A note on the use of surface offset corrections in asteroseismic model fitting

A note on the use of surface offset corrections in asteroseismic model fitting
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关于星震模型拟合中使用表面偏移校正的说明

DOI:
10.1051/0004-6361/201526177
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发表时间:
2015
影响因子:
6.5
通讯作者:
Roxburgh I
Roxburgh I
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Roxburgh I

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我们认真研究了在寻找最适合观测恒星的模型之前,在恒星模型的频率上添加幂函数表面偏移量校正(ν)的做法。我们发现,内部结构、相移和分离比的表层独立指标在频率上移动了f(ν),因此与模型的结果不同。因此,这种最佳拟合模型并不具有与观测到的恒星完全相同的内部结构。利用对STAR HD 177153的结果,我们表明,对于使用表层独立程序获得的最佳拟合模型,观测频率和模型频率之间的差异具有很大范围的不同偏移量,这些不同的偏移量通常不遵循类似凯尔德森的幂定律,并且进一步地,使用偏移校正程序获得的最佳拟合模型不一定满足内部结构的表层独立约束。
We critically investigate the practice of adding a power-law surface offset correctionf(ν) to the frequencies of stellar models prior to seeking best fit models to an observed star. We show that surface layer independent indicators of the internal structure, phase shifts and separation ratios, are displaced in frequency byf(ν) and are therefore not the same as those of the model. Consequently such best fit models do not have exactly the same interior structure as the observed star. Using results on the star HD 177153 we show that the difference between observed and model frequencies for best fit models obtained using surface layer independent procedures have a wide range of different offsets which do not in general follow a Kjeldsen-like power law, and further that best fit models obtained using the offset correction procedure do not necessarily satisfy surface layer independent constraints on the internal structure.
DOI: 10.1051/0004-6361/201425289
发表时间: 2014-06
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