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26 April 2024 |
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Searching for r-process-enhanced stars in the LAMOST Survey I: The Method | | Tian-Yi Chen
; Jian-Rong Shi
; Timothy C. Beers
; Hong-Liang Yan
; Qi Gao
; Chun-Qian Li
; Hai-Ning Li
; Gang Zhao
; | | Date: |
24 Sep 2020 | | Abstract: | The abundance patterns of $r$-process-enhanced stars contain key information
required to constrain the astrophysical site(s) of $r$-process nucleosynthesis,
and to deepen our understanding of the chemical evolution of our Galaxy. In
order to expand the sample of known $r$-process-enhanced stars, we have
developed a method to search for candidates in the LAMOST medium-resolution ($R
sim 7500$) spectroscopic survey by matching the observed spectra to synthetic
templates around the Eu II line at 6645.1 AA. We obtain a sample of 13
metal-poor ($-2.35<{
m [Fe/H]}<-0.91$) candidates from 12,209 unique stars
with 32,774 medium-resolution spectra. These candidates will be further studied
by high-resolution follow-up observations in the near future. Extensions of
this effort to include larger samples of stars, in particular at lower
metallicity, using the strength of the Ba II line at 6496.9 AA, are described. | | Source: | arXiv, 2009.11731 | | Services: | Forum | Review | PDF | Favorites | |
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