1999A&A...351...87D

Query : 1999A&A...351...87D

1999A&A...351...87D - Astronomy and Astrophysics, volume 35187-96 (1999/11-1)

Observation of microlensing towards the galactic spiral arms. EROS II. 2 year survey.

DERUE F., AFONSO C., ALARD C., ALBERT J.N., AMADON A., ANDERSEN J., ANSARI R., AUBOURG E., BAREYRE P., BAUER F., BEAULIEU J.-P., BOUQUET A., CHAR S., CHARLOT X., COUCHOT F., COUTURES C., 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., RICH J., SPIRO M., VIDAL-MADJAR A., VIGROUX L., ZYLBERAJCH S. (The EROS Collaboration)

Abstract (from CDS):

We present the analysis of the light curves of 8.5 million stars observed during two seasons by EROS (Experience de Recherche d'Objets Sombres), in the Galactic plane away from the bulge. Three stars have been found that exhibit luminosity variations compatible with gravitational microlensing effects due to unseen objects. The corresponding optical depth, averaged over four directions, is τ= 0.38+0.53–0.15x10–6. All three candidates have long Einstein radius crossing times (∼70 to 100 days). For one of them, the lack of evidence for a parallax or a source size effect enabled us to constrain the lens-source configuration. Another candidate displays a modulation of the magnification, which is compatible with the lensing of a binary source. The interpretation of the optical depths inferred from these observations is hindered by the imperfect knowledge of the distance to the target stars. Our measurements are compatible with expectations from simple galactic models under reasonable assumptions on the target distances.

Abstract Copyright: ∼

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

Nomenclature: Table 2: EROS2-GSA N (Nos 1-3).

Simbad objects: 12

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Number of rows : 12
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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
3 * tet Mus WR* 13 08 07.1531705448 -65 18 21.679426548 4.71 5.50 5.53 5.44 5.40 WC5+B0III 336 0
4 EQ J1611-5256 ? 16 11 50.2 -52 56 49           ~ 1 0
5 EROS2-GSA 2 * 16 11 50.2 -52 56 49     20.9   18.6 ~ 5 0
6 EQ J1616-5437 ? 16 16 26.7 -54 37 49           ~ 1 0
7 EROS2-GSA 3 * 16 16 26.7 -54 37 49     19.1   17.7 ~ 3 0
8 * gam Nor ** 16 18 -50.1           ~ 10 1
9 EROS2-GSA 1 * 18 29 09.0 -14 15 09     21.4   18.3 ~ 4 0
10 EQ J1829-1415 ? 18 29 09.0 -14 15 09           ~ 1 0
11 * gam Sct * 18 29 11.8505713195 -14 33 56.890493432   4.739 4.675     A1IV/V 114 0
12 * bet Sct SB* 18 47 10.4742156840 -04 44 52.342960488 6.15 5.31 4.22 3.43 2.86 G4IIa 194 0

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