The "F str 4077" star HD 177645 as a possible barium dwarf star
The "F str 4077" star HD 177645 as a possible barium dwarf star
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DOI：
10.1007/bf02044792
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发表时间：
1996-04-01
期刊：
影响因子：
0.700
通讯作者：
I. S. Savanov
中科院分区：
文献类型：
--
作者：
I. S. Savanov
用CCD机和大气模式法对“F str4077”星HD 177645的大气中12种元素的丰度进行了新的光谱观测。在这颗恒星上发现的过多的氮表明，它可能与双星系统中进化程度更高的伴星的质量转移导致其大气化学成分异常的钡矮星有关。作为一个与BA星和CH亚巨星有关的天体，有效温度T<ff</sup>=7150K的HD 177645也可能在主序列上部化学奇异星的扩散过程的化学成分特征上存在异常，这可以从其大气中硫的过度丰度来说明。
The abundances of 12 elements in the atmosphere of the "F str 4077" star HD 177645 have been determined from new spectroscopic observations with the CCD camera and the model atmosphere method. The overabundance of nitrogen found for this star indicates its possible relation to barium dwarfs with anomalies in the chemical composition of their atmospheres due to mass transfer from the more evolved companion in a binary system. As an object related to Ba stars and CH subgiants, HD 177645 with an effective temperature T <sub>eff</sub> =7150K may also have anomalies in the chemical composition characteristic of diffusion processes in chemically peculiar stars of the upper main sequence, as may be indicated by the overabundance of sulfur in its atmosphere.