Bestimmung fundamentaler Parameter von Neutronensternen durch spektrale Modellierung von Röntgen-Burster
Zusammenfassung der Projektergebnisse
We achieved about 70% of our initial aims concerning the development of the cooling tail method for determination of masses and radii of X-ray bursting neutron stars in Low Mass X-ray Binaries. We additionally followed two new tasks which were not planned at the outset of the project because of new developments in the field. During the course of the project, we focused on a new idea, the determination of white dwarf masses and precise mass accretion rates in intermediate polars based on our grid of models of hard X-ray spectra of these objects. This kind of robust information is important for understanding of the evolution of close binary systems. Performing of this work became highly topical after new observations of the NuSTAR observatory and Gaia DR2. Another new problem that we worked on is connected to the spectral states of low-luminous accreting X-ray pulsars. We concluded that the spectra of the objects at this spectral state are formed in the upper hot layers of NS atmospheres heated by the accreting flow. We note that this idea is closely connected with the planned (and performed) work concerning accretion heated NS atmospheres. The respective publications had a high impact, achieving more than 45 citations within about two years.
Projektbezogene Publikationen (Auswahl)
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2018: Accretion heated atmospheres of X-ray bursting neutron stars. A&A, 619, A114
Suleimanov, V.F., Poutanen, J., Werner, K.
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2018: Evidence for the Photoionization Absorption Edge in a Photospheric Radius Expansion X-Ray Burst from GRS 1747312 in Terzan 6. ApJ, 866, 53
Li, Z., Suleimanov, V.F., Poutanen, J. Salmi, T., Falanga, M., Nättilä, J., Xu, R.
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2018: Testing the Equation of State with Electromagnetic Observations, in The Physics and Astrophysics of Neutron Stars, Astrophysics and Space Science Library, Springer Nature Switzerland AG, 457, 185
Degenaar, N., Suleimanov, V.
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2019: Hard X-ray view on intermediate polars in the Gaia era. MNRAS, 482, 3622
Suleimanov, V.F., Doroshenko, V., Werner, K.
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2020: Magnetospheric return-current-heated atmospheres of rotation-powered millisecond pulsars. A&A, 641, A15
Salmi, T., Suleimanov, V.F., Nättilä, J., Poutanen, J.
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2020: Observational appearance of rapidly rotating neutron stars. X-ray bursts, cooling tail method, and radius determination. A&A, 639, A33
Suleimanov, V.F., Poutanen, J., Werner, K.
