Volume 555, July 2013
|Number of page(s)||5|
|Published online||10 July 2013|
Escape, capture, and levitation of matter in Eddington outbursts
Physics DepartmentGothenburg University,
e-mail: firstname.lastname@example.org, email@example.com
2 Nicolaus Copernicus Astronomical Center, ul. Bartycka 18, 00-716 Warszawa, Poland
3 Institute of Micromechanics and Photonics, ul. św A. Boboli 8, 02-525 Warszawa, Poland
Accepted: 26 May 2013
Context. An impulsive increase in luminosity by one half or more of the Eddington value will lead to ejection of all optically thin plasma from Keplerian orbits around the radiating star, if gravity is Newtonian and the Poynting-Robertson drag is neglected. Radiation drag may bring some particles down to the stellar surface. On the other hand, general relativistic calculations show that gravity may be balanced by a sufficiently intense radiation field at a certain distance from the star. Aims. We investigate the motion of test particles around highly luminous stars to determine conditions under which plasma may be ejected from the system. Results. In Einstein’s gravity, if the outburst is close to the Eddington luminosity, all test particles orbiting outside an “escape sphere” will be ejected from the system, while all others will be captured from their orbits onto the surface of another sphere, which is well above the stellar surface, and may even be outside the escape sphere, depending on the value of luminosity. Radiation drag will bring all the captured particles to rest on this “Eddington capture sphere”, where they will remain suspended in an equilibrium state as long as the local flux of radiation does not change and remains at the effective Eddington value.
Key words: stars: neutron / stars: winds, outflows / X-rays: binaries / scattering / accretion, accretion disks
© ESO, 2013
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.