A VLBA Trigonometric Parallax for RR Aql and the Mira PL Relation

@inproceedings{Sun2022AVT,
  title={A VLBA Trigonometric Parallax for RR Aql and the Mira PL Relation},
  author={Yan-Guo Sun and Bo Zhang and Mark J. Reid and Shuangjing Xu and Shiming Wen and Jingdong Zhang and Xing-wu Zheng},
  year={2022}
}
We report VLBA observations of 22 GHz H 2 O and 43 GHz SiO masers toward the Mira variable RR Aql. By fitting the SiO maser emission to a circular ring, we estimate the absolute stellar position of RR Aql and find agreement with Gaia astrometry to within the joint uncertainty of ≈ 1 mas. Using the maser astrometry we measure a stellar parallax of 2.44 ± 0.07 mas, corresponding to a distance of 410 +12 − 11 pc. The maser parallax deviates significantly from the Gaia EDR3 parallax of 1.95 ± 0.11 mas… 

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