Work

Outburst characteristics of transient low-mass X-ray binary 4U 1608-52

Year: 2026

Type: article

Abstract: We present a detailed analysis of the long-term X-ray light curve of 4U 1608–52, focusing on fast-rising exponential-decay (FRED) outbursts, low-intensity states, and quiescent intervals. By calibrating the onset times of the outbursts, we identify three distinct classes for the FRED-type events: (i) the long-high outbursts, exceeding ~50 d in duration with peak count rates above ~40 cnt s-1; (ii) the short-medium outbursts, with durations of ~20 d and peak count rates of ~30-50 cnt s-1; and (iii) the short-low outbursts, also lasting ~20 d but reaching only ~20-30 cnt s-1 at peak. Furthermore, we examine the relation between preoutburst duration and the peak and integrated count rates of the upcoming outburst. We show that outbursts following longer quiescent periods tend to be more energetic.

Source: TURKISH JOURNAL OF PHYSICS

DOI: 10.55730/1300-0101.2801

Author: CAN GÜNGÖR

Language: English

Topic: Astrophysical Phenomena and Observations

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond

Funders: National Aeronautics and Space Administration, Türkiye Bilimsel ve Teknolojik Araştırma Kurumu, Goddard Space Flight Center, Japan Aerospace Exploration Agency, RIKEN

OpenAlex ID: W7131103698

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