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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Limb-darkening measurements for a cool red giant in microlensing event OGLE 2004-BLG-482
Astronomy and Astrophysics, Volume 525, No. 17, Article A15, Year 2011
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Description
Aims. We present a detailed analysis of OGLE 2004-BLG-482, a relatively high-magnification single-lens microlensing event that exhibits clear extended-source effects. These events are relatively rare, but they potentially contain unique information on the stellar atmosphere properties of their source star, as shown in this study. Methods. Our dense photometric coverage of the overall light curve and a proper microlensing modelling allow us to derive measurements of the OGLE 2004-BLG-482source star's linear limb-darkening coefficients in three bands, including standard Johnson-Cousins I and R, as well as in a broad clear filter. In particular, we discuss in detail the problems of multi-band and multi-site modelling on the expected precision of our results. We also obtained high-resolution UVES spectra as part of a ToO programme at ESO VLT, from which we derive the source star's precise fundamental parameters. Results. From the high-resolution UVES spectra, we find that OGLE 2004-BLG-482's source star is a red giant of MK type a bit later than M3, with Teff = 3667 ± 150 K, log g = 2.1 ± 1.0 and an assumed solar metallicity. This is confirmed by an OGLE calibrated colour - magnitude diagram. We then obtain from a detailed microlensing modelling of the light curve linear limb-darkening coefficients that we compare to model-atmosphere predictions available in the literature, and find a very good agreement for the I and R bands. In addition, we perform a similar analysis using an alternative description of limb darkening based on a principal component analysis of ATLAS limb-darkening profiles, and also find a very good agreement between measurements and model predictions. © 2010 ESO.
Authors & Co-Authors
Zub, Marta
Germany, Heidelberg
Astronomisches Rechen-institut
Germany, Heidelberg
Universität Heidelberg
Poland, Zielona Gora
Uniwersytet Zielonogórski
Cassan, Arnaud
Germany, Heidelberg
Astronomisches Rechen-institut
France, Paris
Institut D’astrophysique de Paris
Heyrovský, D.
Czech Republic, Prague
Charles University
Fouqué, Pascal
France, Toulouse
Université Fédérale Toulouse Midi-pyrénées
Stempels, H. C.
Unknown Affiliation
Albrow, Michael D.
New Zealand, Christchurch
University of Canterbury
Beaulieu, Jean Philippe H.
France, Paris
Institut D’astrophysique de Paris
Brillant, Stéphanie
Chile, Santiago
European Southern Observatory Santiago
Christie, Grant W.
New Zealand, Auckland
Stardome Observatory, Auckland
Kains, Noé
United Kingdom, St Andrews
University of st Andrews
Kozłowski, Szymon Z.
United States, Columbus
The Ohio State University
Kubas, Daniel
France, Paris
Institut D’astrophysique de Paris
Chile, Santiago
European Southern Observatory Santiago
Wambsganss, Joachim
Germany, Heidelberg
Astronomisches Rechen-institut
Batista, Virginie
France, Paris
Institut D’astrophysique de Paris
Bennett, David P.
United States, Notre Dame
University of Notre Dame
Cook, Kem H.
United States, Livermore
Lawrence Livermore National Laboratory
Coutures, Christian
France, Paris
Institut D’astrophysique de Paris
Dieters, Stefan W.B.
France, Paris
Institut D’astrophysique de Paris
Dominik, Martin
United Kingdom, St Andrews
University of st Andrews
Dominis-Prester, Dijana
Croatia, Rijeka
Faculty of Physics, University of Rijeka
Donatowicz, J.
Austria, Vienna
Technische Universität Wien
Greenhill, John G.
Australia, Hobart
University of Tasmania
Hörne, Keith D.
United Kingdom, St Andrews
University of st Andrews
Jörgensen, Uffe Gråe
Denmark, Copenhagen
Niels Bohr Institutet
Kane, Stephen R.
United States, Pasadena
California Institute of Technology
Marquette, Jean Baptiste
France, Paris
Institut D’astrophysique de Paris
Martin, Ralph
Australia, Bickley
Perth Observatory
Menzies, John W.
South Africa, Cape Town
South African Astronomical Observatory
Pollard, Karen R.
New Zealand, Christchurch
University of Canterbury
Sahu, Kailash C.
United States, Baltimore
Space Telescope Science Institute
Vinter, C.
Denmark, Copenhagen
Niels Bohr Institutet
Williams, Andrew J.
Australia, Bickley
Perth Observatory
Gould, Andrew P.
United States, Columbus
The Ohio State University
DePoy, Darren L.
United States, Columbus
The Ohio State University
Gal-Yam, Avishay
Israel, Rehovot
Weizmann Institute of Science Israel
Gaudi, B. Scott
United States, Columbus
The Ohio State University
Han, Cheongho
South Korea, Cheongju
Chungbuk National University
Lipkin, Yiftah M.
Israel, Tel Aviv-yafo
Tel Aviv University
Maoz, Dan
Israel, Tel Aviv-yafo
Tel Aviv University
Ofek, Eran O.
United States, Pasadena
California Institute of Technology
Park, Byeong-gon
South Korea, Daejeon
Korea Astronomy and Space Science Institute
Pogge, Richard W.
United States, Columbus
The Ohio State University
McCormick, Jennie M.
New Zealand, Auckland
Centre for Backyard Astrophysics
Udalski, Andrzej
Poland, Warsaw
University of Warsaw
Szymánski, Michał K.
Poland, Warsaw
University of Warsaw
Kubiak, Marcin
Poland, Warsaw
University of Warsaw
Pietrzýnski, Grzegorz
Poland, Warsaw
University of Warsaw
Chile, Biobio
Universidad de Concepcion
Soszyński, Igor
Poland, Warsaw
University of Warsaw
Szewczyk, Olaf
Poland, Warsaw
University of Warsaw
Wyrzykowski, Łukasz
Poland, Warsaw
University of Warsaw
United Kingdom, Cambridge
Institute of Astronomy
Statistics
Citations: 50
Authors: 50
Affiliations: 29
Identifiers
ISSN:
00046361
e-ISSN:
14320746
Research Areas
Health System And Policy