| Measuring the Distance of VX Sagittarii with SiO Maser Proper Motions |
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| 作者姓名： | Xi Chen Zhi-Qiang Shen Ye Xu |
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| 作者单位： | Xi Chen1，2，Zhi-Qiang Shen1 and Ye Xu1 1 Shanghai Astronomical Observatory，Chinese Academy of Sciences，Shanghai 200030; 2 Department of Earth Sciences，National Taiwan Normal University，88 Sec. 4，Ting-Chou Rd.，Taipei 116，Taiwan |
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| 摘 要： | We report on 43GHz v=1, J=1-0 SiO maser proper motions in the circumstellar envelope of the M-type semi-regular variable star VX Sgr, observed by Very Long Baseline Array (VLBA) at 3 epochs during 1999 April-May. Applying the statistical parallax analysis to these proper motions, we estimated a distance of VX Sgr of 1.57±0.27kpc, which is consistent with that based on the proper motions of H2O masers, or on the assumption that VX Sgr belongs to the Sgr OB1 association. At this distance, VX Sgr can be classified as a red supergiant. Comparing the statistical parallax method with those of model fitting and annual parallax, we think that the statistical parallax method may be a good way of estimating SiO maser distances at present.
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| 关 键 词： | methods: statistical — masers — stars: individual (VX Sgr) — stars: distances |
| 修稿时间： | 2006-12-12 |
Measuring the Distance of VX Sagittarii with SiO Maser Proper Motions |
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| Xi Chen Zhi-Qiang Shen Ye Xu.Measuring the Distance of VX Sagittarii with SiO Maser Proper Motions[J].Chinese Journal of Astronomy and Astrophysics,2007,7(4):531-538. |
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| Authors: | Xi Chen Zhi-Qiang Shen Ye Xu |
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| Abstract: | |
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| Keywords: | methods: statistical - masers -stars: individual (VX Sgr)- stars: distances |
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