In:
Research in Astronomy and Astrophysics, IOP Publishing, Vol. 22, No. 7 ( 2022-07-01), p. 075005-
Abstract:
We report the discovery of two r -process-enhanced stars with [Fe/H] 〉 −0.6 dex selected from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) survey. Three candidate stars have been selected from the LAMOST medium-resolution ( R ∼ 7500) spectroscopic survey, and the followed-up high signal-to-noise ratio and high-resolution ( R ∼ 31,500) spectra are obtained with the ARC Echelle Spectrograph mounted on the 3.5 m telescope at the Apache Point Observatory, which allow us for the determination of stellar atmospheric parameters and abundances of 20 elements. Among these three r -process-enhanced candidate stars, TYC 1710-933-1 and TYC 2858-372-1 have [Eu/Fe] higher than 0.3 dex and [Ba/Eu] lower than 0.0 dex, thus, can be identified as new r -process-enhanced objects. TYC 2858-372-1 shows similar r + s -process pattern to the Sun. TYC 1710-933-1 presents enhancement of the r -process elements of Nd and Eu. Our work indicates that the enrichment mechanisms of the heavy neutron-capture elements are complicated for metal-rich stars.
Type of Medium:
Online Resource
ISSN:
1674-4527
DOI:
10.1088/1674-4527/ac6f4d
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2022
detail.hit.zdb_id:
2511247-8
SSG:
6,25
SSG:
16,12