Determination of basic neutron star parameters from spectral modeling of X-ray bursters

通过 X 射线爆发的光谱模型确定基本中子星参数

• 批准号: 330634413
• 负责人: Professor Dr. Klaus Werner
• 金额: --
• 依托单位: Abteilungen Astronomie und Hochenergieastrophysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/330634413?language=en
• 关键词: Determination; basic; neutron; star; parameters

Measuring neutron star (NS) radii and masses is an essential tool to investigate the properties of matter at super-nuclear densities. Thermal emission during thermonuclear X-ray bursts from NSs in low-mass X-ray binaries provides a unique opportunity to determine NS parameters, because of the high fluxes, large luminosity variations and the related changes in the spectral properties. We introduced the cooling tail method that uses hot NS atmosphere models to convert the observed spectral evolution during cooling stages of X-ray bursts to the Eddington flux and the stellar angular size. These are then translated to constraints on mass and radius. In this project we will investigate and eliminate systematic uncertainties which can potentially affect the results, namely the effects of stellar rotation and atmosphere expansion during the burst. We will also explore a new approach to constrain NS parameters.

测量中子星 (NS) 半径和质量是研究超核密度物质特性的重要工具。由于高通量、大光度变化以及光谱特性的相关变化，低质量 X 射线双星中的 NS 热核 X 射线爆发期间的热发射提供了确定 NS 参数的独特机会。我们引入了冷却尾法，该方法使用热 NS 大气模型将 X 射线爆发冷却阶段观测到的光谱演化转换为爱丁顿通量和恒星角大小。然后将这些转化为质量和半径的约束。在这个项目中，我们将研究并消除可能影响结果的系统不确定性，即爆发期间恒星旋转和大气膨胀的影响。我们还将探索一种约束 NS 参数的新方法。

项目成果

Observational appearance of rapidly rotating neutron stars

• DOI: 10.1051/0004-6361/202037502
• 发表时间: 2020-05
• 期刊: Astronomy & Astrophysics
• 影响因子: 6.5
• 作者: V. Suleimanov;J. Poutanen;K. Werner

Hard X-ray view on intermediate polars in theGaiaera

• DOI: 10.1093/mnras/sty2952
• 发表时间: 2018-09
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: V. Suleimanov;V. Doroshenko;K. Werner

Magnetospheric return-current-heated atmospheres of rotation-powered millisecond pulsars

• DOI: 10.1051/0004-6361/202037824
• 发表时间: 2020-02
• 期刊: Astronomy & Astrophysics
• 影响因子: 6.5
• 作者: Tuomo Salmi;V. Suleimanov;J. Nattila;J. Poutanen

Evidence for the Photoionization Absorption Edge in a Photospheric Radius Expansion X-Ray Burst from GRS 1747–312 in Terzan 6

• DOI: 10.3847/1538-4357/aade8e
• 发表时间: 2018-08
• 期刊: The Astrophysical Journal
• 作者: Z. Li;V. Suleimanov;J. Poutanen;Tuomo Salmi;M. Falanga;J. Nattila;R. Xu

Accretion heated atmospheres of X-ray bursting neutron stars

• DOI: 10.1051/0004-6361/201833581
• 发表时间: 2018-08
• 期刊: Astronomy & Astrophysics
• 影响因子: 6.5
• 作者: V. Suleimanov;J. Poutanen;K. Werner