HIGH-RESOLUTION VLBA OBSERVATIONS OF THREE 7 mm SiO MASERS TOWARD VX Sgr AT FIVE EPOCHS
文献类型：期刊论文
| 作者 | Su, J. B.1,2,3; Shen, Z. -Q.1,2; Chen, X.1,2; Yi, Jiyune4; Jiang, D. R.1,2; Yun, Y. J.5 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2012-07-20 |
| 卷号 | 754期号:1 |
| 关键词 | masers stars: individual (VX Sgr) supergiants techniques: interferometric |
| ISSN号 | 0004-637X |
| 通讯作者 | Su,JB |
| 英文摘要 | VX Sgr is a red supergiant at an adopted distance of 1.6 kpc with intense 43 GHz SiO maser emission. In this paper, we present the high-resolution very long baseline interferometry (VLBI) observations of SiO masers toward VX Sgr at five epochs. We used the Very Long Baseline Array to map the J = 1 -> 0 (upsilon = 1, 2) (SiO)-Si-28 masers and confirmed a ring-like structure. In the first two epochs, the upsilon = 1 masers form a ring, but upsilon = 2 maser spots residing only in the southern and northern regions do not form a complete ring. In the third epoch, the two masers are distributed in a ring structure and the upsilon = 2 masers are a bit closer to the central star. In the last two epochs, many new maser spots appear and overlap each other. These overlapping maser spots can be related to the shock waves and reflect the collisional pumping. We compare the observations with the pumping models and speculate that the real pumping mechanism may be complex in VX Sgr and vary with time. The J = 1 -> 0 (upsilon = 0) (SiO)-Si-29 line emission is also detected, but is too weak to produce any VLBI map. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | EVOLVED STARS ; TX CAM ; 43 GHZ ; SAGITTARII ; VARIABILITY ; EMISSION ; V=1 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000306111800047 |
| 公开日期 | 2014-05-15 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/10091]  |
| 专题 | 紫金山天文台_期刊（老文献） |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing, Jiangsu, Peoples R China 3.Chinese Acad Sci, Grad Sch, Beijing 100034, Peoples R China 4.Korea Astron & Space Sci Inst, Taejon 305348, South Korea 5.Seoul Natl Univ, Dept Phys & Astron, Seoul, South Korea |
| 推荐引用方式 GB/T 7714 | Su, J. B.,Shen, Z. -Q.,Chen, X.,et al. HIGH-RESOLUTION VLBA OBSERVATIONS OF THREE 7 mm SiO MASERS TOWARD VX Sgr AT FIVE EPOCHS[J]. ASTROPHYSICAL JOURNAL,2012,754(1). |
| APA | Su, J. B.,Shen, Z. -Q.,Chen, X.,Yi, Jiyune,Jiang, D. R.,&Yun, Y. J..(2012).HIGH-RESOLUTION VLBA OBSERVATIONS OF THREE 7 mm SiO MASERS TOWARD VX Sgr AT FIVE EPOCHS.ASTROPHYSICAL JOURNAL,754(1). |
| MLA | Su, J. B.,et al."HIGH-RESOLUTION VLBA OBSERVATIONS OF THREE 7 mm SiO MASERS TOWARD VX Sgr AT FIVE EPOCHS".ASTROPHYSICAL JOURNAL 754.1(2012). |
入库方式： OAI收割
来源：紫金山天文台
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