论文标题
来自OB2恒星的星系旋转参数具有适当的动作和GAIA EDR3目录的视差
Galaxy Rotation Parameters from OB2 Stars with Proper Motions and Parallaxes from the Gaia EDR3 Catalog
论文作者
论文摘要
我们已经通过Xu等人选择的适当运动和视差分析了OB2恒星的运动学。来自Gaia EDR3目录。该样品中所有恒星的相对视差错误不超过10 \％。基于9750星的样品，获得了组速度成分$（u，v，w）_ \ odot =（7.21,7.46,8.52）\ pm（0.13,0.20,0.10.10）$〜km/s，获得了旋转角度旋转的参数 美元 $ω^{''} _ 0 = 0.674 \ pm0.009 $〜km/s/s/kpc $^{3} $。太阳中心周围的太阳能社区旋转的圆速度为$ v_0 = 240.7 \ pm3.0 $〜km/s，对于太阳的假定距离到银河中心$ r_0 = 8.1 \ pm0.1 $ 〜kpc。结果表明，具有$Δπ= -0.040 $ 〜MAS的GAIA EDR3目录的系统校正对三角差异的影响不超过该模型基础运动参数的$ \sim1σ$级别。基于OB恒星的适当运动，发现了剩余速度的以下差异：$（σ_1，σ_2，σ_3）=（11.79,9.66,7.21）\ pm（0.06,0.05,0.04）$〜km/s。结果表明，该椭圆形的第一轴略微从方向到银河系中心$ l_1 = 12.4 \ pm0.1^\ circ $，第三轴几乎完全定向了银河的北极，$ b_3 = 87.7.7.7 \ pm0.1 \ pm0.1^\ $ $。
We have analyzed the kinematics of OB2 stars with proper motions and parallaxes selected by Xu et al. from the Gaia EDR3 catalog. The relative parallax errors for all the stars in this sample do not exceed 10\%. Based on a sample of 9750 stars, the group velocity components $(U,V,W)_\odot=(7.21,7.46,8.52)\pm(0.13,0.20,0.10)$~km/s were obtained and the parameters of the angular velocity of rotation of the Galaxy: $Ω_0 =29.712\pm0.062$~km/s/kpc, $Ω^{'}_0=-4.014\pm0.018$~km/s/kpc$^{2}$ and $Ω^{''}_0=0.674\pm0.009$~km/s/kpc$^{3}$. The circular velocity of rotation of the solar neighborhood around the center of the Galaxy is $V_0=240.7\pm3.0$~km/s for the assumed distance of the Sun to the galactic center $R_0=8.1\pm0.1$~kpc. It is shown that the influence of the systematic correction to the trigonometric parallaxes of the Gaia EDR3 catalog with the value $Δπ=-0.040$~mas does not exceed the $\sim1σ$ level of the errors of the sought-for kinematic parameters of the model. Based on the proper motions of OB stars, the following variances of the residual velocities were found: $(σ_1,σ_2,σ_3)=(11.79,9.66,7.21)\pm(0.06,0.05,0.04)$~km/s. It is shown that the first axis of this ellipsoid slightly deviates from the direction to the center of the Galaxy $L_1=12.4\pm0.1^\circ$, and the third axis is oriented almost exactly to the north pole of the Galaxy, $B_3=87.7\pm0.1^\circ.$
