2005A&A...439..645R

Query : 2005A&A...439..645R

2005A&A...439..645R - Astronomy and Astrophysics, volume 439, 645-650 (2005/8-4)

Determination of stellar shape in microlensing event MOA 2002-BLG-33.

RATTENBURY N.J., ABE F., BENNETT D.P., BOND I.A., CALITZ J.J., CLARET A., COOK K.H., FURUTA Y., GAL-YAM A., GLICENSTEIN J.-F., HEARNSHAW J.B., HAUSCHILDT P.H., KILMARTIN P.M., KURATA Y., MASUDA K., MAOZ D., MATSUBARA Y., MEINTJES P.J., MONIEZ M., MURAKI Y., NODA S., OFEK E.O., OKAJIMA K., PHILPOTT L., RHIE S.H., SAKO T., SULLIVAN D.J., SUMI T., TERNDRUP D.M., TRISTRAM P.J., WOOD J., YANAGISAWA T. and YOCK P.C.M.

Abstract (from CDS):

We report a measurement of the shape of the source star in microlensing event MOA 2002-BLG-33. The lens for this event was a close binary whose centre-of-mass passed almost directly in front of the source star. At this time, the source star was closely bounded on all sides by a caustic of the lens. This allowed the oblateness of the source star to be constrained. We found that a/b=1.02+0.04–0.02 where a and b are its semi-major and semi-minor axes respectively. The angular resolution of this measurement is approximately 0.04µarcsec. We also report HST images of the event that confirm a previous identification of the source star as an F8-G2 turn-off main-sequence star.

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Journal keyword(s): gravitational lensing - stars: atmospheres - stars: rotation

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 * alf Eri Be* 01 37 42.84548 -57 14 12.3101 -0.36 0.30 0.46 0.49 0.60 B6Vpe 473 1
2 MOA 2002-BLG-33 * 17 58 24.60 -29 06 11.3           ~ 15 0
3 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2686 1
4 * alf Aql dS* 19 50 46.99855 +08 52 05.9563 1.07 0.98 0.76 0.62 0.49 A7Vn 875 1

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