Presentation 1 : Poster
Outer bulge and thin disc of the Milky Way.
Sebastien Picaud, Emmanuel Chereul, Annie Robin
Using a Monte Carlo fitting method based on Besancon Model simulations and infrared data (magnitude K and color J-K) in bulge region (mostly fieds are in longitudes -12 < l < 12 degrees and latitudes -4 < b < 4 degrees), we deduce the parameters of the triaxial outer bulge (or bar) and the old thin disc of our Galaxy. First results show a very oblate outer bulge, with the major axis almost on the galactic plane and with an angle from the line Sun - Galactic Center of about 11 degrees. The thin disc has got an important hole. These results are consistent with other studies, especially studies based on star counts.
Presentation 2 : Poster
The long thin in-plane bar in the Milky Way
Sebastien Picaud, Francisco Garzon
Our Galaxy seems to own, in addition with the oblate outer bulge (see poster of Picaud, Chereul and Robin) a longer and thiner in-plane bar (Lopez Carredoira, 2001). We compared stars counts and color-magnitude diagrams from the Besancon Model simulations (without this bar) with stars counts from observations at the Teide Observatory (near infrared camera CAIN. J, H and Kshort bands) and show the existence of such a bar.