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Galactic Rotation Parameters Based on Stars from Active Star-Forming Regions with Data from the Gaia DR2 Catalogue
Astronomy Letters ( IF 1.1 ) Pub Date : 2020-10-22 , DOI: 10.1134/s1063773720060067
O. I. Krisanova , V. V. Bobylev , A. T. Bajkova

Abstract

We have studied a sample of more than 25 000 young stars with proper motions and trigonometric parallaxes from the Gaia DR2 catalogue. The relative errors of their parallaxes do not exceed 10\(\%\). The selection of stars belonging to active star-forming regions was made by Marton et al. based on data from the Gaia DR2 catalogue by invoking infrared measurements from the WISE and Planck catalogues. Low-mass T Tauri stars constitute the majority of sample stars. The following parameters of the angular velocity of Galactic rotation have been found from them: \(\Omega_{0}=28.40\pm 0.11\) km s\({}^{-1}\) kpc\({}^{-1}\), \(\Omega^{\prime}_{0}=-3.933\pm 0.033\) km s\({}^{-1}\) kpc\({}^{-2}\), and \(\Omega^{\prime\prime}_{0}=0.804\pm 0.040\) km s\({}^{-1}\) kpc\({}^{-3}\). The Oort constants are \(A=15.73\pm 0.32\) km s\({}^{-1}\) kpc\({}^{-1}\) and \(B=-12.67\pm 0.34\) km s\({}^{-1}\) kpc\({}^{-1}\), while the circular rotation velocity of the solar neighborhood around the Galactic center is \(V_{0}=227\pm 4\) km s\({}^{-1}\) for the adopted Galactocentric distance of the Sun \(R_{0}=8.0\pm 0.15\) kpc.



中文翻译:

星系自转参数基于Gaia DR2目录中来自活动恒星形成区恒星的数据

摘要

我们研究了Gaia DR2目录中超过25 000颗具有适当运动和三角视差的年轻恒星的样本。其视差的相对误差不超过10 \(\%\)。属于活跃恒星形成区域的恒星的选择是由Marton等人进行的。通过调用WISE和Planck目录中的红外测量结果,基于Gaia DR2目录中的数据。低质量T Tauri恒星构成了大多数样本恒星。从中找到了以下银河系旋转角速度参数:\(\ Omega_ {0} = 28.40 \ pm 0.11 \) km s \({} ^ {-1} \) kpc \({} ^ { -1} \)\(\ Omega ^ {\ prime} _ {0} =-3.933 \ pm 0.033 \) km s \({} ^ {-1} \) kpc\({} ^ {-2} \)\(\ Omega ^ {\ prime \ prime} _ {0} = 0.804 \ pm 0.040 \) km s \({} ^ {-1} \) kpc \ ({} ^ {-3} \)。奥特常数为\(A = 15.73 \ pm 0.32 \) km s \({} ^ {-1} \) kpc \ {{} ^ {-1} \)\(B = -12.67 \ pm 0.34 \ ) km s \({} ^ {-1} \) kpc \ {{} ^ {-1} \),而银河系中心周围太阳附近的圆周旋转速度为\(V_ {0} = 227 \ pm 4 \) km s \({} ^ {-1} \)为采用的太阳的Galactocentric距离\(R_ {0} = 8.0 \ pm 0.15 \) kpc。

更新日期:2020-10-30
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