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Accurate parallax measurement toward the symbiotic star R Aquarii

机译:对共生恒星R Aquarii的准确视差测量

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Multiepoch phase-referencing VLBI (Very Long Baseline Interferometry) observations with VERA (VLBI Exploration of Radio Astrometry) were performed for the symbiotic star R Aquarii (R Aqr) from 2005 September to 2006 October. Tracing one of the v = 2, J = 1–0 SiO maser spots, we measured an annual parallax of π = 4.59 ± 0.24 mas, corresponding to a distance of 218+12 ?11 pc. Our result is consistent with earlier distance measurements, but yields the highest accuracy of ~5% level. Applying our distance, we derived an absolute K-band magnitude of MK = ?7.71 ± 0.11, which is consistent with the recent period–luminosity relation by VLBI parallax measurements for five OH-Mira variables. In addition, the expansion age of an inner nebula around R Aqr is found to be ~240 yr, corresponding to about the year 1773.
机译:2005年9月至2006年10月,对共生恒星R Aquarii(R Aqr)进行了VERA(射电占星术的VLBI探索)的多纪相参考VLBI(甚长基线干涉法)观测。追踪v = 2,J = 1-0 SiO maser点之一,我们测得的年视差为π= 4.59±0.24 mas,对应于218 + 12?11 pc的距离。我们的结果与早期的距离测量结果是一致的,但是产生的精度最高为5%左右。应用我们的距离,我们得出了绝对的K波段幅度MK =?7.71±0.11,这与通过VLBI视差测量的五个OH-Mira变量的最近周期-发光度关系一致。另外,发现R Aqr附近的一个内部星云的膨胀年龄为〜240年,大约相当于1773年。

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