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2002•Publications of the Astronomical Society of JapanOpen access

α Element Abundances in Mildly Metal-Poor Stars

Hong-mei Qiu, Gang Zhao, Masahide Takada‐Hidai, Yuqin Chen, Yoichi Takeda, Kunio Noguchi, Kozo Sadakane, Wako Aoki

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Abstract

Abstract We present [O/Fe] and other $\alpha$-elements/Fe ratios in a sample of 24 mildly metal-poor stars. The sample stars are thought to be brighter than 9.0 magnitude and have available $\mathit{uvby}$ photometric data. Also, based on the typical LTE abundance analysis, we find that [Si/Fe] and [Ca/Fe] are correlated with each other. Combining the kinematic data and the metallicity, we can classify the sample stars into three groups. An abundance analysis shows some evidence that these groups are chemically discrete from each other. Further, the general trend of a decreasing overabundance of the $\alpha$ elements with increasing metallicity has been confirmed.

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Abstract We present [O/Fe] and other $\alpha$-elements/Fe ratios in a sample of 24 mildly metal-poor stars. The sample stars are thought to be brighter than 9.0 magnitude and have available $\mathit{uvby}$ photometric data. Also, based on the typical LTE abundance analysis, we find that [Si/Fe] and [Ca/Fe] are correlated with each other. Combining the kinematic data and the metallicity, we can classify the sample stars into three groups. An abundance analysis shows some evidence that these groups are chemically discrete from each other. Further, the general trend of a decreasing overabundance of the $\alpha$ elements with increasing metallicity has been confirmed.

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Available abstract

Abstract We present [O/Fe] and other $\alpha$-elements/Fe ratios in a sample of 24 mildly metal-poor stars. The sample stars are thought to be brighter than 9.0 magnitude and have available $\mathit{uvby}$ photometric data. Also, based on the typical LTE abundance analysis, we find that [Si/Fe] and [Ca/Fe] are correlated with each other. Combining the kinematic data and the metallicity, we can classify the sample stars into three groups. An abundance analysis shows some evidence that these groups are chemically discrete from each other. Further, the general trend of a decreasing overabundance of the $\alpha$ elements with increasing metallicity has been confirmed.

Key concepts: Metallicity, Stars, Physics, Astrophysics, Abundance (ecology), Metal, Astronomy, Chemistry

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