SIMBAD references

2015ApJ...805..146X - Astrophys. J., 805, 146 (2015/June-1)

Newly discovered alpha-poor stars in the solar neighborhood.

XING Q.F. and ZHAO G.

Abstract (from CDS):

We present an abundance analysis for two newly discovered α-poor stars based on high-resolution spectroscopy. These stars were previously identified in the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Data Release 1 as candidate α-poor stars. We observed these candidate α-poor stars with the Magellan Inamori Kyocera Echelle (MIKE) spectrograph on the 6.5 m Magellan-Clay Telescope located at Las Campanas Observatory. This high-resolution analysis confirms the low [α/Fe] abundance ratios for these stars compared to those of the majority of Galactic stars with comparable metallicities ([Fe/H] ∼ ∼ -0.5). The large deficiencies of α-elements suggest that these stars possess an anomalous chemical enrichment history. To have found such α-poor stars in our sample indicates that large scatters of the α-element abundance ratios may exist near solar metallicity. These results also demonstrate that our method is capable of selecting α-poor stars from low-resolution stellar spectra.

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Journal keyword(s): Galaxy: formation - stars: abundances - stars: atmospheres

Simbad objects: 6

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