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Y.R. Rahal1 , C. Afonso2 , J.-N. Albert1, J. Andersen3, R. Ansari1, É. Aubourg2 , P. Bareyre2, J.-P. Beaulieu4, X. Charlot2, F. Couchot1, C. Coutures2,4, F. Derue1†, R. Ferlet4, P. Fouqué7,8, J.-F. Glicenstein2, B. Goldman2‡, A. Gould5, D. Graff5§, M. Gros2, J. Haı̈ssinski1, C. Hamadache2¶, J. de Kat2, É. Lesquoy2,4, C. Loup4, L. Le Guillou2‖, C.(More)
We present here an analysis of the light curves of 5.3 million stars in the Small Magellanic Cloud observed by EROS (Expérience de Recherche d’Objets Sombres). One star exhibits a variation that is best interpreted as due to gravitational microlensing by an unseen object. This candidate was also reported by the MACHO collaboration. The Einstein radius(More)
We present a test-retest dataset of resting-state fMRI data obtained in 80 cognitively normal elderly volunteers enrolled in the "Pre-symptomatic Evaluation of Novel or Experimental Treatments for Alzheimer's Disease" (PREVENT-AD) Cohort. Subjects with a family history of Alzheimer's disease in first-degree relatives were recruited as part of an on-going(More)
We present a new EROS-2 measurement of the microlensing optical depth toward the Galactic Bulge. Light curves of 5.6 × 106 clump-giant stars distributed over 66 deg2 of the Bulge were monitored during seven Bulge seasons. 120 events were found with apparent amplifications greater than 1.6 and Einstein radius crossing times in the range 5 d < tE < 400 d.(More)
Five years of eros data towards the Small Magellanic Cloud have been searched for gravitational microlensing events, using a new, more accurate method to assess the impact of stellar blending on the efficiency. Four long-duration candidates have been found which, if they are microlensing events, hint at a non-halo population of lenses. Combined with results(More)
We present final results from the first phase of the EROS search for gravitational microlensing of stars in the Magellanic Clouds by unseen deflectors (machos: MAssive Compact Halo Objects). The search is sensitive to events with time scales between 15 minutes and 200 days corresponding to deflector masses in the range 10 to a few M⊙. Two events were(More)
We are conducting a 377 ◦2 proper motion survey in the ∼V and I bands in order to determine the cool white dwarf contribution to the Galactic dark matter. Using the 250 ◦2 for which we possess three epochs, and applying selection criteria designed to isolate halo-type objects, we find no candidates in a 5500 pc effective volume for old, fast MV = 17 white(More)
This is an investigation of the periodluminosity relation of classical Cepheids in samples of different metallicity. It is based on 481 Cepheids in the Large and Small Magellanic Clouds from the blue and red filter CCD observations (most similar to VJ & RJ) of the French EROS microlensing project. The data-set is complete and provides an excellent basis for(More)
We report the discovery of eleven beat Cepheids in the Small Magellanic Cloud, using data obtained by the EROS microlensing survey. Four stars are beating in the fundamental and rst overtone mode (F/1OT), seven are beating in the rst and second overtone (1OT/2OT). The SMC F/1OT ratio is systematically higher than the LMC F/1OT, while the 1OT/2OT period(More)
We report the discovery of two L dwarfs (the new spectral class defined for dwarfs cooler than the M type) in a two-epoch CCD proper motion survey of 413 square degrees, complemented by infrared photometry from DENIS. One of them has a strong lithium line, which for very cool dwarfs is a proof of brown dwarf status. The other is a common proper motion(More)