 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>13376 Marseille</wicri:noRegion><placeName><settlement type="city">Marseille</settlement><region type="région" nuts="2">Provence-Alpes-Côte d'Azur</region></placeName></affiliation></author><author><name sortKey="Christensen Dalsgaard, J" sort="Christensen Dalsgaard, J" uniqKey="Christensen Dalsgaard J" first="J." last="Christensen-Dalsgaard">J. Christensen-Dalsgaard</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Department of Physics and Astronomy, Aarhus University</s1><s2>8000 Aarhus</s2><s3>DNK</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>5 aut.</sZ><sZ>8 aut.</sZ><sZ>9 aut.</sZ><sZ>11 aut.</sZ></inist:fA14><country>Danemark</country><wicri:noRegion>8000 Aarhus</wicri:noRegion></affiliation></author><author><name sortKey="Cunha, M S" sort="Cunha, M S" uniqKey="Cunha M" first="M. S." last="Cunha">M. S. Cunha</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Centro de Astrofisica da Universidade do Porto, Rua das Estrelas</s1><s2>4150-762 Porto</s2><s3>PRT</s3><sZ>1 aut.</sZ><sZ>6 aut.</sZ><sZ>10 aut.</sZ></inist:fA14><country>Portugal</country><wicri:noRegion>4150-762 Porto</wicri:noRegion></affiliation></author><author><name sortKey="Dall, T" sort="Dall, T" uniqKey="Dall T" first="T." last="Dall">T. Dall</name><affiliation wicri:level="1"><inist:fA14 i1="05"><s1>Gemini Observatory, 670 N. A'ohoku PI</s1><s2>Hilo, HI 96720</s2><s3>USA</s3><sZ>7 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Hilo, HI 96720</wicri:noRegion></affiliation></author><author><name sortKey="Frandsen, S" sort="Frandsen, S" uniqKey="Frandsen S" first="S." last="Frandsen">S. Frandsen</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Department of Physics and Astronomy, Aarhus University</s1><s2>8000 Aarhus</s2><s3>DNK</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>5 aut.</sZ><sZ>8 aut.</sZ><sZ>9 aut.</sZ><sZ>11 aut.</sZ></inist:fA14><country>Danemark</country><wicri:noRegion>8000 Aarhus</wicri:noRegion></affiliation></author><author><name sortKey="Karoff, C" sort="Karoff, C" uniqKey="Karoff C" first="C." last="Karoff">C. Karoff</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Department of Physics and Astronomy, Aarhus University</s1><s2>8000 Aarhus</s2><s3>DNK</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>5 aut.</sZ><sZ>8 aut.</sZ><sZ>9 aut.</sZ><sZ>11 aut.</sZ></inist:fA14><country>Danemark</country><wicri:noRegion>8000 Aarhus</wicri:noRegion></affiliation></author><author><name sortKey="Monteiro, M J P F G" sort="Monteiro, M J P F G" uniqKey="Monteiro M" first="M. J. P. F. G." last="Monteiro">M. J. P. F. G. Monteiro</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Centro de Astrofisica da Universidade do Porto, Rua das Estrelas</s1><s2>4150-762 Porto</s2><s3>PRT</s3><sZ>1 aut.</sZ><sZ>6 aut.</sZ><sZ>10 aut.</sZ></inist:fA14><country>Portugal</country><wicri:noRegion>4150-762 Porto</wicri:noRegion></affiliation><affiliation wicri:level="1"><inist:fA14 i1="06"><s1>Departamento de Matematica Aplicada da Faculdade de Ciencias da Universidade do Porto</s1><s3>PRT</s3><sZ>10 aut.</sZ></inist:fA14><country>Portugal</country><wicri:noRegion>Departamento de Matematica Aplicada da Faculdade de Ciencias da Universidade do Porto</wicri:noRegion></affiliation></author><author><name sortKey="Pijpers, F P" sort="Pijpers, F P" uniqKey="Pijpers F" first="F. P." last="Pijpers">F. P. Pijpers</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Department of Physics and Astronomy, Aarhus University</s1><s2>8000 Aarhus</s2><s3>DNK</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>5 aut.</sZ><sZ>8 aut.</sZ><sZ>9 aut.</sZ><sZ>11 aut.</sZ></inist:fA14><country>Danemark</country><wicri:noRegion>8000 Aarhus</wicri:noRegion></affiliation><affiliation wicri:level="1"><inist:fA14 i1="07"><s1>Blackett Laboratory, Impérial College London</s1><s2>South Kensington, London SW7 2BW</s2><s3>GBR</s3><sZ>11 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>South Kensington, London SW7 2BW</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Astronomy and astrophysics : (Berlin. Print)</title><title level="j" type="abbreviated">Astron. astrophys. : (Berl., Print)</title><idno type="ISSN">0004-6361</idno><imprint><date when="2009">2009</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Astronomy and astrophysics : (Berlin. Print)</title><title level="j" type="abbreviated">Astron. astrophys. : (Berl., Print)</title><idno type="ISSN">0004-6361</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Lifetime</term><term>Low-mass stars</term><term>Sun</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Etoile faible masse</term><term>Soleil</term><term>Durée vie</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">We used HARPS to measure oscillations in the low-mass star T Cet. Although the data were compromised by instrumental noise, we have been able to extract the main features of the oscillations. We found T Cet to oscillate with an amplitude that is about half that of the Sun, and with a mode lifetime that is slightly shorter than solar. The large frequency separation is 169 μHz, and we have identified modes with degrees 0, 1, 2, and 3. We used the frequencies to estimate the mean density of the star to an accuracy of 0.45% which, combined with the interferometric radius, gives a mass of 0.783 ± 0,012 M<sub>◦.</sub> (1.6%).</div></front></TEI><affiliations><list><country><li>Australie</li><li>Danemark</li><li>France</li><li>Portugal</li><li>Royaume-Uni</li><li>États-Unis</li></country><region><li>Provence-Alpes-Côte d'Azur</li></region><settlement><li>Marseille</li></settlement></list><tree><country name="Portugal"><noRegion><name sortKey="Teixeira, T C" sort="Teixeira, T C" uniqKey="Teixeira T" first="T. C." last="Teixeira">T. C. Teixeira</name></noRegion><name sortKey="Cunha, M S" sort="Cunha, M S" uniqKey="Cunha M" first="M. S." last="Cunha">M. S. Cunha</name><name sortKey="Monteiro, M J P F G" sort="Monteiro, M J P F G" uniqKey="Monteiro M" first="M. J. P. F. G." last="Monteiro">M. J. P. F. G. Monteiro</name><name sortKey="Monteiro, M J P F G" sort="Monteiro, M J P F G" uniqKey="Monteiro M" first="M. J. P. F. G." last="Monteiro">M. J. P. F. G. Monteiro</name></country><country name="Danemark"><noRegion><name sortKey="Teixeira, T C" sort="Teixeira, T C" uniqKey="Teixeira T" first="T. C." last="Teixeira">T. C. Teixeira</name></noRegion><name sortKey="Christensen Dalsgaard, J" sort="Christensen Dalsgaard, J" uniqKey="Christensen Dalsgaard J" first="J." last="Christensen-Dalsgaard">J. Christensen-Dalsgaard</name><name sortKey="Frandsen, S" sort="Frandsen, S" uniqKey="Frandsen S" first="S." last="Frandsen">S. Frandsen</name><name sortKey="Karoff, C" sort="Karoff, C" uniqKey="Karoff C" first="C." last="Karoff">C. Karoff</name><name sortKey="Kjeldsen, H" sort="Kjeldsen, H" uniqKey="Kjeldsen H" first="H." last="Kjeldsen">H. Kjeldsen</name><name sortKey="Pijpers, F P" sort="Pijpers, F P" uniqKey="Pijpers F" first="F. P." last="Pijpers">F. P. Pijpers</name></country><country name="Australie"><noRegion><name sortKey="Bedding, T R" sort="Bedding, T R" uniqKey="Bedding T" first="T. R." last="Bedding">T. R. Bedding</name></noRegion></country><country name="France"><region name="Provence-Alpes-Côte d'Azur"><name sortKey="Bouchy, F" sort="Bouchy, F" uniqKey="Bouchy F" first="F." last="Bouchy">F. Bouchy</name></region></country><country name="États-Unis"><noRegion><name sortKey="Dall, T" sort="Dall, T" uniqKey="Dall T" first="T." last="Dall">T. Dall</name></noRegion></country><country name="Royaume-Uni"><noRegion><name sortKey="Pijpers, F P" sort="Pijpers, F P" uniqKey="Pijpers F" first="F. P." last="Pijpers">F. P. Pijpers</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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