Thermonuclear burst observations for model comparisons: a reference sample

Abstract

We present a sample of observations of thermonuclear (type-I) X-ray bursts, selected for comparison with numerical models. Provided are examples of four distinct cases of thermonuclear ignition: He-ignition in mixed H/He fuel (case 1 of Fujimoto et al. 1981); He-ignition in pure He fuel, following exhaustion of accreted H by steady burning (case 2); ignition in (almost) pure He accumulated from an evolved donor in an ultracompact system; and an example of a superburst, thought to arise from ignition of a layer of carbon fuel produced as a by-product of more frequent bursts. For regular bursts, we measured the recurrence time and calculated averaged burst profiles from RXTE observations. We have also estimated the recurrence time for pairs of bursts, including those observed during a transient outburst modelled using a numerical ignition code. For each pair of bursts we list the burst properties including recurrence time, fluence and peak flux, the persistent flux level (and inferred accretion rate) as well as the ratio of persistent flux to fluence. In the accompanying material we provide a bolometric lightcurve for each burst, determined from time-resolved spectral analysis. Along with the inferred or adopted parameters for each burst system, including distance, surface gravity, and redshift, these data are suggested as a suitable test cases for ignition models.

14 pages, 3 figures, 2 tables and associated data provided on-line; accepted by PASA

References in corpus (10)

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• Anisotropy of X-ray bursts from neutron stars with concave accretion disks
• The influence of accretion rate and metallicity on thermonuclear bursts: predictions from KEPLER models
• Characterizing the Evolving X-Ray Spectral Features During a Superburst from 4U 1636-536
• Deviations from the Flux-Recurrence Time Relationship in GS 1826-238: Potential Transient Spectral Changes
• Carbon Synthesis in Steady-State Hydrogen and Helium Burning On Accreting Neutron Stars

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