Herbig Ae SB2系统HD 104237
The Herbig Ae SB2 System HD 104237
摘要：
双线分光双星HD 104237（DX Cha）是一个复杂系统的一部分，该系统由六颗附近的年轻恒星组成。我们报告了一个显着的变化，从1999年至2000年的观测SB2系统的轨道。我们从初级和次级光谱中获得丰度。丰度分析使用详细的光谱合成和基于W（λ）通常< 25 mA的弱吸收线的等效宽度的测定。主要元素中有25种元素的丰度，次要元素中有17种元素。除了锂和锆，丰度与太阳能没有明显的差异。相对于原生矿物的陨石值，锂的含量可能略有增加。它在第二阶段有点枯竭。发射线光谱是赫比格Ae星的典型光谱。我们比较和对比的光谱HD 104237主要和其他两个Herbig Ae星与低v.sin（i），HD 101412和HD 190073。
英文摘要：
The double-lined spectroscopic binary HD 104237 (DX Cha) is part of a complex system of some half-dozen nearby young stars. We report a significant change from an orbit for the SB2 system derived from 1999-2000 observations. We obtain abundances from the primary and secondary spectra. The abundance analysis uses both detailed spectral synthesis and determinations based on equivalent widths of weak absorption lines with W(lambda) typically < 25 mA. Abundances are derived for 25 elements in the primary, and 17 elements in the secondary. Apart from lithium and zirconium, abundances do not depart significantly from solar. Lithium may be marginally enhanced with respect to the meteoritic value in the primary. It somewhat depleted in the secondary. The emission-line spectrum is typical of Herbig Ae stars. We compare and contrast the spectra of the HD 104237 primary and two other Herbig Ae stars with low v.sin(i), HD 101412 and HD 190073.
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