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arXiv 1101.2622astro-ph.SR
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Be星HR 7409(7 Vul)的性质

On the nature of the Be star HR 7409 (7 Vul)

S. Vennes, A. Kawka, S. Jonic, I. Pirkovic, L. Iliev, J. Kubat, M. Slechta, P. Nemeth, M. Kraus

摘要:

HR 7409(7 Vul)是一颗新发现的Be星,可能是古尔德带的一部分,是一颗69天光谱双星的大质量组成部分。用Ondrejov天文台和Rozhen天文台的高色散谱测量了Be星的双星参数和性质,结果表明Be星存在一个低质量伴星(~ 0.5- 0.8Msun)。如果这对恒星相对年轻(<5000万年~ 8000万年),那么它的伴星是一颗K V型恒星,但是,按照另一种更古老的演化假设,伴星是一颗水平分支恒星,或者可能是一颗白矮星。在后一种情况下,过去从一颗演化的恒星到一颗质量较小的矮星的质量转移事件将是今天快速旋转的Be星的特殊性质的原因。

英文摘要:

HR 7409 (7 Vul) is a newly identified Be star possibly part of the Gould Belt and is the massive component of a 69-day spectroscopic binary. The binary parameters and properties of the Be star measured using high-dispersion spectra obtained at Ondrejov Observatory and at Rozhen Observatory imply the presence of a low mass companion (~ 0.5-0.8 M_sun). If the pair is relatively young (<50-80 Myr), then the companion is a K V star, but, following another, older evolutionary scenario, the companion is a horizontal-branch star or possibly a white dwarf star. In the latter scenario, a past episode of mass transfer from an evolved star onto a less massive dwarf star would be responsible for the peculiar nature of the present-day, fast-rotating Be star.

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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