DISTANCE AND KINEMATICS OF THE RED HYPERGIANT VY CMa: VERY LONG BASELINE ARRAY AND VERY LARGE ARRAY ASTROMETRY
文献类型：期刊论文
| 作者 | Zhang, B.1,3 ; Reid, M. J.2; Menten, K. M.3; Zheng, X. W.4
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2012 |
| 卷号 | 744期号:1页码:1 |
| 关键词 | astrometry masers parallaxes proper motions stars: individual (VY CMa) supergiants |
| 英文摘要 | We report astrometric results of phase-referencing very long baseline interferometry observations of 43 GHz SiO maser emission toward the red hypergiant VY Canis Majoris (VY CMa) using the Very Long Baseline Array (VLBA). We measured a trigonometric parallax of 0.83 +/- 0.08 mas, corresponding to a distance of 1.20(-0.10)(+0.13) kpc. Compared to previous studies, the spatial distribution of SiO masers has changed dramatically, while its total extent remains similar. The internal motions of the maser spots are up to 1.4 mas yr(-1), corresponding to 8 km s(-1), and show a tendency for expansion. After modeling the expansion of maser spots, we derived an absolute proper motion for the central star of mu(x) =-2.8 +/- 0.2 and mu(y) = 2.6 +/- 0.2 mas yr(-1) eastward and northward, respectively. Based on the maser distribution from the VLBA observations, and the relative position between the radio photosphere and the SiO maser emission at 43 GHz from the complementary Very Large Array observations, we estimate the absolute position of VY CMa at mean epoch 2006.53 to be alpha(J2000) = 07(h)22(m)58.(s)3259 +/- 0.(s)0007, delta(J2000) =-25 degrees 46'03.''063 +/- 0.''010. The position and proper motion of VY CMa from the VLBA observations differ significantly with values measured by the Hipparcos satellite. These discrepancies are most likely associated with inhomogeneities and dust scattering the optical light in the circumstellar envelope. The absolute proper motion measured with VLBA suggests that VY CMa may be drifting out of the giant molecular cloud to the east of it. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | SIO MASER EMISSION ; HUBBLE-SPACE-TELESCOPE ; VLBA CALIBRATOR SURVEY ; CANIS-MAJORIS ; RADIO PHOTOSPHERES ; STELLAR EVOLUTION ; VARIABLE-STARS ; EVOLVED STARS ; NML-CYGNI ; ROTATION |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000298408300023 |
| 源URL | [http://119.78.226.72/handle/331011/18127]  |
| 专题 | 上海天文台_VLBI研究室 |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA 3.Max Planck Inst Radioastron, D-53121 Bonn, Germany 4.Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, B.,Reid, M. J.,Menten, K. M.,et al. DISTANCE AND KINEMATICS OF THE RED HYPERGIANT VY CMa: VERY LONG BASELINE ARRAY AND VERY LARGE ARRAY ASTROMETRY[J]. ASTROPHYSICAL JOURNAL,2012,744(1):1. |
| APA | Zhang, B.,Reid, M. J.,Menten, K. M.,&Zheng, X. W..(2012).DISTANCE AND KINEMATICS OF THE RED HYPERGIANT VY CMa: VERY LONG BASELINE ARRAY AND VERY LARGE ARRAY ASTROMETRY.ASTROPHYSICAL JOURNAL,744(1),1. |
| MLA | Zhang, B.,et al."DISTANCE AND KINEMATICS OF THE RED HYPERGIANT VY CMa: VERY LONG BASELINE ARRAY AND VERY LARGE ARRAY ASTROMETRY".ASTROPHYSICAL JOURNAL 744.1(2012):1. |
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来源：上海天文台
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