HEASA 2024

Session

X-Ray and Gamma-Ray Binaries

4 Oct 2024, 11:00

Conveners

X-Ray and Gamma-Ray Binaries

• Anton Dmytriiev (North-West University)

5. A spectral and timing study of MAXI J1820+070 during it's outburst

Kyle Solomons (University of Cape Town, South African Astronomical Observatory)

04/10/2024, 11:00

X-Ray and Gamma-Ray Binaries

Contributed Talk

Black Hole X-ray binaries (BHXRBs) represent a unique class of astrophysical systems where a stellar-mass black hole accretes matter from a companion star via accretion disks. The accretion disk emits X-ray and UV because of the radiative losses. The transfer of matter can occur through continuous donor supply or episodic capturing of material from stellar winds, leading to sudden enhancements...

21. Multi-wavelength Monitoring of Two Gamma-ray Binaries: 1FGLJ1018.6-5856 and LMC P3

Masekaisha Andries Mathiba (University of Cape Town)

04/10/2024, 11:15

X-Ray and Gamma-Ray Binaries

Contributed Talk

Gamma-ray binaries are a subclass of high-mass binary stellar binary systems consisting of a compact object (neutron star/ black hole) and an O- or B-type stellar companion. They emit across the entire electromagnetic spectrum, with a characteristic energy spectrum that peaks in the gamma-ray energy range. Currently, only ten such systems have been discovered.

1GLJ1018.6-5856 and LMC P3...

13. A record-breaking energetic dwarf nova outburst hosting a massive white dwarf

Yusuke Tampo (South African Astronomical Observatory)

04/10/2024, 11:30

X-Ray and Gamma-Ray Binaries

Contributed Talk

Some accreting white dwarf (WD) systems show dwarf nova (DN) outbursts. These are characterized by an outburst amplitude of a few magnitudes and a duration of days to weeks in optical bands, as explained in the thermal instability model. We report the detailed optical and X-ray observations of the 2021 outburst in MASTER OT J030227.28+191754.5 (hereafter J0302). The X-ray spectrum at outburst...

26. The Modelling of Accretion Driven Plasma Instabilities in the Accretion Columns of Polars Using PLUTO

John-Paul Khumalo (University of the Free State)

04/10/2024, 11:45

Transients

Contributed Talk

This project explores the complex emission patterns and instabilities in the post-shock accretion columns (PSACs) of magnetic cataclysmic variables (mCVs). Utilizing the PLUTO code, the study integrates bremsstrahlung and cyclotron radiation mechanisms to simulate these phenomena under various initial conditions, such as white dwarf mass and magnetic field strengths. The findings reveal...