论文标题
通过Lamost调查对M33的光谱研究。 I.来自星云的化学梯度
Spectroscopic Study of M33 with LAMOST survey. I. Chemical gradients from nebulae
论文作者
论文摘要
通过Lamost DR7调查研究了M33的形态和化学结构。 M33中的110个星云（95 H \ II \区域和15个PNE）确定了HE，N，O，NE，S，Cl，AR的物理参数，灭绝，化学组成。其中，新发现的M33中的8个PNE和55 H \ II \地区是新发现的。 We obtained the following O abundance gradients: $-$0.199$_{-0.030}^{+0.030}$ dex $R_{25}^{-1}$ (based on 95 H\ii\ regions), $-$0.124$_{-0.036}^{+0.036}$ dex $ r_ {25}^{ - 1} $（基于93 h \ ii \区域）和$ - $ - $ 0.207 $ _ { - 0.174}^{+0.160} $ 0.160} $ dex $ r_ {25}^{25}^ - 1} $ $ t _ {\ rm e} $ - 敏感方法。 He，n，ne，s和ar梯度导致$ - $ 0.179 $ _ { - 0.146}^{+0.145} $，$ 0.431 $ _ { - 0.281}^{+0.282}^{+0.282} $，$ 0.171美元$ - $ 0.417 $ _ { - 0.182}^{+0.174} $，$ - $ 0.340 $ _ { - 0.157}^{+0.156} $，分别利用$ t _ {\ rm e} $ - 敏感的方法，分别从$ t _ {\ rm e} $ - 敏感的方法中。我们的结果证实了文献中假定的负轴对称全局金属分布的存在。我们注意到一个新的WC星候选人和一个过渡WR WN/C候选人。提出了M33螺旋结构的大设计模式。
Morphological and chemical structures of M33 are investigated with LAMOST DR7 survey. Physical parameters, extinction, chemical composition of He, N, O, Ne, S, Cl, Ar (where available), and radial velocities were determined for 110 nebulae (95 H\ii\ regions and 15 PNe) in M33. Among them, 8 PNe and 55 H\ii\ regions in M33 are newly discovered. We obtained the following O abundance gradients: $-$0.199$_{-0.030}^{+0.030}$ dex $R_{25}^{-1}$ (based on 95 H\ii\ regions), $-$0.124$_{-0.036}^{+0.036}$ dex $R_{25}^{-1}$ (based on 93 H\ii\ regions), and $-$0.207$_{-0.174}^{+0.160}$ dex $R_{25}^{-1}$ (based on 21 H\ii\ region), utilizing abundances from N2 at O3N2 diagnostics and the $T_{\rm e}$-sensitive method, respectively. The He, N, Ne, S, and Ar gradients resulted in slopes of $-$0.179$_{-0.146}^{+0.145}$, $-$0.431$_{-0.281}^{+0.282}$, $-$0.171$_{-0.239}^{+0.234}$, $-$0.417$_{-0.182}^{+0.174}$, $-$0.340$_{-0.157}^{+0.156}$, respectively, utilizing abundances from the $T_{\rm e}$-sensitive method. Our results confirm the existence of negative axisymmetric global metallicity distribution that is assumed in the literature. We noticed one new WC star candidate and one transition WR WN/C candidate. The grand-design pattern of spiral structure of M33 is presented.
