Probing the X-ray Spectral and Timing Behaviour of the High-Mass X-ray Binaries EXO 2030+375 and Vela X-1

Du, Yujia

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Probing the X-ray Spectral and Timing Behaviour of the High-Mass X-ray Binaries EXO 2030+375 and Vela X-1

Du, Yujia

Dateien:	Dissertation_YujiaDu.pdf 21.1 MB PDF Description: Main article

URI:	http://hdl.handle.net/10900/175471 http://nbn-resolving.org/urn:nbn:de:bsz:21-dspace-1754719 http://nbn-resolving.org/urn:nbn:de:bsz:21-dspace-1754719 http://dx.doi.org/10.15496/publikation-116796
Dokumentart:	PhDThesis
Date:	2026-02-10
Source:	Parts of this thesis have been previously published in: Du, Y. et al., Astronomy & Astrophysics, 2025, DOI: https://doi.org/10.1051/0004-6361/202451634; Malacaria et al., Astronomy & Astrophysics, 2023, DOI: https://doi.org/10.1051/0004-6361/202346581; Du, Y. et al., 2025, Astronomy & Astrophysics, accepted.
Language:	English
Faculty:	7 Mathematisch-Naturwissenschaftliche Fakultät 7 Mathematisch-Naturwissenschaftliche Fakultät
Department:	Physik
Advisor:	Santangelo, Andrea (Prof. Dr.)
Day of Oral Examination:	2026-01-27
DDC Classifikation:	520 - Astronomy and allied sciences 530 - Physics
Keywords:	Neutron star , Pulsar , Akkretion
Other Keywords:	Neutronenstern X-ray binaries
License:	https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode.de https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode.en http://tobias-lib.uni-tuebingen.de/doku/lic_mit_pod.php?la=de http://tobias-lib.uni-tuebingen.de/doku/lic_mit_pod.php?la=en
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Abstract:

This work presents spectral and timing studies of two accreting X-ray pulsars, the Be/X-ray binary EXO 2030+375 and the wind-fed system Vela X-1, based on multi-mission X-ray observations. For EXO 2030+375, luminosity- and energy-dependent pulse-profile evolution and spectral behavior reveal transitions between different accretion regimes during outbursts. For Vela X-1, long-term monitoring and pulse-to-pulse analyses show complex evolution of cyclotron line energies, including a recent transient increase of the harmonic line, indicating changes in the magnetic-field configuration.