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

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 R⊙ were estimated. We used these values to derive the mass of the star, 1.02 ± 0.03 Me.

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An edited version of this paper was published by EDP Sciences. Copyright 2011 European Southern Observatory.
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Author Bazot, M.
Ireland, M.
Huber, D.
Bedding, T.
Broomhall, A.-M.
Campante, T.
Carfantan, H.
Chaplin, W.
Elsworth, Y.
Meléndez, J.
Petit, P.
Théado, S.
Van Grootel, V.
Arentoft, T.
Asplund, M.
Castro, M.
Christensen-Dalsgaard, J.
do Nascimento, J.
Dintrans, B.
Dumusque, X.
Kjeldsen, H.
McAlister, H.
Metcalfe, Travis
Monteiro, M.
Santos, N.
Sousa, S.
Sturmann, J.
Sturmann, L.
ten Brummelaar, T.
Turner, N.
Vauclair, S.
Publisher UCAR/NCAR - Library
Publication Date 2011-02-01T00:00:00
Digital Object Identifier (DOI) Not Assigned
Alternate Identifier N/A
Resource Version N/A
Topic Category geoscientificInformation
Progress N/A
Metadata Date 2023-08-18T18:49:01.072831
Metadata Record Identifier edu.ucar.opensky::articles:10633
Metadata Language eng; USA
Suggested Citation Bazot, M., Ireland, M., Huber, D., Bedding, T., Broomhall, A.-M., Campante, T., Carfantan, H., Chaplin, W., Elsworth, Y., Meléndez, J., Petit, P., Théado, S., Van Grootel, V., Arentoft, T., Asplund, M., Castro, M., Christensen-Dalsgaard, J., do Nascimento, J., Dintrans, B., Dumusque, X., Kjeldsen, H., McAlister, H., Metcalfe, Travis, Monteiro, M., Santos, N., Sousa, S., Sturmann, J., Sturmann, L., ten Brummelaar, T., Turner, N., Vauclair, S.. (2011). The radius and mass of the close solar twin 18 Scorpii derived from asteroseismology and interferometry. UCAR/NCAR - Library. http://n2t.net/ark:/85065/d7nc61rc. Accessed 22 June 2025.

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