论文标题
黯然失色的二进制恒星的基本有效温度测量值-III。 Spiou近红外光谱和基准G0V星EBLM J0113+31的Cheops光度法
Fundamental effective temperature measurements for eclipsing binary stars -- III. SPIRou near-infrared spectroscopy and CHEOPS photometry of the benchmark G0V star EBLM J0113+31
论文作者
论文摘要
EBLM J0113+31是中等明亮的（v = 10.1），金属贫困（[Fe/h] $ \ of-0.3 $）G0V恒星，在宽阔的偏心轨道上有一个笨拙的M矮人伴侣（= 14.3 D）。我们已经使用了使用Spiou Spectrograph获得的近红外光谱法来测量M Dwarf光谱轨道的半振幅，以及Eclipse和从Cheops和Tess空间任务的高精度光度法，以测量该二进制系统的几何形状。从这些数据的组合分析以及先前发表的观察结果中，我们获得了以下独立的质量和半径：$ m_1 = 1.029 \ pm 0.025 m _ {\ odot} $，$ m_2 = 0.197 \ 0.197 \ pm pm 0.003 m _ { $ r_2 = 0.215 \ pm 0.002 r _ {\ odot} $。使用$ R_1 $和GAIA EDR3的视差，我们发现该恒星的角直径为$θ= 0.0745 \ pm 0.0007 $ mas。 G0V恒星的明显抛光通量已校正了灭绝和M dwarf（$ <0.2 $ <0.2 $）的贡献（$ <0.2 $）为$ {\ MATHCAL F} _ {\ oplus，0} =（2.62 \ pm 0.05）\ pm 0.05）因此，该G0V恒星具有有效温度$ t _ {\ rm eff，1} = 6124 {\ rm \，k} \ pm 40 {\ rm \，k \，k \，（rnd。）}} \ pm 10 {\ rm \ rm \ rm \，k \，（sys。）$。 EBLM J0113+31是理想的基准星，可用于通过大规模光谱调查测量的恒星参数的“端到端”测试，或源自与柏拉图的小星座学的恒星参数。这里开发的技术可以应用于许多其他黯淡的二进制文件，以创建这样的基准恒星网络。
EBLM J0113+31 is moderately bright (V=10.1), metal-poor ([Fe/H]$\approx-0.3$) G0V star with a much fainter M dwarf companion on a wide, eccentric orbit (=14.3 d). We have used near-infrared spectroscopy obtained with the SPIRou spectrograph to measure the semi-amplitude of the M dwarf's spectroscopic orbit, and high-precision photometry of the eclipse and transit from the CHEOPS and TESS space missions to measure the geometry of this binary system. From the combined analysis of these data together with previously published observations we obtain the following model-independent masses and radii: $M_1 = 1.029 \pm 0.025 M_{\odot}$, $M_2 = 0.197 \pm 0.003 M_{\odot}$, $R_1 = 1.417 \pm 0.014 R_{\odot}$, $R_2 = 0.215 \pm 0.002 R_{\odot}$. Using $R_1$ and the parallax from Gaia EDR3 we find that this star's angular diameter is $θ= 0.0745 \pm 0.0007$ mas. The apparent bolometric flux of the G0V star corrected for both extinction and the contribution from the M dwarf ($<0.2$ per cent) is ${\mathcal F}_{\oplus,0} = (2.62\pm 0.05)\times10^{-9}$ erg.cm$^{-2}$.s$^{-1}$. Hence, this G0V star has an effective temperature $T_{\rm eff,1} = 6124{\rm\,K} \pm 40{\rm \,K\,(rnd.)} \pm 10 {\rm \,K\,(sys.)}$. EBLM J0113+31 is an ideal benchmark star that can be used for "end-to-end" tests of the stellar parameters measured by large-scale spectroscopic surveys, or stellar parameters derived from asteroseismology with PLATO. The techniques developed here can be applied to many other eclipsing binaries in order to create a network of such benchmark stars.
