MONITORING OBSERVATIONS OF H2O AND SiO MASERS TOWARD POST-AGB STARS
文献类型：期刊论文
| 作者 | Kim, Jaeheon1; Cho, Se-Hyung2; Yoon, Dong-Hwan2,3 |
| 刊名 | JOURNAL OF THE KOREAN ASTRONOMICAL SOCIETY
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| 出版日期 | 2016-12-31 |
| 卷号 | 49期号:6页码:261-288 |
| ISSN号 | 1225-4614 |
| 关键词 | Circumstellar Matter Masers Radio Lines : Stars Stars : Post-agb |
| DOI | 10.5303/JKAS.2016.49.6.261 |
| 英文摘要 | We present the results of simultaneous monitoring observations of H2O 6(1,6)-5(2,3) (22 GHz) and SiO J=1-0, 2-1, 3-2 maser lines (43, 86, 129 GHz) toward five post-AGB (candidate) stars, using the 21-m single-dish telescopes of the Korean VLBI Network. Depending on the target objects, 7-11 epochs of data were obtained. We detected both H2O and SiO maser lines from four sources: OH16.1-0.3, OH38.10-0.13, OH65.5+1.3, and IRAS 19312+1950. We could not detect H2O maser emission toward OH13.1+5.1 between the late OH/IR and post-AGB stage. The detected H2O masers show typical double peaked line profiles. The SiO masers from four sources, except IRAS 19312+1950, show the peaks around the stellar velocity as a single peak, whereas the SiO masers from IRAS 19312+1950 occur above the red peak of the H2O maser. We analyzed the properties of detected maser lines, and investigated their evolutionary state through comparison with the full widths at zero power. The distribution of observed target sources was also investigated in the IRAS two-color diagram in relation with the evolutionary stage of post-AGB stars. From our analyses, the evolutionary sequence of observed sources is suggested as OH65.5+1.3 -> OH13.1+5.1 -> OH16.1-0.3 -> OH38.10-0.13, except for IRAS 19312+1950. In addition, OH13.1+5.1 from which the H2O maser has not been detected is suggested to be on the gateway toward the post-AGB stage. With respect to the enigmatic object, IRAS 19312+1950, we could not clearly figure out its nature. To properly explain the unusual phenomena of SiO and H2O masers, it is essential to establish the relative locations and spatial distributions of two masers using VLBI technique. We also include the 1.2 160 pm spectral energy distribution using photometric data from the following surveys: 2MASS, WISE, MSX, IRAS, and AKARI (IRC and FIS). In addition, from the IRAS LRS spectra, we found that the depth of silicate absorption features shows significant variations depending on the evolutionary sequence, associated with the termination of AGB phase mass-loss. |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | KOREAN ASTRONOMICAL SOCIETY |
| WOS记录号 | WOS:000391346400004 |
| 源URL | [http://119.78.226.72/handle/331011/32663]  |
| 专题 | 中国科学院上海天文台 |
| 通讯作者 | Kim, Jaeheon |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Korea Astron & Space Sci Inst, 776 Daedeokdae Ro, Daejeon 34055, South Korea 3.Seoul Natl Univ, 1 Gwanak Ro, Seoul 08826, South Korea |
| 推荐引用方式 GB/T 7714 | Kim, Jaeheon,Cho, Se-Hyung,Yoon, Dong-Hwan. MONITORING OBSERVATIONS OF H2O AND SiO MASERS TOWARD POST-AGB STARS[J]. JOURNAL OF THE KOREAN ASTRONOMICAL SOCIETY,2016,49(6):261-288. |
| APA | Kim, Jaeheon,Cho, Se-Hyung,&Yoon, Dong-Hwan.(2016).MONITORING OBSERVATIONS OF H2O AND SiO MASERS TOWARD POST-AGB STARS.JOURNAL OF THE KOREAN ASTRONOMICAL SOCIETY,49(6),261-288. |
| MLA | Kim, Jaeheon,et al."MONITORING OBSERVATIONS OF H2O AND SiO MASERS TOWARD POST-AGB STARS".JOURNAL OF THE KOREAN ASTRONOMICAL SOCIETY 49.6(2016):261-288. |
入库方式： OAI收割
来源：上海天文台
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