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Supersoft X-ray sources (SSSs) are known as possible progenitors of Type Ia supernovae. The quasi-periodic variability has been detected in the optical light curves of SSSs. However, the exact origin of such quasi-periodic observable…

太阳与恒星天体物理 · 物理学 2022-10-12 Weitao Zhao , Xiangcun Meng , Yingzheng Cui , Zheng-Wei Liu

Supersoft X-ray sources (SSSs) are characterized by persistent thermonuclear burning on the surfaces of white dwarfs (WDs).The standard model requires high mass transfer rates of $\sim 10^{-7}\, {\rm M_{\odot}}\,yr^{-1}$ from massive…

高能天体物理现象 · 物理学 2025-12-18 Weitao Zhao , Xiangcun Meng , Yingzhen Cui , Yunlang Guo

We give a global analysis of mass transfer variations in low-mass X-ray binaries and cataclysmic variables whose evolution is driven by the nuclear expansion of the secondary star. We show that limit cycles caused by irradiation of the…

天体物理学 · 物理学 2009-10-30 A. R. King , J. Frank , U. Kolb , H. Ritter

Observations of hundreds of supersoft x-ray sources (SSSs) in external galaxies have shed light on the diversity of the class and on the natures of the sources. SSSs are linked to the physics of Type Ia supernovae and accretion-induced…

宇宙学与河外天体物理 · 物理学 2015-05-14 Rosanne Di Stefano , Francis A. Primini , Jifeng Liu , Albert Kong , Brandon Patel

I review various phenomena associated with mass-accreting white dwarfs (WDs) in the view of supersoft X-ray sources. When the mass-accretion rate is low (\dot M_{acc} < a few \times 10^{-7} M_\sun yr^{-1}), hydrogen nuclear burning is…

太阳与恒星天体物理 · 物理学 2015-05-14 Mariko Kato

In some luminous supersoft X-ray sources (SSSs), hydrogen accretes onto the surface of a white dwarf at rates more-or-less compatible with steady nuclear burning. The white dwarfs in these systems therefore have a good chance to grow in…

天体物理学 · 物理学 2007-05-23 Rosanne Di Stefano

In a previous paper we investigated the energy transfer of massive stars to the interstellar medium as a function of time and the geometrical configuration of three massive stars via 3D-mesh-refining hydrodynamics simulations, following the…

星系天体物理 · 物理学 2014-07-02 Martin Krause , Roland Diehl , Hans Böhringer , Michael Freyberg , Daniel Lubos

Using the Modules for Experiments in Stellar Astrophysics code, we investigate the influences of irradiation on ultra-compact X-ray binary (UCXB) evolution. Although the persistent UCXBs have short orbital periods which result in high…

太阳与恒星天体物理 · 物理学 2017-10-04 Guoliang Lü , Chunhua Zhu , Zhaojun Wang , Hoernisa Iminniyaz

The highly luminous (> 10^37 erg s^-1) supersoft X-ray sources (SSS) are believed to be Eddington limited accreting white dwarfs undergoing surface hydrogen burning. The current paradigm for SSS involves thermally unstable mass transfer…

Supersoft X-ray sources are stellar objects which emit X-rays with temperatures of about 1 million Kelvin and luminosities well in excess of what can be produced by stellar coronae. It has generally been presumed that the objects in this…

Radiation of supersoft X-ray sources (SSS) dominates both the supersof X-ray and the far-UV domain. A fraction of their radiation can be reprocessed into the thermal nebular emission, seen in the spectrum from the near-UV to longer…

太阳与恒星天体物理 · 物理学 2015-06-18 Augustin Skopal

In the single degenerate scenario for the progenitors of type Ia supernovae (SNe Ia), a white dwarf rapidly accretes hydrogen- or helium-rich material from its companion star, and appears as a supersoft X-ray source. This picture has been…

高能天体物理现象 · 物理学 2015-06-18 Iminhaji Ablimit , Xiao-Jie Xu , Xiang-Dong Li

We report on the first results of a multi-wavelength approach to test the hypothesis that the X-ray emission from intermediate-mass stars is generated by late-type magnetically active companions. Our high spatial resolution observations of…

天体物理学 · 物理学 2007-05-23 B. Stelzer , N. Huelamo , S. Hubrig , G. Micela , H. Zinnecker , E. Guenther

We discuss two mechanisms that could result in an enhancement of the mass transfer rate during outbursts of dwarf novae and soft X-ray transients: the hot outer disc rim itself could heat the L1 point and scattered radiation by optically…

天体物理学 · 物理学 2009-11-13 M. Viallet , J. -M. Hameury

Supersoft X-ray sources (SSS) are thought to be accreting white dwarfs (WDs) in close binary systems, with thermonuclear burning on their surfaces. The SSS RX J0513.9-6951 in the Large Magellanic Cloud (LMC) exhibits cyclic variations…

高能天体物理现象 · 物理学 2025-02-05 A. Tavleev , V. F. Suleimanov , K. Werner , A. Santangelo

Pulsars are neutron stars that rotate rapidly. Most of the pulsars in binary systems tend to spin faster than those in isolation. According to binary evolution theory, radio pulsars in binary systems can have various types of companion…

高能天体物理现象 · 物理学 2024-10-02 Shunyi Lan , Xiangcun Meng

The deepest X-ray images of M31, obtained with XMM-Newton, are examined in this paper to derive spectral and statistical properties of the population of the softest X-ray sources. Classifying supersoft X-ray sources (SSS) with criteria…

天体物理学 · 物理学 2009-11-13 M. Orio

The light curves and spectra of many Type I and Type II supernovae (SNe) are heavily influenced by the interaction of the SN ejecta with circumstellar material (CSM) surrounding the progenitor star. The observed diversity shows that many…

太阳与恒星天体物理 · 物理学 2024-10-23 Andrea Ercolino

CAL 87 is one of the best known supersoft X-ray sources. However, the measured masses, orbital period and orbital period evolution of CAL 87 cannot be addressed by the standard thermal-timescale mass-transfer model for supersoft X-ray…

高能天体物理现象 · 物理学 2015-12-09 Iminhaji Ablimit , Xiang-Dong Li

Recent studies have suggested the possibility of significantly obscuring super-soft X-ray sources in relatively modest amounts of local matter lost from the binaries themselves. If correct, then this would have explained the paucity of…

高能天体物理现象 · 物理学 2015-09-16 Mikkel Nielsen , Marat Gilfanov
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