Infrared Molecular Bands of Carbon-Rich Stars in Nearby Galaxies

Details Infrared Molecular Bands of Carbon-Rich Stars in Nearby Galaxies Infrared Molecular Bands of Carbon-Rich Stars in Nearby Galaxies

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..378..450m&link_type=abstract

Why Galaxies Care About AGB Stars: Their Importance as Actors and Probes. ASP Conference Series, Vol. 378, proceedings of the co

Astronomy and Astrophysics

Astronomy

Scientific paper

We have obtained infrared spectra of carbon stars in four nearby galaxies -- the Large and Small Magellanic Clouds, the Sagittarius dwarf spheroidal galaxy, and the Fornax dwarf spheroidal galaxy. These stars were observed using the Infrared Spectrometer (IRS) onboard the Spitzer Space Telescope which covers 5 to 35 μm, and the Infrared Spectrometer And Array Camera (ISAAC) on the Very Large Telescope which covers the 3 μm region. HCN, CH and C_2H_2 bands are identified in the spectra. We found that C_2H_2 bands are prominent features at 3--15 μm among extragalactic carbon stars, which is not always the case for Galactic carbon stars. We argue that the difference is caused by systematically high C/O ratios in low-metallicity environments.

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