Asteroseismic inferences on GW virginis variable stars in the frame of new PG 1159 evolutionary models
Asteroseismic inferences on GW virginis variable stars in the frame of new PG 1159 evolutionary models
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DOI：
10.1051/0004-6361:20054199
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发表时间：
2006-03
影响因子：
6.5
通讯作者：
A. C'orsico;L. Althaus
中科院分区：
文献类型：
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作者：
A. C'orsico;L. Althaus
提出了GW - Vir星的绝热、非径向脉动研究。脉动计算基于不同恒星质量的PG 1159演化序列，这些演化序列是人工从0.5895 m的完整演化序列中推导出来的，该演化序列是通过考虑祖先恒星的演化历史而计算出来的。在模型到达GW Vir域的低光度、高重力阶段之前，通过适当缩放0.5895-Msequence的恒星质量构建了人工序列。我们计算了适合于GW Vir变星的g型脉动周期。详细讨论了PG 1159模型的模式捕获特性。我们发现PG 1159模型的模式捕获特征主要是由先前对流超调留下的核心化学剖面的阶梯形状固定的。至少在观测到的GW Vir恒星的周期范围内，这一点尤其正确。此外，我们还对GW Vir恒星PG 1159-035、PG 2131+066、PG 1707+427和PG 0122+200的内部结构进行了星震推断。
An adiabatic, nonradial pulsation study of GW Vir stars is presented. The pulsation calculations were based on PG 1159 evolutionary sequences with different stellar masses artificially derived from a full evolutionary sequence of 0.5895 Mthat has been computed by taking the evolutionary history of the progenitor star into account. The artificial sequences were constructed by appropriately scaling the stellar mass of the 0.5895-Msequence well before the models reached the low-luminosity, high-gravity stage of the GW Vir domain. We computed g-mode pulsation periods appropriate to GW Vir variable stars. The implications for the mode-trapping properties of our PG 1159 models are discussed at length. We found that the mode-trapping features characterizing our PG 1159 models are mostly fixed by the stepped shape of the core chemical profile left by prior convective overshooting. This is particularly true at least for the range of periods observed in GW Vir stars. In addition, we make asteroseismic inferences about the internal structure of the GW Vir stars PG 1159-035, PG 2131+066, PG 1707+427, and PG 0122+200.