Close binary evolution

闭合二元演化

• 批准号: 164029294
• 负责人: Privatdozent Dr. Axel Schwope
• 金额: --
• 依托单位: Leibniz-Institut für Astrophysik Potsdam (AIP)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/164029294?language=en
• 关键词: Close; binary; evolution

The evolution of close binary stars has three major unknowns: (a) How efficient is the common envelope phase in reducing the binary separation? (b) How strong is orbital angular momentum loss due to magnetic braking? (c) Does magnetic braking vanish if the secondary star is fully convective? Those questions can be answered by a thorough observationally study of white-dwarf/main-sequence binaries which have passed the common envelope phase in their binary evolution. The objects are abundant, although not yet known, they are sufficiently bright, the evolution of the binary components is reasonably well understood, and their light is not contaminated by accretion radiation. Based on archival SDSS data and own SEGUE spectroscopy we are generating a large data base of white-dwarf/main-sequence binaries, which harbour some 25% of close binaries of post-common envelope type. We are conducting a large-scale coordinated optical follow-up program to identify the close binaries, determine their orbital periods and perform a thorough statistical study to observationally constrain the magnetic braking law and to constrain the common envelope efficiency.

近距离双星的演化有三个主要未知数：(A)公共包络相位在减少双星间隔方面有多有效？(B)磁制动造成的轨道角动量损失有多大？(C)如果副星是完全对流的，磁制动会消失吗？这些问题可以通过对白矮星/主序双星进行彻底的观测研究来回答，白矮星/主序双星在双星演化中已经度过了共同的包络阶段。这些天体很丰富，虽然还不为人所知，但它们足够明亮，二元组分的演化已经被很好地理解了，它们的光没有受到吸积辐射的污染。基于存档的SDSS数据和OWN SEGUE光谱，我们正在生成一个大型的白矮星/主序双星数据库，其中包含约25%的后共同包络类型的紧密双星。我们正在进行大规模的协调光学跟踪计划，以识别近双星，确定它们的轨道周期，并进行彻底的统计研究，以从观测上约束磁制动规律，并限制公共包络效率。

项目成果

A precision study of two eclipsing white dwarf plus M dwarf binaries

• DOI: 10.1111/j.1365-2966.2011.20251.x
• 发表时间: 2011-11
• 期刊: Scopus
• 作者: S. G. Parsons;Tom Marsh;B. Gänsicke;A. Rebassa-Mansergas;V. Dhillon;S. Littlefair;C. Copperwheat;R. Hickman;M. Burleigh;P. Kerry;D. Koester;A. N. G'omez-Mor'an;S. Pyrzas;C. Savoury;M. Schreiber;L. Schmidtobreick;A. Schwope;P. Steele;Claus Tappert

Post-common envelope binaries from SDSS – XIV. The DR7 white dwarf–main-sequence binary catalogue

来自 SDSS – XIV DR7 白矮星 – 主序二星目录的后公共包络双星

• DOI: 10.1111/j.1365-2966.2011.19923.x
• 发表时间: 2012
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Rebassa-Mansergas;Nebot Gomez-Moran;Schreiber;Gänsicke;Schwope
• 通讯作者: Schwope