Collaborative Research: White Dwarfs in Binaries Across the H-R Diagram with the APOGEE-GALEX-Gaia Catalog

合作研究：使用 APOGEE-GALEX-Gaia 目录在 H-R 图上的双星中的白矮星

• 批准号: 2307864
• 负责人: Steven Majewski
• 金额: $ 19.32万
• 依托单位: University of Virginia Main Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-09-01 至 2026-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2307864&HistoricalAwards=false
• 关键词: Collaborative; Research; White; Dwarfs; Binaries

More than 95 percent of stars will eventually end up as white dwarfs - the remains of stars that have used up their nuclear fuel and collapsed to a size equivalent to Earth but with a mass comparable to the Sun. Many of these white dwarfs are locked in a cosmic dance with stellar companions, where they orbit around each other and exchange mass. Such close white dwarf binary systems offer an excellent opportunity to study the late stages of stellar evolution. They can also be used as tracers of the dynamics of the Milky Way galaxy, and they are potential sources of gravitational waves. The goal of this project is to collect data on these systems at a wide range of wavelengths to characterize them and investigate fundamental properties, like what they are made of and how much mass they are sharing. This work will also provide several projects for science students at various stages, and the investigators will work with experts in accessibility to create training programs to teach astronomy to blind and visually impaired people. Most white dwarfs inhabit multiple systems, and a large fraction of those are compact enough to exchange mass, changing the structures and subsequent evolution of both stars. The physical mechanisms that mediate these mass exchanges include common envelope evolution, Roche lobe overflow, wind accretion, mass stripping, and stellar mergers. The main goal of this proposal is to further our understanding of mass transfer processes in interacting systems by assembling a unique observational sample of thousands of post mass-transfer binaries. The source sample combines the GALEX and Gaia databases with APOGEE — a high resolution (R=22,500), high signal-to-noise, multi-epoch, infrared (1.51 μm to 1.69 μm), spectroscopic survey of stars across the Milky Way — to build the most exhaustive survey of post-mass transfer binaries, containing systems with main sequence, subgiant, red giant, and red clump companions. The creation of this APOGEE-GALEX-Gaia Catalog and the proposed analysis of the resulting data set will improve our knowledge of the population of post-mass transfer binaries containing a white dwarf, and map the changes in their properties as a function of the evolution of the non-degenerate companion.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

超过 95% 的恒星最终将成为白矮星，这是恒星耗尽核燃料并坍塌至与地球相当但质量与太阳相当的残骸，其中许多白矮星被锁定。与恒星伴星的宇宙舞蹈，它们围绕彼此运行并交换质量，为研究恒星演化的后期提供了绝佳的机会，它们也可以用作银河系动力学的示踪剂。星系，它们是引力波的潜在来源，该项目的目标是在广泛的波长范围内收集这些系统的数据，以表征它们并研究基本特性，例如它们的构成和质量。这项工作还将为不同阶段的理科学生提供几个项目，研究人员将与无障碍专家合作创建培训计划，向盲人和视障人士教授天文学知识大多数白矮星居住在多个系统中，并且很大一部分。其中足够紧凑，可以交换质量，改变了两颗恒星的结构和随后的演化，介导这些质量交换的物理机制包括共同包层演化、罗氏瓣溢出、风吸积、质量剥离和恒星合并。该提议的主要目标是加深我们的理解。通过组装数千个传质后双星的独特观测样本，对相互作用系统中的传质过程进行分析。源样本将 GALEX 和 Gaia 数据库与 APOGEE（一种高分辨率）结合起来。 (R=22,500)、高信噪比、多历元、红外（1.51 μm 至 1.69 μm）、对整个银河系恒星的光谱调查——建立对质量转移后双星系统最详尽的调查，包含系统包括主序带、次巨星、红巨星和红团簇伴星。APOGEE-GALEX-Gaia 目录的创建以及对所得数据的拟议分析。该套装将提高我们对包含白矮星的质量转移后双星群​​体的了解，并将其性质的变化绘制为非简并伴星演化的函数。该奖项反映了美国国家科学基金会的法定使命，并被认为是值得的通过使用基金会的智力优势和更广泛的影响审查标准进行评估来获得支持。