Object DUO 2: A New Binary Lens Candidate

We present the light curve of an unusual variable object, DUO 2, detected during the search for microlensing events by the DUO project. The star remained stable for more than 150 days before it brightened by more than two magnitudes in 6 days in the B and R bands. The light curves are achromatic during the variability. We consider possible explanations of the photometric behavior, with particular emphasis on the binary lens interpretation of the event. The masses of the lenses are quite small, with the companion possibly in the range of a brown dwarf or even a few times of Jupiter. We report evidence of blending of the source by a companion through the first detection of shift in the light centroid among all the microlensing experiments. This shift sets a lower limit of $0.3^{\prime\prime}$ on the separation between the stars. The best lens model obtained requires moderate blending, which was what motivated us to check the centroid shift that was subsequently found. The best lens model predicts a separation of $1^{\prime\prime}$ between the two blended stars. This prediction was recently tested using two CCD images taken under good seeing conditions. Both images show two components. Their separation and position angle are in good agreement with our model.Comment: uuencoded, compressed PostScript, 4 pages, 4 figures (in text). Accepted for publication in Astronomy and Astrophysics Letter

Les effets de la saisonnalité touristique sur l'emploi des moniteurs de sports nautiques dans le département des Landes

The nautical activities are an important offering of the Landes coast in summer. The variety of practice, the strong seasonality in tourist numbers and limited practice spaces make professional instructors – whose specialty is to discover or introduce water activities to customers overwhelmingly summer – is increasingly subjected to quantitative process control by local authorities. The attractiveness of the coastal Landes temporally marked and continuous rise in recent years of sports teaching produce effects on the profession. Symbolic and economic profi ts generated by the Landes are not conform to the benefi ts that can hope to expect, professionally speaking, the sports instructors sector