重新审视出生地点的人B1929 +10、B2020 +28和B2021 +51
Revisiting the birth locations of pulsars B1929+10, B2020+28,and B2021+51
摘要：
我们提出了新的自行和视差测量获得的欧洲VLBI网络（EVN）在5 $\,$ GHz的三个孤立的恒星B1929+10，B2020+28，和B2021+51。对于B1929+10，我们结合我们的数据与早期的VLBI测量，并确认该脉冲星的天体测量参数的鲁棒性。对于双星B2020+28和B2021+51，我们的观测表明，这两颗恒星距离太阳系的距离比以前认为的要近两倍，它们的距离分别为$1.39_{-0.06}^{+0.05}$和$1.25_{-0.17}^{+0.14}\,$ kpc。使用我们新的天体测量学，我们模拟了银河系中所有三颗恒星的轨道，目的是确认或拒绝先前提出的出生地点。我们的观测最终排除了B1929+10和位于上天蝎座的逃逸恒星$ζ$蛇夫座的双星起源。B2020+28和B2021+51共同起源于天鹅座超级气泡的可能性也很小。
英文摘要：
We present new proper motion and parallax measurements obtained with the European VLBI Network (EVN) at 5$\,$GHz for the three isolated pulsars B1929+10, B2020+28, and B2021+51. For B1929+10 we combined our data with earlier VLBI measurements and confirm the robustness of the astrometric parameters of this pulsar. For pulsars B2020+28 and B2021+51 our observations indicate that both stars are almost a factor of two closer to the solar system than previously thought, placing them at a distance of $1.39_{-0.06}^{+0.05}$ and $1.25_{-0.17}^{+0.14}\,$kpc. Using our new astrometry, we simulated the orbits of all three pulsars in the Galactic potential with the aim to confirm or reject previously proposed birth locations. Our observations ultimately rule out a claimed binary origin of B1929+10 and the runaway star $ζ$ Ophiuchi in Upper Scorpius. A putative common binary origin of B2020+28 and B2021+51 in the Cygnus Superbubble is also very unlikely.
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