Cool Star Oxygen Abundances From Spectral Synthesis of TiO Bands

Details Cool Star Oxygen Abundances From Spectral Synthesis of TiO Bands Cool Star Oxygen Abundances From Spectral Synthesis of TiO Bands

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1094..808s&link_type=abstract

COOL STARS, STELLAR SYSTEMS AND THE SUN: Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun.

Physics

Radio-Frequency, Microwave, And Infrared Spectra, Star Formation, Stellar Activity

Scientific paper

Oxygen abundances have been difficult to obtain for low mass stars because their optical spectra are dominated by molecular opacity. Most, if not all, O I absorption lines are blended with background molecular haze. We have measured oxygen abundances using TiO bands in a sample of late-K and early-M dwarfs with previously derived titanium abundances. We obtained oxygen abundances for stars with Teff from 3500 K to 4500 K and iron abundances from [Fe/H] = +0.3 to -1.2. The [O/Fe] of our sample of stars appears to match previous [O/Fe] work for solar and slightly metal poor stars ([Fe/H] from +0.3 to -0.8) but appears over-estimated for stars with [Fe/H]<-0.8.

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