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arXiv 1706.07008astro-ph.SR
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项目VeSElkA:HD41076和HD148330中化学物质的抽象分析

Project VeSElkA: Abundance analysis of chemical species in HD41076 and HD148330

V. Khalack, G. Gallant, C. Thibeault

摘要:

采用一种新的半自动方法对最近在CFHT用分光偏振仪ESPaDOnS获得的HD 41076和HD 148330的高分辨率光谱进行了丰度分析。这种方法允许在半自动模式下为修改后的ZEEMAN 2代码准备输入数据,并在单次运行期间按顺序分析数百条线路剖面。它还提供了更多关于每种化学元素在大气深层丰度分布的信息。我们分析了在HD 41076和HD 148330光谱中观察到的巴耳末分布,从而估计了它们的有效温度、重力、金属丰度和径向速度。用PHOENIX程序计算了各个恒星大气模型,并用修改后的ZEEMAN 2程序进行了丰度分析。分析表明,HD 41076恒星大气中C、N、F、Mg、Ca、Ti、V、Cu、Y、Mo、Sm和Gd等元素含量不足,Cr、Mn、Fe、Co、Ni、Sr、Zr、Ba、Ce、Nd和Dy等元素含量过剩。在HD148330大气中,C、N、Mo等元素含量偏低,而Ne、Na、Al、Si、P、Ca、Ti、V、Cr、Mn、Fe、Co、Ni、Zn、Sr、Y、Zr、Ba、Ce、Pr、Nd、Sm、Eu、Gd、Dy等元素含量偏高。我们还在HD41076中发现了Fe、Ti、Cr和Mn的垂直丰度分层,在HD148330中发现了Fe、Ti、V、Cr、Mn、Y、Zr、Ce、Nd、Sm和Gd的垂直丰度分层。

英文摘要:

A new semi-automatic approach is employed to carry out the abundance analysis of high-resolution spectra of HD41076 and HD148330 obtained recently with the spectropolarimetre ESPaDOnS at the CFHT. This approach allows to prepare in a semi-automatic mode the input data for the modified ZEEMAN2 code and to analyse several hundreds of line profiles in sequence during a single run. It also provides more information on abundance distribution for each chemical element at the deeper atmospheric layers. Our analysis of the Balmer profiles observed in the spectra of HD41076 and HD148330 has resulted in the estimates of their effective temperature, gravity, metallicity and radial velocity. The respective models of stellar atmosphere have been calculated with the code PHOENIX and used to carry out abundance analysis employing the modified ZEEMAN2 code. The analysis shows a deficit of the C, N, F, Mg, Ca, Ti, V, Cu, Y, Mo, Sm and Gd, and overabundance of Cr, Mn, Fe, Co, Ni, Sr, Zr, Ba, Ce, Nd and Dy in the stellar atmosphere of HD41076. In the atmosphere of HD148330, the C, N and Mo appear to be underabundant, while the Ne, Na, Al, Si, P, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Zn, Sr, Y, Zr, Ba, Ce, Pr, Nd, Sm, Eu, Gd and Dy are overabundant. We also have found signatures of vertical abundance stratification of Fe, Ti, Cr and Mn in HD41076, and of Fe, Ti, V, Cr, Mn, Y, Zr, Ce, Nd, Sm and Gd in HD148330.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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