热前白矮星的星震学：DOV星PG 2131+066和PG 1707+427以及PNNV星NGC 1501的情况
Asteroseismology of hot pre-white dwarf stars: the case of the DOV stars PG 2131+066 and PG 1707+427, and the PNNV star NGC 1501
摘要：
我们对两颗高重力脉动PG 1159（GW Vir或DOV）恒星PG 2131+066和PG 1707+427以及脉动[WCE]恒星NGC 1501进行了星震学研究。我们计算绝热$g$模式脉动周期PG 1159演化模型与恒星质量范围从0.530到0.741 Msun。这些模型考虑到完整的演化的祖星，通过热脉冲AGB阶段，并再次发作。通过比较观测到的周期间距与渐近周期间距以及计算出的周期间距的平均值，我们约束了PG 2131+066、PG 1707+427和NGC 1501的恒星质量。我们还采用了个别观察到的周期，在搜索代表性的地震模型，为每一个明星。这项工作结束了我们对脉动前白矮星恒星的短系列星震学研究。我们的研究结果表明了星震学在探测前白矮星内部结构和演化状态方面的有用性。特别是，星震学能够确定PG 1159恒星的恒星质量，其精度与光谱学相当，甚至更好。
英文摘要：
We present an asteroseismological study on the two high-gravity pulsating PG1159 (GW Vir or DOV) stars, PG 2131+066 and PG 1707+427, and on the pulsating [WCE] star NGC 1501. We compute adiabatic $g$-mode pulsation periods on PG1159 evolutionary models with stellar masses ranging from 0.530 to 0.741 Msun. These models take into account the complete evolution of progenitor stars, through the thermally pulsing AGB phase, and born-again episode. We constrain the stellar mass of PG 2131+066, PG 1707+427 and NGC 1501 by comparing the observed period spacing with the asymptotic period spacing and with the average of the computed period spacings. We also employ the individual observed periods in search of representative seismological models for each star. This work closes our short series of asteroseismological studies on pulsating pre-white dwarf stars. Our results demonstrate the usefulness of asteroseismology for probing the internal structure and evolutionary status of pre-white dwarf stars. In particular, asteroseismology is able to determine stellar masses of PG1159 stars with an accuracy comparable or even better than spectroscopy.
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