SIMBAD references

2003A&A...403..943L - Astronomy and Astrophysics, volume 403, 943-954 (2003/6-1)

Galactic mass-losing AGB stars probed with the IRTS. II.


Abstract (from CDS):

We are using the 2002 data-release from the Japanese space experiment IRTS to investigate the spatial distribution of galactic mass-losing (>2x10–8M/yr) 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 1.4-4.0µm, 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 rGC<8kpc, and the reverse for rGC>10kpc. 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 10–6M/yr<{dot}(M)<10–5M/yr 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 1kpc from the Galactic Plane, that probably belong to the halo of our Galaxy.

Abstract Copyright:

Journal keyword(s): stars: carbon - stars: mass-loss - stars: AGB and post-AGB - ISM: evolution - Galaxy: solar neighbourhood - infrared: stars

VizieR on-line data: <Available at CDS (J/A+A/403/943): table3.dat table4.dat>

Nomenclature: Tables 3, 4: [LTY2003] NIRS HHMMm+DDMM N=126+563.

Simbad objects: 1058

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