CP星的层积和同位素分离
Stratification and Isotope Separation in CP Stars
摘要：
我们调查的元素和同位素分层的大气中选择的化学奇特（CP）的上主序列的恒星。2004年，UVES光谱仪的重新配置使得有可能检查Ca II红外三重态的所有三条线。分析的大部分材料是在2008年获得的。我们支持Ryabchikova，Kochukhov和Bagnulo（RKB）的说法，即恒星10 Aql，HR 1217和HD 122970的钙同位素具有明显的分层剖面，重同位素集中在更高的层。需要更好的观测来了解Ca-40在所有或大多数显示Ca-48存在的CP恒星的最深层中占主导地位的程度。在一些HgMn星的光谱中几乎没有Ca-40的证据，而磁星HD 101065的红外三重态与纯Ca-48很好地拟合。在HR 5623（HD 133792）和HD 217522中，重同位素很可能占主导地位，尽管模型可能不是这种情况。虽然在许多情况下肯定需要元素分层，我们指出的重要性，包括调整假设的Teff和log（g）值，在尝试模型分层。我们建议强调最强线的轮廓，其中分层的影响最明显。同位素混合物，包括质量在40和48之间的4种稳定的钙核素是合理的，但没有强调。
英文摘要：
We investigate the elemental and isotopic stratification in the atmospheres of selected chemically peculiar (CP) stars of the upper main sequence. Reconfiguration of the UVES spectrograph in 2004 has made it possible to examine all three lines of the Ca II infrared triplet. Much of the material analyzed was obtained in 2008. We support the claim of Ryabchikova, Kochukhov & Bagnulo (RKB) that the calcium isotopes have distinct stratification profiles for the stars 10 Aql, HR 1217, and HD 122970, with the heavy isotope concentrated toward the higher layers. Better observations are needed to learn the extent to which Ca-40 dominates in the deepest layers of all or most CP stars that show the presence of Ca-48. There is little evidence for Ca-40 in the spectra of some HgMn stars, and the infrared triplet in the magnetic star HD 101065 is well fit by pure Ca-48. In HR 5623 (HD 133792) and HD 217522 it is likely that the heavy isotope dominates, though models are possible where this is not the case. While elemental stratification is surely needed in many cases, we point out the importance of including adjustments in the assumed Teff and log(g) values, in attempts to model stratification. We recommend emphasis on profiles of the strongest lines, where the influence of stratification is most evident. Isotopic mixtures, involving the 4 stable calcium nuclides with masses between 40 and 48 are plausible, but are not emphasized.
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