DOI

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 12C/13C 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 A and the subordinate line at 6104 A that yielding a mean value of log e (Li)_NLTE = 3.48. The projected rotational velocity (vsin 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+/- 0.20 Msun, a low rotational velocity (vsin 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.
Переведенное названиеTYC 8327-1678-1: новый гигант со сверхвысоким содержанием лития
Язык оригиналаанглийский
Страницы (с-по)77-83
Число страниц7
ЖурналMonthly Notices of the Royal Astronomical Society
Том498
Номер выпуска1
DOI
СостояниеОпубликовано - 1 окт 2020

    Области исследований

  • stars: abundances, stars: chemically peculiar, stars: fundamental parameters, stars: individual: TYC 8327-1678-1

    Предметные области Scopus

  • Астрономия и астрофизика
  • Космические науки и планетоведение

ID: 75626617