Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-09-11
Astronomy and Astrophysics
Astrophysics
14 pages, 8 figures, accepted for publication in A&A (04/09/2006)
Scientific paper
10.1051/0004-6361:20054414
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.
Albrow Michael D.
Beaulieu J.-Ph.
Bennett Dave
Brillant Stéphane
Caldwell John A. R.
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