TYC 8327-1678-1: a new super lithium-rich K giant
Monthly Notices of the Royal Astronomical Society(2020)
摘要
In this work, we show that TYC 8327-1678-1 is a low-mass red giant star with a super lithium abundance in its atmosphere. For this, we used high-resolution spectroscopy to determine atmospheric parameters, the chemical abundances of the light elements and the isotopic ratio
12
C/
13
C using the spectral synthesis techniques and the equivalent width measurements. Also, we used theoretical evolutionary tracks to find out the mass and the evolutionary stage of TYC 8327-1678-1. The lithium abundance was determined using the Li i resonance doublet at 6708 Å and the subordinate line at 6104 Å that yielding a mean value of
$\log \, \epsilon {\rm (Li)_{NLTE}}\, =\, 3.48$
. The projected rotational velocity (
$v\, \sin \, i$
) has been determined using spectral synthesis based on the isolated Fe i lines. Our results show that TYC 8327-1678-1 has a mass of
$M\, =\, 1.60$
$\pm \, 0.20\, {\rm M}_{\odot }$
, a low rotational velocity (
$v\, \sin \, i$
= 2.35 ± 0.24 km s
−1
) and metallicity of [Fe/H] = +0.23 ± 0.09. Finally, we discuss the possibility that TYC 8327-1678-1 became a lithium-rich star after a merging event involving a red giant and a helium white dwarf.
更多查看译文
关键词
stars: abundances,stars: chemically peculiar,stars: fundamental parameters,stars: individual: TYC 8327-1678-1
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要