未演化的F型食双星BT狐狸座的绝对尺寸
Absolute dimensions of the unevolved F-type eclipsing binary BT Vulpeculae
摘要：
本文报道了1.14天的分离双线食双星BT Vul（F0+F7）的V波段差分测光和高分辨率光谱。我们的径向速度监测和光变曲线分析得出主星的绝对质量和半径为M1 = 1.5439 +/- 0.0098 MSun和R1 = 1.536 +/- 0.018 RSun，而主星的绝对质量和半径为M2 = 1.2196 +/- 0.0080 MSun和R2 = 1.151 +/- 0.029 RSun。有效温度分别为7270 +/- 150 K和6260 +/- 180 K。这两颗恒星都是快速旋转的，轨道是圆形的。与来自MIST系列的恒星演化模型的比较表明，对于[Fe/H] = +0.08和3.5亿年的年龄，与这些测定结果非常吻合。BT Vul的两个组成部分非常接近零年龄的主序列。
英文摘要：
We report extensive differential V-band photometry and high-resolution spectroscopy for the 1.14 day, detached, double-lined eclipsing binary BT Vul (F0+F7). Our radial-velocity monitoring and light curve analysis lead to absolute masses and radii of M1 = 1.5439 +/- 0.0098 MSun and R1 = 1.536 +/- 0.018 RSun for the primary, and M2 = 1.2196 +/- 0.0080 MSun and R2 = 1.151 +/- 0.029 RSun for the secondary. The effective temperatures are 7270 +/- 150 K and 6260 +/- 180 K, respectively. Both stars are rapid rotators, and the orbit is circular. A comparison with stellar evolution models from the MIST series shows excellent agreement with these determinations, for a composition of [Fe/H] = +0.08 and an age of 350 Myr. The two components of BT Vul are very near the zero-age main sequence.
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