Chemical Composition of the Carbon-rich, Extremely Metal Poor Star CS 29498−043: A New Class of Extremely Metal Poor Stars with Excesses of Magnesium and Silicon
- 10 September 2002
- journal article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 576 (2), L141-L144
- https://doi.org/10.1086/343761
Abstract
We analyze a high-resolution, high signal-to-noise spectrum of the carbon-rich, ex- tremely metal-poor star CS 29498-043, obtained with the Subaru Telescope High Dis- persion Spectrograph. We find its iron abundance is extremely low ((Fe/H) = 3.7), placing it among the few stars known with (Fe/H) � 3.5, while Mg and Si are sig- nificantly overabundant ((Mg/Fe) = +1.8, and (Si/Fe) = +1.1) compared with stars of similar metallicity without carbon excess. Overabundances of N and Al were also found. These characteristics are similar to the carbon-rich, extremely metal-poor star CS 22949-037. Though the sample is small, our discovery of CS 29498-043 suggests the existence of a class of extremely metal-poor stars with large excesses of C, N, Mg, and Si.Keywords
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