1998A&A...337L..17A

Query : 1998A&A...337L..17A

1998A&A...337L..17A - Astronomy and Astrophysics, volume 337L17-20 (1998/9-1)

EROS 2 intensive observation of the caustic crossing of microlensing event MACHO SMC-98-1.

AFONSO C., ALARD C., ALBERT J.N., ANDERSEN J., ANSARI R., AUBOURG E., BAREYRE P., BAUER F., BEAULIEU J.P., BOUQUET A., CHAR S., CHARLOT X., COUCHOT F., COUTURES C., DERUE F., FERLET R., GLICENSTEIN J.F., GOLDMAN B., GOULD A., GRAFF D., GROS M., HAISSINSKI J., HAMILTON J.C., HARDIN D., DE KAT J., KIM A., LASSERRE T., LESQUOY E., LOUP C., MAGNEVILLE C., MANSOUX B., MARQUETTE J.B., MAURICE E., MILSZTAJN A., MONIEZ M., PALANQUE-DELABROUILLE N., PERDEREAU O., PREVOT L., REGNAULT N., RENAULT C., RICH J., SPIRO M., VIDAL-MADJAR A., VIGROUX L. and ZYLBERAJCH S.

Abstract (from CDS):

We report on intensive photometric monitoring on 18 June 1998 of MACHO SMC-98-1, a binary-lens microlensing event seen toward the Small Magellanic Cloud (SMC). The observations cover 5.3 hours (UT 5:17-10:37), and show a sharp drop of 1.8mag during the first 1.8 hours, followed by an abrupt flattening at UT 7:08±0:02. We interpret the kink at 7:08 as the end of the second caustic crossing (when the source first moved completely outside the caustic). These results indicate that µsinφ≲1.5km/s/kpc at the 2σ level, where µ is the proper motion of the lens (relative to the line of sight to the source), and φ is the unknown (and so random) angle of the caustic crossing. Hence, the lens probably does not lie in either the Galactic halo or disk and so is most likely in the SMC itself. Our data can be combined with those of other groups to give more precise constraints on the proper motion (and hence the nature) of the lens.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: halo - Galaxy: kinematics and dynamics - Galaxy: stellar content - Magellanic Clouds - dark matter - gravitational lensing

CDS comments: MACHO 97-SMC-1 = [PAA98] EROS SMC 1

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 - 2026 		#notes
1 MACHO 208.15683.4237 * 00 45 35.3 -72 52 33           ~ 65 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
3 MACHO 97-SMC-1 * 01 00 05.6 -72 15 03   18.01 17.9 18.14   ~ 27 0
4 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0

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