Abstract
view Abstract Citations (59) References (26) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Hard X-Ray Spectra from Gap Accretion onto Neutron Stars Kluzniak, Wlodzimierz ; Wilson, James R. Abstract Weakly magnetized neutron stars undergoing disk accretion are found to emit copious hard X-rays if the marginally stable orbit lies outside the stellar surface. In this general relativistic picture (impossible in Newtonian gravity), the accretion disk terminates well outside the stellar surface. Accreting matter crosses the 'gap' between the disk and the star in free fall; it then strikes the neutron star surface at a shallow angle, creating a hot equatorial accretion belt with a temperature inversion. For accretion rates that are not too high, the fluid flowing through the gap is optically thin to X-rays escaping from the equatorial belt. The structure of the surface boundary layer in such stars may then be largely decoupled from that of the disk. A typical emergent spectrum is shown, which was obtained in a self-consistent manner by a one-plus-one-dimensional radiative transfer and hydro code; power-law emission extends up to about 200 keV. Publication: The Astrophysical Journal Pub Date: May 1991 DOI: 10.1086/186030 Bibcode: 1991ApJ...372L..87K Keywords: Accretion Disks; Neutron Stars; Stellar Mass Accretion; Stellar Spectra; X Ray Spectra; Coronas; Stellar Radiation; Astrophysics; ACCRETION; RELATIVITY; STARS: NEUTRON; X-RAYS: SPECTRA full text sources ADS | data products SIMBAD (3)
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
