What Drives The Mass Loss From Galactic Carbon Stars?

Details What Drives The Mass Loss From Galactic Carbon Stars? What Drives The Mass Loss From Galactic Carbon Stars?

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541812e&link_type=abstract

American Astronomical Society, AAS Meeting #215, #418.12; Bulletin of the American Astronomical Society, Vol. 42, p.276

Astronomy and Astrophysics

Astronomy

Scientific paper

The Spitzer Space Telescope has made it possible to study the infrared spectra of individual carbon stars in nearby galaxies, where both the metallicities and distances are known. Comparisons to Galactic carbon stars suffer from the unknown distances to these sources. Using color-magnitude relations in the near-infrared and thermal infrared calibrated with Spitzer observations of more distant carbon stars, we have estimated the distances to the Galactic sample, which enables us to study the infrared spectral properties as a function of bolometric magnitude. While the amount of dust around a carbon star correlates well with its pulsation period, there is no correlation with bolometric magnitude. This result is interesting in the context of recent work showing that radiation pressure on carbon-rich dust should drive the mass loss from these stars. The pulsation of the central star is also an important driver; it may be more important.

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