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| - Galactic mass-losing AGB stars probed with the IRTS. II
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| - We are using the 2002 data-release from the Japanese space experiment IRTS to investigate the spatial distribution of galactic mass-losing (> $2\times 10^{-8}$$M_{odot}$ yr -1) AGB stars and the relative contribution of C-rich and O-rich ones to the replenishment of the ISM. Our sample contains 126 C-rich and 563 O-rich sources which are sorted on the basis of the molecular bands observed in the range 1.4-4.0 μm, and for which we estimate distances and mass loss rates from near-infrared photometry ( K and L'). There is a clear dependence on galactocentric distance, with O-rich sources outnumbering C-rich ones for $r_{\rm GC}< 8$ kpc, and the reverse for $r_{\rm GC}> 10$ kpc. The contribution to the replenishment of the ISM by O-rich AGB stars relative to C-rich ones follows the same trend. Although they are rare (~10% in our sample), sources with 10 -6$M_{odot}$ yr -1$< \dot{M} <\,10^{-5}$$M_{odot}$ yr -1 dominate the replenishment of the ISM by contributing to ~50% of the total of the complete sample. We find 2 carbon stars at more than 1 kpc from the Galactic Plane, that probably belong to the halo of our Galaxy.
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