Detection of zinc in the very metal-poor post-AGB star HR 4049

Yoichi Takeda, Mudumba Parthasarathy, Wako Aoki, Yoshifusa Ita, Yoshikazu Nakada, Hideyuki Izumiura, Kunio Noguchi, Masahide Takada-Hidai, Bun'ei Sato, Akito Tajitsu, Satoshi Honda, Satoshi Kawanomoto, Hiroyasu Ando, Hiroshi Karoji

研究成果: Article査読

10 被引用数 (Scopus)

抄録

We report on the detection of two Zn I lines at 4722.15 Å and 4810.53 Å in the high-quality spectrum of the very metal-poor post-AGB star HR 4049, which was obtained with the High Dispersion Spectrograph attached to the Subaru Telescope. The strengths of these lines indicate an appreciable underabundance of Zn by ∼ -1.3 dex relative to the Sun. The fact that this volatile element, similarly to others belonging to the same group (e.g., C, N, O, S), does not conform to the extreme depletion (> 4dex) of refractory metals (e.g., Fe), strongly suggests that grain formation has something to do with the origin of the chemical peculiarity. This (not extremely but significantly) subsolar value of [Zn/H] is quantitatively discussed in connection with those of other volatile species, especially with respect to S. We also detected a new Fe II line at 5159.03 Å along with the already known Fe II 4923.93 Å line; based on these two lines the Fe abundance of HR 4049 is determined to be ∼ 2.8 ([Fe/H] ∼ -4.7).

本文言語English
ページ(範囲)765-773
ページ数9
ジャーナルPublications of the Astronomical Society of Japan
54
5
DOI
出版ステータスPublished - 2002
外部発表はい

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学

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