Revealing the Spectral State Transition of the Clocked Burster, GS 1826-238, with NuSTAR StrayCats
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 obtain...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/acb689 |
| _version_ | 1827827356766568448 |
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| author | S. B. Yun B. W. Grefenstette R. M. Ludlam M. C. Brumback D. J. K. Buisson G Mastroserio S. N. Pike |
| author_facet | S. B. Yun B. W. Grefenstette R. M. Ludlam M. C. Brumback D. J. K. Buisson G Mastroserio S. N. Pike |
| author_sort | S. B. Yun |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-12T03:25:18Z |
| format | Article |
| id | doaj.art-b0f83c1a03614c2892d3c732bb259f66 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T03:25:18Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-b0f83c1a03614c2892d3c732bb259f662023-09-03T13:40:29ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-0194728110.3847/1538-4357/acb689Revealing the Spectral State Transition of the Clocked Burster, GS 1826-238, with NuSTAR StrayCatsS. B. Yun0B. W. Grefenstette1https://orcid.org/0000-0002-1984-2932R. M. Ludlam2https://orcid.org/0000-0002-8961-939XM. C. Brumback3https://orcid.org/0000-0002-4024-6967D. J. K. Buisson4https://orcid.org/0000-0002-5341-6929G Mastroserio5https://orcid.org/0000-0003-4216-7936S. N. Pike6https://orcid.org/0000-0002-8403-0041Department of Astronomy, The University of Michigan , 1085 S. University Avenue, Ann Arbor, MI, 48109, USA ; bwgref@srl.caltech.eduCahill Center for Astronomy and Astrophysics, California Institute of Technology , Pasadena, CA 91125, USADepartment of Physics & Astronomy, Wayne State University , 666 West Hancock Street, Detroit, MI 48201, USADepartment of Astronomy, The University of Michigan , 1085 S. University Avenue, Ann Arbor, MI, 48109, USA ; bwgref@srl.caltech.eduIndependentINAF-Osservatorio Astronomico di Cagliari , via della Scienza 5, I-09047 Selargius (CA), ItalyCenter for Astrophysics and Space Sciences, University of California , San Diego, CA 92093, USAWe 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.https://doi.org/10.3847/1538-4357/acb689Neutron starsCompact objectsLow-mass x-ray binary starsX-ray astronomy |
| spellingShingle | S. B. Yun B. W. Grefenstette R. M. Ludlam M. C. Brumback D. J. K. Buisson G Mastroserio S. N. Pike Revealing the Spectral State Transition of the Clocked Burster, GS 1826-238, with NuSTAR StrayCats The Astrophysical Journal Neutron stars Compact objects Low-mass x-ray binary stars X-ray astronomy |
| title | Revealing the Spectral State Transition of the Clocked Burster, GS 1826-238, with NuSTAR StrayCats |
| title_full | Revealing the Spectral State Transition of the Clocked Burster, GS 1826-238, with NuSTAR StrayCats |
| title_fullStr | Revealing the Spectral State Transition of the Clocked Burster, GS 1826-238, with NuSTAR StrayCats |
| title_full_unstemmed | Revealing the Spectral State Transition of the Clocked Burster, GS 1826-238, with NuSTAR StrayCats |
| title_short | Revealing the Spectral State Transition of the Clocked Burster, GS 1826-238, with NuSTAR StrayCats |
| title_sort | revealing the spectral state transition of the clocked burster gs 1826 238 with nustar straycats |
| topic | Neutron stars Compact objects Low-mass x-ray binary stars X-ray astronomy |
| url | https://doi.org/10.3847/1538-4357/acb689 |
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