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2023ApJ...947...81Y - Astrophys. J., 947, 81 (2023/April-3)

Revealing the Spectral State Transition of the Clocked Burster, GS 1826-238, with NuSTAR StrayCats.

YUN S.B., GREFENSTETTE B.W., LUDLAM R.M., BRUMBACK M.C., BUISSON D.J.K., MASTROSERIO G. and PIKE S.N.

Abstract (from CDS):

We present the long-term analysis of GS 1826-238, a neutron star X-ray binary known as the Clocked Burster, using data from NuSTAR StrayCats. StrayCats, a catalog of NuSTAR stray light data, contains data from bright, off-axis X-ray sources that have not been focused by the NuSTAR optics. We obtained stray light observations of the source from 2014-2021, reduced and analyzed the data using nustar-gen-utils Python tools, demonstrating the transition of the source from the island atoll state to a banana branch. We also present the light-curve analysis of Type I X-ray bursts from the Clocked Burster and show that the bursts from the banana/soft state are systematically shorter in duration than those from the island/hard state and have a higher burst fluence. From our analysis, we note an increase in the mass accretion rate of the source, and a decrease in burst frequency with the transition.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Neutron stars - Compact objects - Low-mass x-ray binary stars - X-ray astronomy

Simbad objects: 2

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