论文标题
重金属热分子的不透明度建模。 sr $^0 $，y $^{+} $和zr $^{2+} $的光电定化
Opacity modelling of heavy-metal hot subdwarfs. Photoionization of Sr$^0$, Y$^{+}$ and Zr$^{2+}$
论文作者
论文摘要
重金属热细分（SDB和SDO）代表了一小群恒星，其大气中具有异常高的反铁元素，其大量太阳能大约10000倍。一个例子是LS IV-14 $^{\ Circ} $ 116，其中已经在光频段4000-5000 A中观察到许多重金属吸收行，Y III和Zr IV的许多重金属吸收线。我们使用完全相关的dirac dirac dirac rotic dirac r-matrix（darc（darc），以计算光照相Zr $^{2+} $从他们的基础状态到20世纪兴奋的水平。我们使用横截面和振荡器强度来模拟热分子的光谱。我们为研究的三个离子获得了完整的光电离横截面。我们使用这些数据来计算热分子恒星的恒星大气的不透明度，并表明，对于在某些重型金属亚dwarves中观察到的过度膨胀，尤其是来自锆石的光启动，确实在模型中造成了一些后卫变暖。
Heavy-metal hot subdwarfs (sdB and sdO) represent a small group of stars with unusually high concentrations of trans-iron elements in their atmospheres, having abundances ~ 10000 times solar. One example is LS IV-14$^{\circ}$ 116, where a number of heavy-metal absorption lines of Sr II, Y III and Zr IV have been observed in the optical band 4000 - 5000 A. We use a fully relativistic Dirac atomic R-Matrix (DARC) to calculate photoionization cross sections of Sr$^{0}$, Y$^{+}$ and Zr$^{2+}$ from their ground state to the twentieth excited level. We use the cross sections and the oscillator strengths to simulate the spectrum of a hot subdwarf. We obtain complete sets of photoionization cross sections for the three ions under study. We use these data to calculate the opacity of the stellar atmospheres of hot subdwarf stars, and show that for overabundances observed in some heavy-metal subdwarves, photo-excitation from zirconium, in particular, does contribute some back warming in the model.
