AC1 - Spectral and Temporal properties of Black Holes and neutron stars and the theoretical models |
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Speaker |
D'Ai, Antonino |
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Coauthors |
Cusumano, Giancarlo; La Parola, Valentina; Segreto, Alberto; Del Santo, Melania |
| Talk Title |
Cyclotron Lines in Accreting X-ray Binaries |
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Abstract |
In my talk I'll focus on two important open issues in the physics of accreting magnetized neutron stars: how the accretion flow settling on their surfaces affects the local topology of the magnetic field lines and how the secular evolution of the binary system depends on the dissipation rate of the NS intrinsic magnetic field. In the X-ray spectra of accreting NS binaries, the presence of the cyclotron resonant scattering features, indicates the intensity of the field in the region where the line is formed. This optically thick region can move in correlation, or anti-correlation, with the mass accretion rate, depending if a radiative shock is formed or not. In this way, cyclotron features probe the B-field intensity along the accretion column and, for spectra selected at the same level of luminosity but at different times, the field's evolution on longer time-scales. I will review the most recent results from spectroscopic studies on cyclotron line features, observed in a set of high- and low-mass X-ray binaries and which new results emerged. |
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Talk view |
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