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High-Precision Limb-Darkening Measurement of a K3 Giant Using Microlensing


Fields, DL and Albrow, MD and An, J and Beaulieu, JP and Caldwell, JAR and DePoy, DL and Dominik, M and Gaudi, BS and Gould, A and Greenhill, JG and Hill, KM and Jorgensen, UG and Kane, S and Martin, R and Menzies, J and Pogge, RW and Pollard, KR and Sackett, PD and Sahu, KC and Vermaak, P and Watson, RD and Williams, A and Glicenstein, JF and Hauschmildt, PH, High-Precision Limb-Darkening Measurement of a K3 Giant Using Microlensing, The Astrophysical Journal, 596, (2 I) pp. 1305-1319. ISSN 0004-637X (2003) [Refereed Article]

DOI: doi:10.1086/378196


We obtain high-precision limb-darkening measurements in five bands (V, V E, I E, I, and H) for the K3 III (T eff = 4200 K, [Fe/H] = +0.3, log g = 2.3) source of the Galactic bulge microlensing event EROS BLG-2000-5. These measurements are inconsistent with the predictions of atmospheric models at higher than 10 σ. While the disagreement is present in all bands, it is most apparent in I, I E, and V E, in part because the data are better and in part because the intrinsic disagreement is stronger. We find that when limb-darkening profiles are normalized to have unit total flux, the I-band models for a broad range of temperatures all cross each other at a common point. The solar profile also passes through this point. However, the profile as measured by microlensing does not. We hypothesize that the models have incorporated some aspect of solar physics that is not shared by giant atmospheres.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Greenhill, JG (Dr John Greenhill)
UTAS Author:Hill, KM (Dr Kym Hill)
UTAS Author:Watson, RD (Dr Bob Watson)
ID Code:28945
Year Published:2003
Web of Science® Times Cited:50
Deposited By:Physics
Deposited On:2003-08-01
Last Modified:2004-04-07

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