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カワキタ ヒデヨ
KAWAKITA HIDEYO
河北 秀世 所属 京都産業大学 理学部 宇宙物理・気象学科 職種 教授 |
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| 発行・発表の年月 | 2024/04 |
| 形態種別 | 研究論文 |
| 標題 | [N i] 10400/10410 Å Lines as Possible Disk Wind Tracers in a Young Intermediate-mass Star |
| 執筆形態 | その他 |
| 掲載誌名 | The Astrophysical Journal |
| 出版社・発行元 | American Astronomical Society |
| 巻・号・頁 | 965(1),70-70頁 |
| 著者・共著者 | Haruki Katoh,Chikako Yasui,Yuji Ikeda,Naoto Kobayashi,Noriyuki Matsunaga,Sohei Kondo,Hiroaki Sameshima,Satoshi Hamano,Misaki Mizumoto,Hideyo Kawakita,Kei Fukue,Shogo Otsubo,Keiichi Takenaka |
| 概要 | Abstract
In this study, we performed high-resolution near-infrared (NIR) spectroscopy (R = 28,000; λ = 0.90–1.35 μm) with a high signal-to-noise ratio on HD 200775, a very young (∼0.1 Myr old) and massive intermediate-mass star (a binary star with a mass of about 10 M⊙ each) with a protoplanetary disk. The obtained spectra show eight forbidden lines of three elements: two of [S ii] (10289 and 10323 Å), two of [N i] (10400 and 10410 Å), and four of [Fe ii] (12570, 12946, 12981, and 13209 Å). This is the first time that the [N i] lines are detected in a young stellar object with a doublet deblended. Gaussian fitting of the spectra indicates that all line profiles have low-velocity components and exhibit blueshifted features, suggesting that all lines originate from the disk winds (magnetohydrodynamic disk wind and/or photoevaporative wind). Based on the fit, the [N i] and [Fe ii] lines are categorized into narrow components, while the [S ii] lines are at the boundary between broad and narrow components. These forbidden lines are suggested to be very promising disk wind tracers among the existing ones because they are in the NIR-wavelength range, which can be observed from early stages with high sensitivities. Among these lines, [N i] lines would be a rather powerful probe for deriving the basic physical parameters of disk wind gases. However, the study of these lines herein is limited to one object; thus, further studies are needed to examine their properties. |
| DOI | 10.3847/1538-4357/ad2842 |
| ISSN | 0004-637X/1538-4357 |
| PermalinkURL | https://iopscience.iop.org/article/10.3847/1538-4357/ad2842 |
| researchmap用URL | https://iopscience.iop.org/article/10.3847/1538-4357/ad2842/pdf |