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26 April 2024

» arxiv » astro-ph/0609290

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OGLE 2004-BLG-254: a K3 III Galactic Bulge Giant spatially resolved by a single microlens
A. Cassan ; J.-P. Beaulieu ; P. Fouque ; S. Brillant ; M. Dominik ; J. Greenhill ; D. Heyrovsky ; K. Horne ; U.G. Jorgensen ; D. Kubas ; H.C. Stempels ; C. Vinter ; M.D. Albrow ; D. Bennett ; J.A.R. Caldwell ; J.J. Calitz ; K. Cook ; C. Coutures ; D. Dominis ; J. Donatowicz ; K. Hill ; M. Hoffman ; S. Kane ; J.-B. Marquette ; R. Martin ; P. Meintjes ; J. Menzies ; V.R. Miller ; K.R. Pollard ; K.C. Sahu ; J. Wambsganss ; A. Williams ; A. Udalski ; M.K. Szymanski ; M. Kubiak ; G. Pietrzynski ; I. Soszynski ; K. Zebrun ; O. Szewczyk ; L. Wyrzykowski ;
Date:	11 Sep 2006
Abstract:	We present an analysis of OGLE 2004-BLG-254, a high-magnification and relatively short duration microlensing event in which the source star, a Bulge K3-giant, has been spatially resolved by a point-like lens. We have obtained dense photometric coverage of the event light curve with OGLE and PLANET telescopes, as well as a high signal-to-noise ratio spectrum taken while the source was still magnified by 20, using the UVES/VLT spectrograph. Our dense coverage of this event allows us to measure limb darkening of the source star in the I and R bands. We also compare previous measurements of linear limb-darkening coefficients involving GK-giant stars with predictions from ATLAS atmosphere models. We discuss the case of K-giants and find a disagreement between limb-darkening measurements and model predictions, which may be caused by the inadequacy of the linear limb-darkening law.
Source:	arXiv, astro-ph/0609290
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