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@INPROCEEDINGS{Stiele:1033999,
      author       = {Stiele, Holger and Kong, Albert},
      title        = {{E}volution of {QPO}s and spectral properties during
                      {X}-ray binary outburst},
      reportid     = {FZJ-2024-06832},
      year         = {2024},
      abstract     = {Low-mass black hole X-ray binaries are mainly transient
                      systems. From time to time they go into outbursts, which
                      usually last from a few weeks to several months and during
                      which their luminosity changes by several orders of
                      magnitude. During the outburst, these systems pass through
                      different states with distinct spectral and short-term
                      variability properties. NICER enables us to closely follow
                      the evolution of these outbursts on a variety of time scales
                      with high-sensitivity data. Based on these observations, we
                      were able to study in detail the evolution of certain
                      variability features, so-called quasi-periodic oscillations
                      (QPOs), in different outburst states and during state
                      transition. Our investigations allowed us to gain further
                      insights into the evolution of QPOs and to follow the
                      emergence and disappearance of the different types of these
                      oscillations in more detail. We analysed not only
                      power-density spectra, but also the evolution of energy
                      spectra. Based on theoretical modelling, we determined the
                      radii of the different components of X-ray binaries and
                      followed their evolution during outburst.We will present the
                      results of our studies of the evolution of the timing and
                      spectral properties in outbursts of GX 339-4 and Swift
                      J1727.7-1613. We will discuss them in light of different QPO
                      models and what they teach us about the accretion geometry
                      of X-ray binaries.},
      month         = {Jul},
      date          = {2024-07-29},
      organization  = {Joint NICER/IXPE Workshop 2024,
                       Washington D.C. (USA), 29 Jul 2024 - 1
                       Aug 2024},
      subtyp        = {After Call},
      cin          = {JSC},
      cid          = {I:(DE-Juel1)JSC-20090406},
      pnm          = {5111 - Domain-Specific Simulation $\&$ Data Life Cycle Labs
                      (SDLs) and Research Groups (POF4-511) / Big Bang to Big Data
                      - B3D [NRW-Cluster für datenintensive Radioastronomie]
                      (PROFILNRW-2020-038B)},
      pid          = {G:(DE-HGF)POF4-5111 / G:(DE-Juel-1)PROFILNRW-2020-038B},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/1033999},
}