On the Origin of Spectral Features Observed during Thermonuclear X-Ray Bursts and in the Aftermath Emission of a Long Burst from 4U 1820–30

We study 15 thermonuclear X-ray bursts from 4U 1820–30 observed with the Neutron Star Interior Composition Explorer (NICER). We find evidence of a narrow emission line at 1.0 keV and three absorption lines at 1.7, 3.0, and 3.75 keV, primarily around the photospheric radius expansion phase of most bu...

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Bibliographic Details

Published in:	The Astrophysical Journal
Main Authors:	Gaurava K. Jaisawal, Jérôme Chenevez, Tod E. Strohmayer, Hendrik Schatz, J. J. M. in ’t Zand, Tolga Güver, Diego Altamirano, Zaven Arzoumanian, Keith C. Gendreau
Format:	Article
Language:	English
Published:	IOP Publishing 2025-01-01
Subjects:	Accretion X-ray bursts Low-mass x-ray binary stars X-ray binary stars
Online Access:	https://doi.org/10.3847/1538-4357/adcc24