Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High-resolution spectroscopic analysis of a large sample of Li-rich
  giants found by LAMOST   The discovery of Li-rich giant has cast a new challenge for the standard
stellar evolution models, and to resolve this issue, the number of this type
object has been rapidly increased because of the development of worldwide
surveys these days. Taking advantage of the Large Sky Area Multi-Object Fiber
Spectroscopic Telescope survey, 44 newly Li-rich giants are reported, which are
confirmed with high-resolution observations. Based on the high-resolution and
high signal-to-noise spectra, we derived the atmospheric parameters and
elemental abundances with the spectral synthesis method. We performed a
detailed analysis of their evolutionary stages, infrared excess, projected
rotational velocity (v sin i), and the stellar population. We find that (1) The
Li-rich giants concentrate at the evolutionary status of the red giant branch
bump, red clump, and asymptotic giant branch; (2) Three of them are fast
rotators and none exhibit infrared excess. Our results imply that the origins
of Li enrichment are most likely to be associated with the extra mixing in the
stellar interior, and the external sources maybe only make a minor
contribution. Moreover, various Li-rich episodes take place at different
evolutionary stages.

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The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc