Metallic-line Stars Identified from Low-resolution Spectra of LAMOST DR5

@article{Qin2019MetalliclineSI,
  title={Metallic-line Stars Identified from Low-resolution Spectra of LAMOST DR5},
  author={Li Qin and Ali Luo and Wen Hou and Yin-Bi Li and Shuo Zhang and Rui Wang and Lili Wang and Xiaoming Kong and Jin-shu Han},
  journal={The Astrophysical Journal Supplement Series},
  year={2019}
}
LAMOST DR5 released more than 200,000 low resolution spectra of early-type stars with S/N>50. Searching for metallic-line (Am) stars in such a large database and study of their statistical properties are presented in this paper. Six machine learning algorithms were experimented with using known Am spectra, and both the empirical criteria method(Hou et al. 2015) and the MKCLASS package(Gray et al. 2016) were also investigated. Comparing their performance, the random forest (RF) algorithm won… Expand
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References

SHOWING 1-10 OF 50 REFERENCES
A large sample of metallic-line star candidates from LAMOST Data Release 1
We present a sample of metallic-line star (Am) candidates from the Large sky Area Multi-Object ber Spectroscopic Telescope Data Release one (LAMOST DR1). According to the characteristic ofExpand
Abundance analysis of seven $\mathsf{\delta}$ Scuti stars
Context. The current knowledge of the abundance pattern in δ Scuti stars is based on analysis of just a few field stars. Aims. We aim to determine the general chemical properties of the atmospheresExpand
THE SEGUE STELLAR PARAMETER PIPELINE. I. DESCRIPTION AND COMPARISON OF INDIVIDUAL METHODS
We describe the development and implementation of the Sloan Extension for Galactic Exploration and Understanding (SEGUE) Stellar Parameter Pipeline (SSPP). The SSPP is derived, using multipleExpand
Chemical composition of A and F dwarf members of the Coma Berenices open cluster
Aims. Abundances of 18 chemical elements have been derived for 11 A (normal and Am) and 11 F dwarfs members of the Coma Berenices open cluster in order to set constraints on evolutionary modelsExpand
A New Photometric Study of Ap and Am Stars in the Infrared
In this paper, 426 well known confirmed Ap and Am stars are photometrically studied in the infrared. The 2MASS, Wide-field Infrared Survey Explorer (WISE), and IRAS data are employed to makeExpand
The effect of rotation on the abundances of the chemical elements of the A-type stars in the Praesepe cluster ?
Aims. We study how chemical abundances of late B‐, A‐ and early F‐type stars evolve with time, and we search for correlations between the abundance of chemical elements and other stellar parameters,Expand
CAOS spectroscopy of Am stars Kepler targets
The Kepler space mission and its K2 extension provide photometric time series data with unprecedented accuracy. These data challenge our current understanding of the metallic-lined A stars (Am stars)Expand
Late stages of the evolution of A-type stars on the main sequence: comparison between observed chemical abundances and diffusion models for 8 Am stars of the Praesepe cluster
Aims. We aim to provide observational constraints on diffusion models that predict peculiar chemical abundances in the atmospheres of Am stars. We also intend to check if chemical peculiarities andExpand
Measuring Reddening with Sloan Digital Sky Survey Stellar Spectra and Recalibrating SFD
We present measurements of dust reddening using the colors of stars with spectra in the Sloan Digital Sky Survey. We measure reddening as the difference between the measured and predicted colors of aExpand
The radial velocity experiment (RAVE): First data release
TLDR
The first data release of the Radial Velocity Experiment (RAVE) is presented and it is demonstrated that the radial velocities derived for the first data set do not show any systematic trend with color or signal-to-noise ratio. Expand
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