Asteroseismological measurements on PG 1159-035, the prototype of the GW Virginis variable stars
Asteroseismological measurements on PG 1159-035, the prototype of the GW Virginis variable stars
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DOI：
10.1051/0004-6361:20078646
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发表时间：
2007-12
影响因子：
6.5
通讯作者：
A. C'orsico;L. Althaus;S. O. Kepler;J. E. Costa;M. M. Bertolami-M.
中科院分区：
文献类型：
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作者：
A. C'orsico;L. Althaus;S. O. Kepler;J. E. Costa;M. M. Bertolami-M.
目标。在Miller Bertolami & Althaus （2006, A&A, 454,845）提出的PG 1159演化模型的基础上，对GW Vir变星的原型PG 1159−035进行了星震学研究。方法。我们在PG 1159演化模型上进行了大量的绝热g模脉动周期计算，恒星质量范围为0.530 ~ 0.741 M μ。这些模型来自于原始恒星的完整演化，包括热脉冲AGB阶段和重生阶段。通过将观测到的周期间隔与渐近周期间隔和计算周期间隔的平均值进行比较，我们对PG 1159−035的恒星质量进行了约束。我们还采用Costa等人（2007）报告的单个观测周期来寻找PG 1159−035的代表性地震学模型。
Aims. An asteroseismological study of PG 1159−035, the prototype of the GW Vir variable stars, has been performed on the basis of detailed and full PG 1159 evolutionary models presented by Miller Bertolami & Althaus (2006, A&A, 454, 845). Methods. We carried out extensive computations of adiabatic g-mode pulsation periods on PG 1159 evolutionary models with stellar masses spanning the range 0.530 to 0.741 M� . These models were derived from the complete evolution of progenitor stars, including the thermally pulsing AGB phase and the born-again episode. We constrained the stellar mass of PG 1159−035 by comparing the observed period spacing with the asymptotic period spacing and with the average of the computed period spacings. We also employed the individual observed periods reported by Costa et al. (2007) to find a representative seismological model for PG 1159−035.