A dataset provided by the European Space Agency

Proposal ID 0820022
Obs ID 08200220001
Title Thermonuclear bursts of the Slow Burster
Download Data Associated to the proposal https://isla.esac.esa.int/tap/download/bundle?format=ascii_curl&product_id=prop_id:0820022
DOI https://doi.org/10.57780/esa-sbje3n3
Author Misanovic
Abstract Thermonuclear bursts in systems accreting pure helium reveal the structure of the neutron star (NS) interiors. In the absence of heating from steady H-burning between bursts, the burst properties (the burst recurrence times versus the accretion rate) are much more sensitive to the thermal properties and processes in the NS crust and core. Interestingly, burst ignition models predict significantly longer burst recurrence times than observed for such sources. Our recent analysis of one such source, 4U 1728-34, confirms this discrepancy, suggesting the fractional covering of the accreted fuel on the NS surface as a possible solution. However, a large scatter in our data indicates that other processes, such as steady burning of He and fuel storage and mixing due to shear instabilities, may also be important. To distinguish between these possibilities, the precise accretion rate measurements in a wide multi-instrument energy band are crucial, as they will enable to detect additional both soft and hard spectral components outside the sensitivity band of individual detectors. We propose to observe 4U~1728-34 with INTEGRAL and XMM-Newton simultaneously, in order to measure the burst recurrence time and X-ray flux (and hence the accretion rate) in a much broader band than previous observations. The results of this study will have profound consequences for facilitating future burst ignition modelling.
Publications
Temporal Coverage 2011-08-11T22:45:40Z / 2011-08-15T07:40:13Z
Version 1.0
Mission Description The INTEGRAL (International Gamma-Ray Astrophysics Laboratory) mission, launched by the European Space Agency (ESA) on October 17, 2002, was designed to study high-energy phenomena in the universe. INTEGRAL was operating until february 2025 and it was equipped with three high-energy instruments: the Imager on Board the INTEGRAL Satellite (IBIS), the Spectrometer on INTEGRAL (SPI), and the JEM-X (Joint European Monitor for X-rays). Its Optical Monitoring Camera (OMC) provided optical V-band magnitude measurements, complementing the high-energy observations.
Creator Contact https://www.cosmos.esa.int/web/integral/helpdesk
Date Published 2025-03-25T09:54:36Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, Misanovic, 2025, 'Thermonuclear bursts of the Slow Burster', 1.0, European Space Agency, https://doi.org/10.57780/esa-sbje3n3