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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >VLBI Astrometry of AGB Variables with VERA - A Semiregular Variable S Crateris -
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VLBI Astrometry of AGB Variables with VERA - A Semiregular Variable S Crateris -

机译：带有VERA的AGB变量的VLBI占星术-半规则变量S Crateris-

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摘要

We present a distance measurement for the semiregular variable S Crateris (S Crt) based on its annual parallax. With the unique dual beam system of the VLBI Exploration for Radio Astrometry (VERA) telescopes, we measured the absolute proper motion of a water maser spot associated with S Crt, referred to the quasar J1147-0724 located at an angular separation of 1°23. In observations spanning nearly two years, we detected the maser spot at an LSR velocity of 34.7 km s~(-1), for which we measured an annual parallax of 2.33 ± 0.13 mas, corresponding to a distance of 430_(-23)~(+25)(pc. This measurement has an accuracy one order of magnitude better than the parallax measurements of HIPPARCOS. The angular distribution and three-dimensional velocity field of maser spots indicate a bipolar outflow with the flow axis along the northeast-southwest direction. Using the distance and photospheric temperature, we estimated the stellar radius of S Crt and compared it with those of Mira variables.
机译：我们基于半视变量S Crateris（S Crt）的年度视差提出距离测量。利用VLBI射电占星术（VERA）望远镜的独特双光束系统，我们测量了与S Crt相关的水脉斑的绝对正确运动，这是指位于1°23角间隔的类星体J1147-0724 。在近两年的观测中，我们以34.7 km s〜（-1）的LSR速度检测到maser点，为此我们测得的年视差为2.33±0.13 mas，对应于430 _（-23）〜的距离（+25）（pc。这种测量的精度比HIPPARCOS的视差测量高一个数量级。maser点的角分布和三维速度场表示双极性流出，流轴沿东北-西南方向使用距离和光球温度，我们估算了S Crt的恒星半径，并将其与Mira变量的恒星半径进行了比较。

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