On the Measurement of Fundamental Parameters of White Dwarfs in the Gaia Era
On the Measurement of Fundamental Parameters of White Dwarfs in the Gaia Era
复制标题
盖亚时代白矮星基本参数的测量
DOI：
10.3847/1538-4357/ab153a
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
B. Rolland
中科院分区：
文献类型：
--
作者：
P. Bergeron;P. Dufour;G. Fontaine;S. Coutu;S. Blouin;C. Genest;A. Bédard;B. Rolland
我们提出了一个关键的审查确定白矮星的基本参数由盖亚任务发现。我们首先利用蒙特利尔白矮星数据库（MWDD）中包含的光度和光谱信息，结合从一组具有不同大气成分的自一致模式大气中计算的合成星等，重新解释了彩色星等和彩色星等图。然后将相同的模型应用于使用所谓的光度测量技术来测量白矮星的基本参数，该技术依赖于精确的盖亚三角视差测量，以及全景巡天望远镜和快速反应系统，斯隆数字巡天和盖亚的光度数据。特别地，我们详细地讨论了这些不同的光度系统所引起的系统效应。然后，我们非常详细地研究了在MWDD中光谱识别的白矮星以及盖亚发现的候选白矮星的质量分布作为有效温度的函数。我们特别注意假定的冷的、非da恒星的大气化学成分。我们还简要地回顾了白矮星质量半径关系的有效性，以及最近在DA白矮星的盖亚色星等图中发现的结晶特征。我们最终提供了证据，证明大多数白矮星的核心成分主要是碳和氧的混合物，这是恒星演化理论的预期结果，但在此之前从未得到过充分的实证证实。
We present a critical review of the determination of fundamental parameters of white dwarfs discovered by the Gaia mission. We first reinterpret color–magnitude and color–color diagrams using photometric and spectroscopic information contained in the Montreal White Dwarf Database (MWDD), combined with synthetic magnitudes calculated from a self-consistent set of model atmospheres with various atmospheric compositions. The same models are then applied to measure the fundamental parameters of white dwarfs using the so-called photometric technique, which relies on the exquisite Gaia trigonometric parallax measurements, and photometric data from Panoramic Survey Telescope And Rapid Response System, Sloan Digital Sky Survey, and Gaia. In particular, we discuss at length the systematic effects induced by these various photometric systems. We then study in great detail the mass distribution as a function of effective temperature for the white dwarfs spectroscopically identified in the MWDD, as well as for the white dwarf candidates discovered by Gaia. We pay particular attention to the assumed atmospheric chemical composition of cool, non-DA stars. We also briefly revisit the validity of the mass–radius relation for white dwarfs and the recent discovery of the signature of crystallization in the Gaia color–magnitude diagram for DA white dwarfs. We finally present evidence that the core composition of most of these white dwarfs is, in bulk, a mixture of carbon and oxygen, an expected result from stellar evolution theory, but never empirically well established before.
影响因子：
8.7
作者：
Becker, Andreas;Lorenzen, Winfried;Redmer, Ronald
通讯作者：
Redmer, Ronald