太阳丰度变化对低度振荡的敏感性
Sensitivity of low degree oscillations to the change in solar abundances
摘要：
上下文最近确定的太阳化学成分，使用随时间变化的三维流体动力学模型的太阳大气，表现出显着减少的C，N，O丰度相比，他们以前的值。使用这些新丰度的太阳模型与声速剖面、表面氦丰度和对流区深度的日震测定不一致。目标。我们研究了太阳丰度变化对太阳核的强约束的低阶p模和g模特性的影响。我们特别考虑在新的太阳混合物中氖丰度的增加，以减少使用新丰度和日震学的模型之间的差异。方法. GOLF仪器对太阳频率的观测测定被用来检验用不同化学成分计算的太阳模型。我们认为，特别是归一化的小频率间距在低度p模式的频率范围。结果低阶小频率间隔对重元素丰度的变化非常敏感，特别是氖。我们表明，通过考虑所有的地震的限制，包括小的频率间隔，一个相当大的增加氖丰度约（0.5 +/- 0.05）德克斯可以是一个很好的解决方案，使用新的丰度和低度日震学的太阳模型之间的差异，受到轻微调整的太阳年龄和最高丰度。我们还表明，太阳丰度的变化，特别是氖，大大影响g-模式的频率，与新老模型之间的相对频率差异高于1.5%
英文摘要：
Context. The most recent determination of the solar chemical composition, using a time-dependent, 3D hydrodynamical model of the solar atmosphere, exhibits a significant decrease of C, N, O abundances compared to their previous values. Solar models that use these new abundances are not consistent with helioseismological determinations of the sound speed profile, the surface helium abundance and the convection zone depth. Aims. We investigate the effect of changes of solar abundances on low degree p-mode and g-mode characteristics which are strong constraints of the solar core. We consider particularly the increase of neon abundance in the new solar mixture in order to reduce the discrepancy between models using new abundances and helioseismology. Methods. The observational determinations of solar frequencies from the GOLF instrument are used to test solar models computed with different chemical compositions. We consider in particular the normalized small frequency spacings in the low degree p-mode frequency range. Results. Low-degree small frequency spacings are very sensitive to changes in the heavy-element abundances, notably neon. We show that by considering all the seismic constraints, including the small frequency spacings, a rather large increase of neon abundance by about (0.5 +/- 0.05)dex can be a good solution to the discrepancy between solar models that use new abundances and low degree helioseismology, subject to adjusting slightly the solar age and the highest abundances. We also show that the change in solar abundances, notably neon, considerably affects g-mode frequencies, with relative frequency differences between the old and the new models higher than 1.5%
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