Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011a%26a...526l...4b&link_type=abstract
Astronomy and Astrophysics, Volume 526, id.L4
Astronomy and Astrophysics
Astrophysics
8
Stars: Individual: 18 Sco, Stars: Oscillations, Techniques:, Radial Velocities, Techniques:, Interferometric, Methods: Data Analysis
Scientific paper
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&sun; were estimated. We used these values to derive the mass of the star, 1.02 ± 0.03 M&sun;.
Based on observations collected at the European Southern Observatory (ID 183.D-0729(A)) and at the CHARA Array, operated by Georgia State University.
Arentoft Torben
Asplund Martin
Bazot Michael
Bedding Tim R.
Broomhall Anne-Marie
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