High‐Precision Limb‐Darkening Measurement of a K3 Giant Using Microlensing | Zendy

Dale L. Fields | Zendy; Michael D. Albrow | Zendy; J. An | Zendy; JeanPhilippe Beaulieu | Zendy; J. A. R. Caldwell | Zendy; D. L. DePoy | Zendy; M. Dominik | Zendy; B. S. Gaudi | Zendy; Andrew Gould | Zendy; J. Greenhill | Zendy; K. Hill | Zendy; U. G. Jørgensen | Zendy; Stephen R. Kane | Zendy; R. Martin | Zendy; J. W. Menzies | Zendy; Richard W. Pogge | Zendy; K. R. Pollard | Zendy; P. D. Sackett | Zendy; K. C. Sahu | Zendy; P. Vermaak | Zendy; R. Watson | Zendy; A. Williams | Zendy; J. F. Glicenstein | Zendy; P. H. Hauschildt | Zendy

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

Author(s) -

Dale L. Fields,

Michael D. Albrow,

J. An,

JeanPhilippe Beaulieu,

J. A. R. Caldwell,

D. L. DePoy,

M. Dominik,

B. S. Gaudi,

Andrew Gould,

J. Greenhill,

K. Hill,

U. G. Jørgensen,

Stephen R. Kane,

R. Martin,

J. W. Menzies,

Richard W. Pogge,

K. R. Pollard,

P. D. Sackett,

K. C. Sahu,

P. Vermaak,

R. Watson,

A. Williams,

J. F. Glicenstein,

P. H. Hauschildt

Publication year - 2003

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/378196

Subject(s) - gravitational microlensing , physics , astrophysics , limb darkening , flux (metallurgy) , bulge , sigma , astronomy , galaxy , stars , materials science , metallurgy

We obtain high-precision limb-darkening measurements in five bands (V, V_E,I_E, I, and H) for the K3 III (Teff=4200 K, [Fe/H]=+0.3, log(g)=2.3) source ofthe Galactic bulge microlensing event EROS BLG-2000-5. These measurements areinconsistent with the predictions of atmospheric models at >10 sigma. While thedisagreement is present in all bands, it is most apparent in I, I_E and V_E, inpart because the data are better and in part because the intrinsic disagreementis stronger. We find that when limb-darkening profiles are normalized to haveunit total flux, the I-band models for a broad range of temperatures all crosseach other at a common point. The solar profile also passes through this point.However, the profile as measured by microlensing does not. We conjecture thatthe models have incorporated some aspect of solar physics that is not shared bygiant atmospheres.Comment: Submitted to ApJ, 28 pages including 8 figure

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