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arXiv 1804.05976astro-ph.SR
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在CHARA阵列用PAVO测量的五个演化的中等质量行星宿主星的干涉直径

Interferometric diameters of five evolved intermediate-mass planet-hosting stars measured with PAVO at the CHARA Array

T. R. White, D. Huber, A. W. Mann, L. Casagrande, S. K. Grunblatt, A. B. Justesen, V. Silva Aguirre, T. R. Bedding, M. J. Ireland, G. H. Schaefer, P. G. Tuthill

摘要:

关于中等质量恒星周围行星出现率的争论取决于对演化恒星质量的准确测定,并且由于缺乏可靠的,直接测量的这些恒星的基本属性而加剧。我们提出了长基线光学干涉测量的五个演变的中等质量($\sim\,1.5\,\mathrm{M}_\odot$)行星托管恒星使用的PAVO光束组合器在CHARA阵列,我们结合热通量测量和反射来确定它们的半径和有效温度。我们测量了6 Lyncis($5.12\pm0.16\,\mathrm{R}_\odot$,$4949\pm58\,\mathrm{K}$)、24 Sextantis($5.49\pm0.18\,\mathrm{R}_\odot$,$4908\pm65\,\mathrm{K}$)、$κ$ Coronae Borealis($4.77\pm0.07\,\mathrm{R}_\odot$,$4870\pm47\,\mathrm{K}$)、HR 6817($4.45\pm0.08\,\mathrm{R}_\odot$,$5013\pm59\,\mathrm{K}$)和HR 8641($4.91\pm0.12\,\mathrm{R}_\odot$,$4950\pm68\,\mathrm{K}$)的半径和有效温度。我们发现通常15%的角直径和$\sim$ 200 K的温度相比,在文献中的干涉测量的分歧,但良好的协议与光谱和光度的温度,得出的结论是,以前的干涉测量可能会受到系统误差超过其正式的不确定性。模型的基础上BaSTI等时线使用各种设置的asteroseismic,光谱和干涉仪的限制往往有利于轻微($\sim$ 15%)较低的质量比一般在文献中报道。

英文摘要:

Debate over the planet occurrence rates around intermediate-mass stars has hinged on the accurate determination of masses of evolved stars, and has been exacerbated by a paucity of reliable, directly-measured fundamental properties for these stars. We present long-baseline optical interferometry of five evolved intermediate-mass ($\sim\,1.5\,\mathrm{M}_\odot$) planet-hosting stars using the PAVO beam combiner at the CHARA Array, which we combine with bolometric flux measurements and parallaxes to determine their radii and effective temperatures. We measured the radii and effective temperatures of 6 Lyncis ($5.12\pm0.16\,\mathrm{R}_\odot$, $4949\pm58\,\mathrm{K}$), 24 Sextantis ($5.49\pm0.18\,\mathrm{R}_\odot$, $4908\pm65\,\mathrm{K}$), $κ$ Coronae Borealis ($4.77\pm0.07\,\mathrm{R}_\odot$, $4870\pm47\,\mathrm{K}$), HR 6817 ($4.45\pm0.08\,\mathrm{R}_\odot$, $5013\pm59\,\mathrm{K}$), and HR 8641 ($4.91\pm0.12\,\mathrm{R}_\odot$, $4950\pm68\,\mathrm{K}$). We find disagreements of typically 15 per cent in angular diameter and $\sim$200 K in temperature compared to interferometric measurements in the literature, yet good agreement with spectroscopic and photometric temperatures, concluding that the previous interferometric measurements may have been affected by systematic errors exceeding their formal uncertainties. Modelling based on BaSTI isochrones using various sets of asteroseismic, spectroscopic, and interferometric constraints tends to favour slightly ($\sim$15 per cent) lower masses than generally reported in the literature.

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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