Assessment of the Tip-AGB Mass-loss Using Synthetic Stellar Samples in the (MBol, J--K) Diagram

Details Assessment of the Tip-AGB Mass-loss Using Synthetic Stellar Samples in the (MBol, J--K) Diagram Assessment of the Tip-AGB Mass-loss Using Synthetic Stellar Samples in the (MBol, J--K) Diagram

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12.1063s&link_type=abstract

The Future of Cool-Star Astrophysics: 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (2001 July 30 - August

Astronomy and Astrophysics

Astrophysics

Tip-Agb, Mass-Loss

Scientific paper

A new approach is presented here to interpret the large amount of IR survey data in a most direct and quantitative way, by means of modeling the (MBol, J-K) diagram. Combining stellar evolution with dust-driven wind models, we have produced a grid of stellar evolution tracks (for solar abundances) with a mass-loss description for carbon-rich tip-AGB stars derived from the latest version of the self-consistent, pulsating Berlin wind models. By random distribution in age and mass, dependent only on the given IMF, a large synthetic sample of tip-AGB cool giant stars with very strong mass loss has then been generated, including relevant IR properties.
The synthetic cool giant sample presented here is modeled on the solar neighbourhood (d < 50 pc) and its IMF, for 1000 × more stars. It provides a detailed inventory of the individual stellar mass loss, the stellar masses (present and initial) and ages. >From 5067 giants with B--V > 1.4, only 14 objects are found in their brief (final 30 000 years) superwind phase (J - K > 6.5). However, these 14 carbon-rich tip-AGB giants produce more than 1/2 of the collective mass-loss of the whole stellar sample. Since these crucial objects are likely to be under-represented in observed samples, a synthetic sample is required to account for them without bias.

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