AI 中文总结
本研究通过星震学拟合，将KUV03442+0719分别建模为两种白矮星并对比，发现需更多脉动数据区分，还给出氦核白矮星的温度相关质光关系解析公式。
AI 中文摘要
氢大气白矮星KUV03442+0719于2006年由Gianninas等人首次报道为脉动星；Su等人2014年的后续观测发现了更多周期。部分光谱结果显示其质量略低于平均水平，有效温度为11000 K，但Gaia数据（视差与星等）表明它可能是一颗氦核低质量白矮星，这类天体应具有氦核。我们对KUV03442+0719进行星震学拟合，分别将其建模为碳/氧组成的正常质量白矮星和氦核低质量白矮星；研究采用WDEC模型开展网格搜索，并通过单纯形最小化对最优拟合结果进行优化。两种分析得到的最优模型拟合质量相当，需更多脉动数据才能区分两种情况。我们将结果与恒星演化预期对比，并给出氦核白矮星的温度相关质光关系解析公式。
英文摘要
Hydrogen atmosphere white dwarf KUV03442+0719 was first reported as a pulsator by Gianninas et al. in 2006. Follow up campaigns by Su et al. (2014) revealed more periods. Some spectroscopic results suggest that KUV03442+0719 has a slightly below average mass and an effective temperature of 11000 K. But Gaia data (parallax and magnitude) suggest that it may be a low mass white dwarf. Such an object would have a helium core. We perform the asteroseismic fitting of KUV03442+0719, modeling it both as a carbon/oxygen normal mass white dwarf, and a helium core, low mass white dwarf. To perform the study, we perfom a grid search with WDEC models, refined by simplex minimization of the best fits. Both analyses result in best fit models that are comparable in terms of quality of fit. More pulsation data would be required to allow us to distinguish between the two scenarios. We present and constrast our results with expectations from stellar evolution. We also provide analytic formulae for a temperature dependent mass-radius relationship for helium core white dwarfs.
Comments12 pages, 6 figures
Journal refThe Astrophysical Journal, December 2023, Volume 958, Issue 2, id.101
