标题： 织女星新星 V1674 的全面光变曲线模型 显示英文标题

标题： A comprehensive light curve model of the very fast nova V1674 Herculis

摘要： V1674 Her是最快的新星之一，其非常早期的阶段包括光学亮度从开始到峰值超过10个星等都得到了很好的观测。 我们提出了V1674 Her的一个完整的理论光变曲线模型。 我们的$1.35~M_\odot$白矮星（WD）模型，具有$1\times 10^{-11}~M_\odot$年$^{-1}$的质量吸积率，可以解释总体特性，包括光学亮度的快速上升和衰减的$V$光变曲线。 白矮星的光球半径扩展到$21 ~R_\odot$，因此一颗$0.26 ~M_\odot$伴星每3.67小时绕白矮星运行，在热核失控开始后2.7小时被吞噬，并在之后5.3天出现。 X射线闪光的持续时间仅为0.96小时。 膨胀包层的演化和光球半径的时间变化与轨道周期和自转周期（501秒）的观测光学和X射线调制非常一致。 我们确认新星光变曲线的衰减阶段可以用一系列稳态包层解很好地逼近。 利用超新星光变曲线的时间拉伸方法，我们得到$V$波段距离模数为$(m-M)_V= 16.3\pm 0.2$，并确定消光为$E(B-V)= 0.5 \pm 0.05$时的距离为$d=8.9\pm 1$千秒差距。 显示英文摘要

摘要： V1674 Her is one of the fastest novae, of which the very early phase is well observed including optical rise to the peak over 10 magnitudes. We present a full theoretical light curve model of V1674 Her. Our $1.35~M_\odot$ white dwarf (WD) model with the mass accretion rate of $1\times 10^{-11}~M_\odot$ yr$^{-1}$ explains overall properties including a very fast rise and decay of the optical $V$ light curve. The WD photosphere expands up to $21 ~R_\odot$, thus, a $0.26 ~M_\odot$ companion star orbiting the WD every 3.67 hours, is engulfed 2.7 hours after the onset of thermonuclear runaway, and appears 5.3 days after that. The duration of X-ray flash is only 0.96 hours. The evolution of the expanding envelope and temporal change of the photospheric radius are very consistent with observed optical and X-ray modulations with the orbital and spin (501 s) periods. We confirmed that the decay phase of nova light curve is well approximated by a sequence of steady-state envelope solutions. Using time-stretching method of nova light curves, we obtain the $V$ band distance modulus of $(m-M)_V= 16.3\pm 0.2$, and determine the distance to be $d=8.9\pm 1$ kpc for the interstellar extinction of $E(B-V)= 0.5 \pm 0.05$.