WFRF:(Meimon S.)
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- Lacour, S. (author)
The limb-darkened Arcturus : imaging with the IOTA/IONIC interferometer
- Article/chapterEnglish2008
Publisher, publication year, extent ...
- 2008-04-22
- EDP Sciences,2008
- printrdacarrier
Numbers
- LIBRIS-ID:oai:DiVA.org:uu-110047
- https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-110047URI
- https://doi.org/10.1051/0004-6361:200809611DOI
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- Language:English
- Summary in:English
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- SwePubSwePub
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Notes
- Aims. We undertook an H band interferometric examination of Arcturus, a star frequently used as a spatial and spectral calibrator. Methods. Using the IOTA 3 telescope interferometer, we performed spectro-interferometric observations (R approximate to 35) of Arcturus. Atmospheric models and prescriptions were fitted to the data to derive the brightness distribution of the photosphere. Image reconstruction was performed using two software algorithms: WISARD and MIRA. Results. An achromatic power law proved to be a good model of the brightness distribution, with a limb darkening compatible with the one derived from atmospheric model simulations using our mARCS model. A Rosseland diameter of 21.05 +/- 0.21 was derived, corresponding to an effective temperature of T-eff = 4295 +/- 26 K. No companion was detected from the closure phases, with an upper limit on the brightness ratio of 8 x 10(-4) at 1 AU. The dynamic range at such distance from the photosphere was established as 1.5 x 10(-4) (1 sigma rms). An upper limit of 1.7 x 10(-3) was also derived for the level of brightness asymmetries present in the photosphere.
Subject headings and genre
- NATURVETENSKAP Fysik hsv//swe
- NATURAL SCIENCES Physical Sciences hsv//eng
- techniques : interferometric
- stars : fundamental parameters
- infrared : stars
- stars : individual : Arcturus
- Physics
- Fysik
Added entries (persons, corporate bodies, meetings, titles ...)
- Meimon, S. (author)
- Thiebaut, E. (author)
- Perrin, G. (author)
- Verhoelst, T. (author)
- Pedretti, E. (author)
- Schuller, P. A. (author)
- Mugnier, L. (author)
- Monnier, J. (author)
- Berger, J. P. (author)
- Haubois, X. (author)
- Poncelet, A. (author)
- Le Besnerais, G. (author)
- Eriksson, KjellUppsala universitet,Institutionen för astronomi och rymdfysik(Swepub:uu)kjelerik (author)
- Millan-Gabet, R. (author)
- Ragland, S. (author)
- Lacasse, M. (author)
- Traub, W. (author)
- Uppsala universitetInstitutionen för astronomi och rymdfysik (creator_code:org_t)
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- In:Astronomy and Astrophysics: EDP Sciences485:2, s. 561-5700004-63611432-0746
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- Schuller, P. A.
- Mugnier, L.
- Monnier, J.
- Berger, J. P.
- Haubois, X.
- Poncelet, A.
- Le Besnerais, G.
- Eriksson, Kjell
- Millan-Gabet, R.
- Ragland, S.
- Lacasse, M.
- Traub, W.
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