The radius and mass of the close solar twin 18 Scorpii derived from asteroseismology and interferometry

Bazot, Michaël; Ireland, M. J.; Huber, D.; Bedding, T. R.; Broomhall, A.-M.; Campante, A.-M.; Carfantan, H.; Chaplin, W. J.; Elsworth, Y.; Melendez, J.; Petit, Pascal; Théado, Sylvie; Van Grootel, Valérie; Arentoft, T.; Asplund, M.; Castro, M.; Christensen-Dalsgaard, J.; Do Nascimento, J. D.; Dintrans, B.; Dumusque, X.; Kjeldsen, H.; McAlister, H. A.; Metcalfe, T. S.; Monteiro, M.J.P.F.G.; Santos, N. C.; Sousa, S.; Sturmann, J.; Sturmann, L.; Ten Brummelaar, T. N.; Turner, N.; Vauclair, S.

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The radius and mass of the close solar twin 18 Scorpii derived from asteroseismology and interferometry

Bazot, Michaël; Ireland, M. J.; Huber, D. et al.

2011 • In Astronomy and Astrophysics, 526, p. 4

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Keywords :

stars: individual: 18 Sco; stars: oscillations; techniques: radial velocities; techniques: interferometric; methods: data analysis

Abstract :

[en] The growing interest in solar twins is motivated by the possibility of comparing them directly to the Sun. To carry on this kind of analysis, we need to know their physical characteristics with precision. Our first objective is to use asteroseismology and interferometry on the brightest of them: 18 Sco. We observed the star during 12 nights with HARPS for seismology and used the PAVO beam-combiner at CHARA for interferometry. An average large frequency separation 134.4 ± 0.3 μHz and angular and linear radiuses of 0.6759 ± 0.0062 mas and 1.010 ± 0.009 Rsun were estimated. We used these values to derive the mass of the star, 1.02 ± 0.03 Msun.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Bazot, Michaël; Centro de Astrofísica da Universidade do Porto

Ireland, M. J.; University of Sydney > School of Physics > Sydney Institute for Astronomy (SIfA)

Huber, D.; University of Sydney > School of Physics > Sydney Institute for Astronomy (SIfA)

Bedding, T. R.; University of Sydney > School of Physics > Sydney Institute for Astronomy (SIfA)

Broomhall, A.-M.; University of Birmingham > School of Physics and Astronomy

Campante, A.-M.; Centro de Astrofísica da Universidade do Porto

Carfantan, H.; Université de Toulouse > Laboratoire Astrophysique de Toulouse - Tarbes

Chaplin, W. J.; University of Birmingham > School of Physics and Astronomy

Elsworth, Y.; University of Birmingham > School of Physics and Astronomy

Melendez, J.; Centro de Astrofísica da Universidade do Porto

More authors (21 more)

Language :

English

Title :

The radius and mass of the close solar twin 18 Scorpii derived from asteroseismology and interferometry

Publication date :

February 2011

Journal title :

Astronomy and Astrophysics

ISSN :

0004-6361

eISSN :

1432-0746

Publisher :

EDP Sciences, Les Ulis, France

Volume :

526

Pages :

Peer reviewed :

Peer Reviewed verified by ORBi

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