Infrared spectral survey of AGB stars in galaxies at different metallicities

Details Infrared spectral survey of AGB stars in galaxies at different metallicities Infrared spectral survey of AGB stars in galaxies at different metallicities

Feb 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007asthe.100...65m&link_type=abstract

The Astronomical Herald (ISSN 0374-2466), Vol. 100, No. 2, p. 65 - 73 (2007)

Astronomy and Astrophysics

Astronomy

Spectra: Agb Stars

Scientific paper

Infrared spectra of extragalactic AGB stars have been obtained, covering the acetylene bands in carbon-rich stars. We found that acetylene is more abundant at lower metallicities amoung the sample in the Large Magellanic Cloud, the Small Magellanic Cloud, the Sagittarius dwarf Spheroidal (dSph) Galaxy, and the Fornax dSph Galaxy. At lower metallicities initial oxygen abundance is lower, and carbon atoms are synthesized in AGB stars resulting in higher carbon-to-oxygen ratios at lower metallicities. Chemical models show that acetylene is abundant at higher carbon-to-oxygen ratio despite low metallicities. Our observations demonstrate that the composition of stellar atmospheres is more sensitive to the elements synthesized inside the star at lower metallicity.

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