2010A&A...518A..51F

Query : 2010A&A...518A..51F

2010A&A...518A..51F - Astronomy and Astrophysics, volume 518, A51-51 (2010/7-2)

OGLE 2008-BLG-290: an accurate measurement of the limb darkening of a galactic bulge K giant spatially resolved by microlensing.

FOUQUE P., HEYROVSKY D., DONG S., GOULD A., UDALSKI A., ALBROW M.D., BATISTA V., BEAULIEU J.-P., BENNETT D.P., BOND I.A., BRAMICH D.M., CALCHI NOVATI S., CASSAN A., COUTURES C., DIETERS S., DOMINIK M., DOMINIS PRESTER D., GREENHILL J., HORNE K., JORGENSEN U.G., KOZLOWSKI S., KUBAS D., LEE C.-H., MARQUETTE J.-B., MATHIASEN M., MENZIES J., MONARD L.A.G., NISHIYAMA S., PAPADAKIS I., STREET R., SUMI T., WILLIAMS A., YEE J.C., BRILLANT S., CALDWELL J.A.R., COLE A., COOK K.H., DONATOWICZ J., KAINS N., KANE S.R., MARTIN R., POLLARD K.R., SAHU K.C., TSAPRAS Y., WAMBSGANSS J., ZUB M., DEPOY D.L., GAUDI B.S., HAN C., LEE C.-U., PARK B.-G., POGGE R.W., KUBIAK M., SZYMANSKI M.K., PIETRZYNSKI G., SOSZYNSKI I., SZEWCZYK O., ULACZYK K., WYRZYKOWSKI L., ABE F., FUKUI A., FURUSAWA K., GILMORE A.C., HEARNSHAW J.B., ITOW Y., KAMIYA K., KILMARTIN P.M., KORPELA A.V., LIN W., LING C.H., MASUDA K., MATSUBARA Y., MIYAKE N., MURAKI Y., NAGAYA M., OHNISHI K., OKUMURA T., PERROTT Y., RATTENBURY N.J., SAITO T., SAKO T., SATO S., SKULJAN L., SULLIVAN D., SWEATMAN W., TRISTRAM P.J., YOCK P.C.M., ALLAN A., BODE M.F., BURGDORF M.J., CLAY N., FRASER S.N., HAWKINS E., KERINS E., LISTER T.A., MOTTRAM C.J., SAUNDERS E.S., SNODGRASS C., STEELE I.A., WHEATLEY P.J., ANGUITA T., BOZZA V., HARPSOE K., HINSE T.C., HUNDERTMARK M., KJAERGAARD P., LIEBIG C., MANCINI L., MASI G., RAHVAR S., RICCI D., SCARPETTA G., SOUTHWORTH J., SURDEJ J., THOENE C.C., RIFFESER A., SEITZ S. and BENDER R.

Abstract (from CDS):

Not only is gravitational microlensing a successful tool for discovering distant exoplanets, but it also enables characterization of the lens and source stars involved in the lensing event. In high-magnification events, the lens caustic may cross over the source disk, which allows determination of the angular size of the source and measurement of its limb darkening. When such extended-source effects appear close to maximum magnification, the resulting light curve differs from the characteristic Paczynski point-source curve. The exact shape of the light curve close to the peak depends on the limb darkening of the source. Dense photometric coverage permits measurement of the respective limb-darkening coefficients. In the case of the microlensing event OGLE 2008-BLG-290, the K giant source star reached a peak magnification at about 100. Thirteen different telescopes have covered this event in eight different photometric bands. Subsequent light-curve analysis yielded measurements of linear limb-darkening coefficients of the source in six photometric bands. The best-measured coefficients lead to an estimate of the source effective temperature of about 4700⁺¹⁰⁰_–200K. However, the photometric estimate from colour-magnitude diagrams favours a cooler temperature of 4200±100K. Because the limb-darkening measurements, at least in the CTIO/SMARTS2 V_s- and I_s-bands, are among the most accurate obtained, the above disagreement needs to be understood. A solution is proposed, which may apply to previous events where such a discrepancy also appeared.

Abstract Copyright: ∼

Journal keyword(s): gravitational lensing: micro - techniques: high angular resolution - stars: atmospheres - stars: individual: OGLE 2008-BLG-290

Nomenclature: Table 1: [FHD2010] WW component (Nos NE component, SW component).

Simbad objects: 20

Full paper

View the references in ADS

Number of rows : 20

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag V	Mag I	Sp type	#ref 1850 - 2023	#notes
1	MACHO 208.15683.4237	*	00 45 35.3	-72 52 33			~	64	0
2	EWS 2003-BUL-238	*	17 45 50.34	-22 40 58.1			K2III	12	0
3	EWS 2002-BUL-69	*	17 48 01.00	-21 16 09.3			G5III	17	0
4	EROS BLG 2000 5	*	17 53 11.43	-30 55 34.4			K3III	36	0
5	MOA 2009-BLG-411	*	17 53 58.400	-29 44 56.01			~	7	0
6	MOA 2008-BLG-310	*	17 54 14.53	-34 46 41.0			GV	49	1
7	MACHO 97-BLG-41	**	17 56 20.7	-28 47 42			~	54	1
8	EWS 2004-BUL-254	*	17 56 36.20	-32 33 01.8			K3III	5	0
9	EWS 2003-BUL-262	*	17 57 08.51	-30 20 05.1			~	7	0
10	OGLE 2004-BUL-482	*	17 57 30.6268943160	-30 51 30.607919388		14.57	MIII	6	0
11	MOA 2002-BLG-33	*	17 58 24.60	-29 06 11.3			~	15	0
12	[FHD2010] SW component	*	17 58 29.296	-27 59 22.00			~	1	0
13	2MASS J17582933-2759215	NIR	17 58 29.334	-27 59 21.53			~	1	0
14	OGLE 2008-BUL-290	*	17 58 29.34	-27 59 22.4			K3III	6	0
15	[FHD2010] NE component	*	17 58 29.362	-27 59 21.45			~	1	0
16	MACHO 97-BLG-28	*	18 00 33.9	-28 01 10	18.1		~	31	0
17	NAME Baade Window	reg	18 03.5	-30 01			~	588	3
18	OGLE BUL-SC19 26606	*	18 07 45.14	-27 33 15.4			~	22	0
19	MOA 2007-BLG-400	*	18 09 41.980	-29 13 26.95			~	43	1
20	MOA 2007-BLG-400b	Pl	18 09 41.980	-29 13 26.95			~	33	1

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