Planet observations of microlensing event OGLE-1999-BUL-23: Limb-darkening measurement of the source star

被引:66
作者
Albrow, MD
An, J
Beaulieu, JP
Caldwell, JAR
DePoy, DL
Dominik, M
Gaudi, BS
Gould, A
Greenhill, J
Hill, K
Kane, S
Martin, R
Menzies, J
Pogge, RW
Pollard, KR
Sackett, PD
Sahu, KC
Vermaak, P
Watson, R
Williams, A
机构
[1] Space Telescope Sci Inst, Baltimore, MD 21218 USA
[2] Ohio State Univ, Dept Astron, Columbus, OH 43210 USA
[3] CNRS, INSU, Inst Astrophys Paris, F-75014 Paris, France
[4] S African Astron Observ, ZA-7935 Observatory, South Africa
[5] Univ Groningen, Kapteyn Astron Inst, NL-9700 AV Groningen, Netherlands
[6] Univ Tasmania, Dept Phys, Hobart, Tas 7001, Australia
[7] Perth Observ, Bickley, WA 6076, Australia
[8] Univ Canterbury, Dept Phys & Astron, Christchurch 1, New Zealand
关键词
binaries : general; gravitational lensing; stars : atmospheres; stars : fundamental parameters;
D O I
10.1086/319437
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present PLANET observations of OGLE-1999-BUL-23, a binary-lens microlensing event toward the Galactic bulge. PLANET observations in the I and V bands cover the event from just before the first caustic crossing until the end of the event. In particular, a densely sampled second caustic crossing enables us to derive the linear limb-darkening coefficients of the source star : and c(V) = 0.786(-0.078)(+0.080) c(I) = 0.632(-0.037)(+0.047). Combined analysis of the light curve and the color-magnitude diagram suggests that the source star is a G/K subgiant in the Galactic bulge (T-eff similar or equal to 4800 K). The resulting linear limb-darkening coefficient of the source is consistent with theoretical predictions, although it is likely that nonlinearity of the stellar surface brightness profile complicates the interpretation, especially for the I band. The global light curve fit to the data indicates that the event is due to a binary lens of a mass ratio q similar or equal to 0.39 and a projected separation d similar or equal to 2.42. The lens/source relative proper motion is (22.8 +/- 1.5) km s(-1) kpc(-1), typical of bulge/bulge or bulge/disk events.
引用
收藏
页码:759 / 769
页数:11
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