Seimei/KOOLS-IFU mapping of the gas and dust distributions in Galactic PNe: Unveiling the origin and evolution of the Galactic halo PN H4-1

IF 2.2 4区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS Publications of the Astronomical Society of Japan Pub Date : 2023-10-27 DOI:10.1093/pasj/psad069
Masaaki Otsuka, Toshiya Ueta, Akito Tajitsu
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Abstract

Abstract H4-1 is a planetary nebula (PN) located in the Galactic halo, and is notably carbon-rich and one of the most metal-deficient PNe in the Milky Way. To unveil its progenitor evolution through accurate measurement of the gas mass, we conducted a comprehensive investigation of H4-1, using the newly obtained Seimei/KOOLS-IFU spectra and multiwavelength spectro-photometry data. The emission-line images generated from the KOOLS-IFU data cube successfully resolve the ellipsoidal nebula and the equatorial flattened disk that are frequently seen in bipolar PNe evolved from massive progenitors. By a fully data-driven method, we directly derived the seven elemental abundances, the gas-to-dust mass ratio, and the gas and dust masses based on our own distance scale. By comparing the observed quantities with both the photoionization model and the binary nucleosynthesis model, we conclude that the progenitors of initial masses of 1.87 M$_{\odot }$ and 0.82 M$_{\odot }$ are second-generation stars formed ∼4 Gyr after the Big Bang that have undergone mass transfers and a binary merger, and have ultimately evolved into a PN showing unique chemical abundances. Our binary model successfully reproduces the observed abundances and also explains the evolutionary time scale of H4-1.
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PNe星系气体和尘埃分布的晴明/KOOLS-IFU地图:揭示星系晕PN H4-1的起源和演化
H4-1是一个位于银河系晕中的行星状星云(PN),是银河系中最富碳和最缺金属的行星状星云之一。为了通过精确测量气体质量来揭示其祖先的演化,我们利用新获得的Seimei/KOOLS-IFU光谱和多波长分光光度法数据对H4-1进行了全面的研究。由KOOLS-IFU数据立方体生成的发射在线图像成功地分辨出了在双极海王星中常见的椭球状星云和赤道扁平盘,它们是由大质量祖先演化而来的。通过完全数据驱动的方法,我们直接推导出了7种元素的丰度,气体与尘埃的质量比,以及基于我们自己的距离尺度的气体和尘埃质量。通过与光离模型和双星核合成模型的比较,我们得出结论,初始质量为1.87 M$_{\odot}$和0.82 M$_{\odot}$的祖星是在大爆炸后约4 Gyr形成的第二代恒星,它们经历了质量传递和双星合并,并最终进化成具有独特化学丰度的PN。我们的二元模型成功地再现了观测到的丰度,并解释了H4-1的演化时间尺度。
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来源期刊
Publications of the Astronomical Society of Japan
Publications of the Astronomical Society of Japan 地学天文-天文与天体物理
CiteScore
4.10
自引率
13.00%
发文量
98
审稿时长
4-8 weeks
期刊介绍: Publications of the Astronomical Society of Japan (PASJ) publishes the results of original research in all aspects of astronomy, astrophysics, and fields closely related to them.
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