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Enormous Li-enhancement preceding red giant phases in low-mass stars in the Milky Way halo
Haining Li, Wako Aoki, Tadafumi Matsuno +4
Li abundances in the bulk of low-mass metal-poor stars are well reproduced by stellar evolution models adopting a constant initial abundance. However, a small number of stars have…
The Milky Way's circular velocity curve and its constraint on the Galactic mass with RR Lyrae stars
Iminhaji Ablimit, Gang Zhao
We present a sample of 1148 ab-type RR Lyrae (RRLab) variables identified from Catalina Surveys Data Release 1, combined with SDSS DR8 and LAMOST DR4 spectral data. We firstly use…
Absolute Magnitudes of Seismic Red Clumps in the Kepler Field and SAGA: the age dependency of the distance scale
Y. Q. Chen, L. Casagrande, G. Zhao +4
Red clump stars are fundamental distance indicators in astrophysics, although theoretical stellar models predict a dependence of absolute magnitudes with ages. This effect is parti…
Chemical Composition of Young Stars in the Leading Arm of the Magellanic System
Lan Zhang, Christian Moni Bidin, Dana I. Casetti-Dinescu +6
Chemical abundances of eight O- and B-type stars are determined from high-resolution spectra obtained with the MIKE instrument on the Magellan 6.5m Clay telescope. The sample is se…