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arxiv: astro-ph/0609290 · v1 · submitted 2006-09-11 · 🌌 astro-ph

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
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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
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keywords eventlimb-darkeningoglesourceblg-254bulgecoveragedense
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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.

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