The Nearby Evolved Stars Survey - IV. Mapping cold gas in the circumstellar envelopes of evolved stars with 12CO and 13CO (J = 1 → 0) emission
文献类型：期刊论文
| 作者 | Amada, K.2; Fukaya, S.3; Imai, H.3,4; Scicluna, P.5,6; Hirano, N.7; Trejo-Cruz, A.7,8; Zeegers, S.9,10; Kemper, F.11,12,13; He JH(何金华)14,15,16; Srinivasan, S.8 |
| 刊名 | Monthly Notices of the Royal Astronomical Society
 |
| 出版日期 | 2026-04-01 |
| 卷号 | 547期号:2 |
| 关键词 | stars: AGB and post-AGB stars: mass-loss stars: winds, outflows |
| ISSN号 | 0035-8711 |
| DOI | 10.1093/mnras/staf2239 |
| 产权排序 | 第13完成单位 |
| 文献子类 | Journal article (JA) - |
| 英文摘要 | We have performed mapping observations of 42 AGB stars, of which 23 and 14 stars were detected in 12CO and 13CO (J = 1 → 0) emission, respectively, using 45 m telescope of Nobeyama Radio Observatory. Our aim is to reveal distributions of extended cold gas in circumstellar envelopes and test a possibility of detecting shell structures with high 12CO/13CO ratios caused by thermal pulses and third dredge-ups. By comparing our maps with those of 12CO (J = 3 → 2) emission obtained with James Clerk Maxwell Telescope at the same angular resolution, we found that envelopes of 12CO ( J = 1 → 0) emission has at least twice the sizes of 12CO ( J = 3 → 2) emission. Among 14 stars detected in both 12CO and 13CO emission, nine stars show radial variations of 12CO/13CO ratio along radial direction in their envelopes, which is likely caused by selective photodissociation by interstellar ultraviolet radiation, not thermal pulses or third dredge ups. Based on radiative transfer simulations, we conclude that optical depths are small (typically τ ≤ 0.5), ruling out the possibility that the absence of detected shells in our data is due to optical depth. This implies no signatures of thermal pulses or third dredge ups in the last ∼1500-13 000 yr. We further confirmed aspherical envelope morphologies of o Cet, WX Psc, and RAFGL 618, which were likely formed by bipolar outflows and photodissociation. The elongated morphology of SV Peg that we newly found is subject to study. © 2025 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. |
| 学科主题 | 天文学 ; 恒星与银河系 |
| URL标识 | 查看原文 |
| 出版地 | GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND |
| WOS关键词 | ASYMPTOTIC GIANT BRANCH ; BRIGHT CARBON STARS ; MASS-LOSS ; AGB STARS ; FUNDAMENTAL PARAMETERS ; INFRARED EXCESSES ; DETACHED SHELLS ; EVOLUTION ; PROTOPLANETARY ; MILLIMETER |
| 资助项目 | Amanogawa Galaxy Astronomy Research Center (AGARC), Kagoshima University; Japan Society for the Promotion of Science (JSPS) Fellowship for Young Researchers[23KJ1777]; JSPS KAKENHI[JP 16H02167]; NSFC[11873086]; Research Foundation Flanders (FWO)[1285221N]; Chinese Academy of Sciences (CAS); Spanish programme Unidad de Excelencia Marimath;a de Maeztu - MCIN/AEI[CEX2020-001058-M]; National Science and Technology Council of Taiwan[NSTC 112-2112-M-001-032-MY3]; Korean government (MSIT)[2025184102]; Korean government (MSIT)[RS-2021-NR058398]; UNAM-PAPIIT programme[IA104824]; UK Science and Technology Facilities Council[ST/P000649/1]; Spanish Ministry of Science, Innovation and Universities[PID2023-149918NB-I00] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001707137100001 |
| 出版者 | OXFORD UNIV PRESS |
| 资助机构 | Amanogawa Galaxy Astronomy Research Center (AGARC), Kagoshima University ; Japan Society for the Promotion of Science (JSPS) Fellowship for Young Researchers[23KJ1777] ; JSPS KAKENHI[JP 16H02167] ; NSFC[11873086] ; Research Foundation Flanders (FWO)[1285221N] ; Chinese Academy of Sciences (CAS) ; Spanish programme Unidad de Excelencia Marimath ; a de Maeztu - MCIN/AEI[CEX2020-001058-M] ; National Science and Technology Council of Taiwan[NSTC 112-2112-M-001-032-MY3] ; Korean government (MSIT)[2025184102, RS-2021-NR058398] ; UNAM-PAPIIT programme[IA104824] ; UK Science and Technology Facilities Council[ST/P000649/1] ; Spanish Ministry of Science, Innovation and Universities[PID2023-149918NB-I00] |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/29035]  |
| 专题 | 云南天文台_其他 |
| 通讯作者 | Amada, K. |
| 作者单位 | 1.UK Astronomy Technology Centre, Royal Observatory, Blackford Hill, Edinburgh, EH9 3HJ, United Kingdom; 2.Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588, Japan; 3.Graduate School of Science and Engineering, Kagoshima University, 1-21-35 Korimoto, Kagoshima, 890-0065, Japan; 4.Center for General Education, Institute for Comprehensive Education, Kagoshima University, 1-21-30 Korimoto, Kagoshima, 890-0065, Japan; 5.Centre for Astrophysics Research, Department of Physics, Astronomy and Mathematics, College Lane Campus, University of Hertfordshire, Hatfield, AL10 9AB, United Kingdom; 6.Space Science Institute, 4750 Walnut Street, Suite 205, Boulder, CO, 80301, United States; 7.Institute of Astronomy and Astrophysics, Academia Sinica, 11F of AS/NTU Astronomy-Mathematics Building, No.1, Sec. 4, Roosevelt Rd, Taipei, 106319, Taiwan; 8.Instituto de Radioastronomía y Astrofísica, UNAM, Antigua Carretera a Pátzcuaro 8701, Ex-Hda. San José de la Huerta, Mich., Morelia, 58089, Mexico; 9.European Space Agency (ESA), European Space Research and Technology Centre (ESTEC), Keplerlaan 1, Noordwijk, NL-2201 AZ, Netherlands; 10.SRON Space Research Organisation Netherlands, Niels Bohrweg 4, Leiden, NL-2333 CA, Netherlands; |
| 推荐引用方式 GB/T 7714 | Amada, K.,Fukaya, S.,Imai, H.,et al. The Nearby Evolved Stars Survey - IV. Mapping cold gas in the circumstellar envelopes of evolved stars with 12CO and 13CO (J = 1 → 0) emission[J]. Monthly Notices of the Royal Astronomical Society,2026,547(2). |
| APA | Amada, K..,Fukaya, S..,Imai, H..,Scicluna, P..,Hirano, N..,...&Shinnaga, H..(2026).The Nearby Evolved Stars Survey - IV. Mapping cold gas in the circumstellar envelopes of evolved stars with 12CO and 13CO (J = 1 → 0) emission.Monthly Notices of the Royal Astronomical Society,547(2). |
| MLA | Amada, K.,et al."The Nearby Evolved Stars Survey - IV. Mapping cold gas in the circumstellar envelopes of evolved stars with 12CO and 13CO (J = 1 → 0) emission".Monthly Notices of the Royal Astronomical Society 547.2(2026). |
入库方式： OAI收割
来源：云南天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。