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

Details Galactic mass-losing AGB stars probed with the IRTS. I. Galactic mass-losing AGB stars probed with the IRTS. I.

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...376..997l&link_type=abstract

Astronomy and Astrophysics, v.376, p.997-1010 (2001)

Astronomy and Astrophysics

Astrophysics

35

Stars: Carbon, Stars: Mass-Loss, Stars: Agb And Post-Agb, Ism: Evolution, Galaxy: Solar Neighbourhood, Infrared: Stars

Scientific paper

AGB mass-losing sources are easy to identify and to characterize in the near-infrared range (1-5 mu m). We make use of the near-infrared data acquired by the Japanese space experiment IRTS to study a sample of sources detected in the 2 celestial strips surveyed by the IRTS. Mass-loss rates and distances are estimated for 40 carbon-rich sources and 86 oxygen-rich sources of which 8 are probably of S-type. Although the sample is small, one sees a dependence of the relative contribution of the two kinds of sources to the replenishment of the interstellar medium (ISM) on the galactocentric distance. E.g. from 6 to 8 kpc, oxygen-rich sources in our sample contribute 10-12 times as much as carbon rich sources, whereas from 10 to 12 kpc, the latters contribute 3-4 times as much as the formers. Therefore, one would expect a gradient in the composition of the ISM between 6 and 12 kpc from the Galactic Centre, especially in its dust component. Most of the replenishment (>50%) by AGB stars is due to sources with mass-loss rate larger than 10-6 Msun yr-1.

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