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首页> 外文学位 >VLBI observations of the candidate guide stars and their reference sources for the spaceborne NASA/Stanford gyroscope relativity mission (Gravity Probe B).
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VLBI observations of the candidate guide stars and their reference sources for the spaceborne NASA/Stanford gyroscope relativity mission (Gravity Probe B).

机译：VLBI对星载NASA /斯坦福陀螺仪相对性任务（重力探测器B）的候选导星及其参考源的观测。

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摘要

The gyroscope relativity mission, Gravity Probe B (GP-B), is being developed by NASA and Stanford University to test two unverified predictions of general relativity through measurements of the precessions of gyroscopes placed in low-Earth orbit. For the measurement-accuracy goals of the mission to be met, the proper motion of a guide star, whose position provides a reference against which the precessions are measured, must be determined in an extragalactic reference frame with a standard error much less than 0.5 mas/yr. Very-Long-Baseline Interferometry (VLBI) is a technique that is capable of measuring the proper motions of stars at this level of accuracy. To minimize the uncertainty in the VLBI-determined position of the to-be-selected guide star, one must examine the structure of radio emissions of candidate stars and their corresponding extragalactic reference sources.;I present VLBI mapping results of the GP-B guide star candidate HR 5110 and its extragalactic reference sources J1328+363, J1334+371 and J1340+379, candidate HR 1099 and its extragalactic reference sources CTA 26 and J0331+022, and candidate HR 8703 and its extragalactic reference sources 3C454.3 and J2250+194. I analyze source structure revealed in maps and model fits, discuss the effect that complex or extended emission structure could have on the accuracy of the proper motion determinations for these stars, indicate how such effects could be partly corrected for and compare the stars as to their VLBI-related suitability for GP-B.
机译：美国国家航空航天局（NASA）和斯坦福大学（Stanford University）正在开发陀螺仪相对性任务“重力探测器B（GP-B）”，以通过测量放置在低地球轨道上的陀螺仪的进动来测试两种未经验证的广义相对论预测。为了达到任务的测量精度目标，必须在银河系参考系中确定导星的正确运动，其位置提供了进动量的测量参考，其标准误差远小于0.5 mas /年。超长基线干涉测量法（VLBI）是一种能够以这种精度水平测量恒星正确运动的技术。为了最大程度地减少待选指南星在VLBI确定位置上的不确定性，必须检查候选星及其相应的银河外参考源的无线电发射结构。我介绍了GP-B指南的VLBI映射结果星候选HR 5110及其银河外参考源J1328 + 363，J1334 + 371和J1340 + 379，候选HR 1099及其银河外参考源CTA 26和J0331 + 022，候选HR 8703及其银河外参考源3C454.3和J2250 +194。我分析了在地图和模型拟合中揭示的源结构，讨论了复杂或扩展的发射结构可能对这些恒星正确运动确定的准确性的影响，指出了如何对这些影响进行部分校正并比较恒星与其VLBI相关的GP-B适用性。

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  • 作者

    Ransom, Ryan R.;

  • 作者单位

    York University (Canada).;

  • 授予单位 York University (Canada).;
  • 学科 Physics Astronomy and Astrophysics.
  • 学位 M.Sc.
  • 年度 1998
  • 页码 152 p.
  • 总页数 152
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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