VLBI astrometry of radio stars to link radio and optical celestial reference frames - II. 11 radio stars
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2025
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| author | Zhang, Jingdong Zhang, Bo Xu, Shuangjing Mai, Xiaofeng Reid, Mark J. Jiang, Pengfei Chen, Wen Shu, Fengchun Li, Jinling Cui, Lang Zheng, Xingwu Sun, Yan Qi, Zhaoxiang |
| author_facet | Zhang, Jingdong Zhang, Bo Xu, Shuangjing Mai, Xiaofeng Reid, Mark J. Jiang, Pengfei Chen, Wen Shu, Fengchun Li, Jinling Cui, Lang Zheng, Xingwu Sun, Yan Qi, Zhaoxiang |
| contents | The alignment between the radio-based International Celestial Reference Frame (ICRF) and the optical Gaia Celestial Reference Frame (Gaia-CRF) is critical for multi-waveband astronomy, yet systematic offsets at the optical bright end (G<13) limit their consistency. While radio stars offer a potential link between these frames, their utility has been restricted by the scarcity of precise Very Long Baseline Interferometry (VLBI) astrometry. In this study, we present new VLBI astrometry of 11 radio stars using the Very Long Baseline Array (VLBA), expanding the existing sample with positions, parallaxes, and proper motions measured. All 11 radio stars were detected, for 10 of which parallaxes and proper motions can be estimated, achieving median uncertainties better than 0.1 mas and 0.1 mas/yr, respectively. These new samples greatly contribute to the link between ICRF and Gaia-CRF at the optical bright end. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_13136 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | VLBI astrometry of radio stars to link radio and optical celestial reference frames - II. 11 radio stars Zhang, Jingdong Zhang, Bo Xu, Shuangjing Mai, Xiaofeng Reid, Mark J. Jiang, Pengfei Chen, Wen Shu, Fengchun Li, Jinling Cui, Lang Zheng, Xingwu Sun, Yan Qi, Zhaoxiang Solar and Stellar Astrophysics Astrophysics of Galaxies Instrumentation and Methods for Astrophysics The alignment between the radio-based International Celestial Reference Frame (ICRF) and the optical Gaia Celestial Reference Frame (Gaia-CRF) is critical for multi-waveband astronomy, yet systematic offsets at the optical bright end (G<13) limit their consistency. While radio stars offer a potential link between these frames, their utility has been restricted by the scarcity of precise Very Long Baseline Interferometry (VLBI) astrometry. In this study, we present new VLBI astrometry of 11 radio stars using the Very Long Baseline Array (VLBA), expanding the existing sample with positions, parallaxes, and proper motions measured. All 11 radio stars were detected, for 10 of which parallaxes and proper motions can be estimated, achieving median uncertainties better than 0.1 mas and 0.1 mas/yr, respectively. These new samples greatly contribute to the link between ICRF and Gaia-CRF at the optical bright end. |
| title | VLBI astrometry of radio stars to link radio and optical celestial reference frames - II. 11 radio stars |
| topic | Solar and Stellar Astrophysics Astrophysics of Galaxies Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2512.13136 |