论文标题
关于缺乏氢的低质量白矮人的形成
On the formation of hydrogen-deficient low-mass white dwarfs
论文作者
论文摘要
Two of the possibilities for the formation of low-mass ($M_{\star}\lesssim 0.5\,M_{\odot}$) hydrogen-deficient white dwarfs are the occurrence of a very-late thermal pulse after the asymptotic giant-branch phase or a late helium-flash onset in an almost stripped core of a red giant star.我们旨在评估星空学的潜力，以区分热闪光灯和非常粘液的热脉冲情景，以形成低质量氢的白色矮人。我们在两个进化场景的背景下，计算出低质量氢的白矮星的演变。我们探讨了所得模型的脉动特性，以表征有效的温度，这些温度表征了弹性氦富的白色矮人的不稳定性条。我们发现，在缺乏氢缺乏的白色矮人的不稳定性条中，白矮人模型在与低径向阶（$ k \ sillsim 10 $）重力模式相关的时期间距（$ k \ Lessim 10 $）相关的时期存在显着差异。对周期脉冲模式的测量值短于$ \ sim500 \，可以使用$ s来区分两种情况。此外，低质量脉动氢缺乏的白矮人的时期到周期性的星星震拟合可以帮助确定其进化史。
Two of the possibilities for the formation of low-mass ($M_{\star}\lesssim 0.5\,M_{\odot}$) hydrogen-deficient white dwarfs are the occurrence of a very-late thermal pulse after the asymptotic giant-branch phase or a late helium-flash onset in an almost stripped core of a red giant star. We aim to asses the potential of asteroseismology to distinguish between the hot flasher and the very-late thermal pulse scenarios for the formation of low-mass hydrogen-deficient white dwarfs. We compute the evolution of low-mass hydrogen-deficient white dwarfs from the zero-age main sequence in the context of the two evolutionary scenarios. We explore the pulsation properties of the resulting models for effective temperatures characterizing the instability strip of pulsating helium-rich white dwarfs. We find that there are significant differences in the periods and in the period spacings associated with low radial-order ($k\lesssim 10$) gravity modes for white-dwarf models evolving within the instability strip of the hydrogen-deficient white dwarfs. The measurement of the period spacings for pulsation modes with periods shorter than $\sim500\,$s may be used to distinguish between the two scenarios. Moreover, period-to-period asteroseismic fits of low-mass pulsating hydrogen-deficient white dwarfs can help to determine their evolutionary history.
