食双星系统中经典造父变星的精确动力学质量测定
Accurate dynamical mass determination of a classical Cepheid in an eclipsing binary system
摘要：
恒星脉动理论提供了一种确定脉动的经典造父变星超巨星质量的方法--正是脉动导致它们的光度变化。这样的脉动质量被发现比从恒星演化理论得到的质量要小：这就是造父变星质量差异问题，这个问题还没有解决。为了确定哪一个是正确的，需要对双星系统中的经典造父变星（相对于II型造父变星，具有非常不同的演化历史的低质量恒星）进行独立的、精确的动力学质量测定。以前从银河系单线不食双星建立造父变星动态质量的努力的准确性通常约为15- 30%，这不足以解决质量差异问题。尽管进行了许多观测工作，但迄今为止还没有在食双线双星中发现经典造父变星的可靠报道。在这里，我们报告发现一个经典造父变星在一个良好的分离，双线食双星在大麦云云。我们确定的质量的精度为百分之一，并表明它同意其脉动质量，提供了强有力的证据，脉动理论正确和精确地预测了经典造父变星的质量
英文摘要：
Stellar pulsation theory provides a means of determining the masses of pulsating classical Cepheid supergiant - it is the pulsation that causes their luminosity to vary. Such pulsational masses are found to be smaller than the masses derived from stellar evolution theory: this is the Cepheid mass discrepancy problem, for which a solution is missing. An independent, accurate dynamical mass determination for a classical Cepheid variable star (as opposed to type-II Cepheids, low-mass stars with a very different evolutionary history) in a binary system is needed in order to determine which is correct. The accuracy of previous efforts to establish a dynamical Cepheid mass from Galactic single-lined noneclipsing binaries was typically about 15-30 per cent, which is not good enough to resolve the mass discrepancy problem. In spite of many observational efforts, no firm detection of a classical Cepheid in an eclipsing double-lined binary has hitherto been reported. Here we report the discovery of a classical Cepheid in a well detached, double-lined eclipsing binary in the Large Magellanic Cloud. We determine the mass to a precision of one per cent and show that it agrees with its pulsation mass, providing strong evidence that pulsation theory correctly and precisely predicts the masses of classical Cepheids
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。
