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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Spectroscopic abundance analyses of the He-3 stars HD 185330 and 3 CenA
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Spectroscopic abundance analyses of the He-3 stars HD 185330 and 3 CenA

机译：HE-3星HD 185330和3 Cena的光谱丰度分析

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摘要

Abundances of 21 elements in two He-3 stars, HD 185330 and 3 Cen A, have been analysed relative to the well-studied sharp-lined B3 V star i Her. Six elements (P, Ti, Mn, Fe, Ni, and Br) are over-abundant in these two peculiar stars, while six elements (C, O, Mg, Al, S, and Cl) are under-abundant. Absorption lines of the two rarely observed heavy elements Br II and Kr II are detected in both stars and these elements are both overabundant. The centroid wavelengths of the Ca II infrared triplet lines in these stars are redshifted relative to those lines in i Her and the presence of heavy isotopes of Ca (mass number 44-46) in these two stars is confirmed. In spite of these similarities, there are several remarkable differences in abundance pattern between these two stars. N is under-abundant in HD185330, as in many Hg-Mn stars, while it is significantly over-abundant in 3 Cen A. P and Ga are both over-abundant in 3 Cen A, while only P is over-abundant and no trace of absorption line of Ga II can be found in HD 185330. Large over-abundances of Kr and Xe are found in both stars, while the abundance ratio Kr/Xe is significantly different between them (-1.4 dex in HD185330 and +1.2 dex in 3 Cen A). Some physical explanations are needed to account for these qualitative differences.
机译：我们分析了两颗He-3星HD 185330和3 Cen A中的21种元素的丰度，它们与经过充分研究的锐线B3 V星i Her有关。在这两颗奇特的恒星中，六种元素（P、Ti、Mn、Fe、Ni和Br）的含量过多，而六种元素（C、O、Mg、Al、S和Cl）的含量不足。在这两颗恒星中都检测到了两种罕见的重元素Br II和Kr II的吸收线，而且这些元素都过多。这些恒星中的Ca II红外三重态线的质心波长相对于这些线发生了红移，证实了这两颗恒星中存在Ca的重同位素（质量数44-46）。尽管有这些相似之处，但这两颗恒星在丰度模式上有几个显著的差异。与许多Hg-Mn恒星一样，N在HD185330中含量不足，而在3 Cen A中含量显著过高。P和Ga在3 Cen A中含量均过高，而只有P含量过高，在HD185330中未发现Ga II的吸收线。在这两颗恒星中都发现了大量的Kr和Xe，而它们之间的Kr/Xe丰度比有显著差异（HD185330为-1.4 dex，3 cena为+1.2 dex）。需要一些物理解释来解释这些质量差异。

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