Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pasj...53..105h&link_type=abstract
Publications of the Astronomical Society of Japan, vol.53, no. 1, p. 105-109.
Astronomy and Astrophysics
Astronomy
5
Accretion, Accretion Disks, Radiation Mechanisms, Superdisks, X-Rays: Stars
Scientific paper
We examine Hoyle-Lyttleton accretion onto superdisks, where the mass-accretion rate greatly exceeds the critical one and the luminosity is of the order of the Eddington one. Hoyle-Lyttleton accretion onto a luminous accretion disk is drastically changed from the spherical case, due to the non-spherical nature of disk radiation fields. In edge-on accretion, for example, mass accretion does not cease at Γ=1, but continues in the regime of Γ >= 1, where Γ 1 is the disk luminosity normalized by the Eddington one. We found that Hoyle-Lyttleton accretion onto superdisks is not a simple extension of that onto standard accretion disks, where the mass-accretion rate gradually decreases with increasing Γ. Instead, in the case of a superdisk, the mass-accretion rate increases with increasing Γ. This is due to a geometrical shadowing effect. That is, in contrast to the infinitesimally-thin standard disk, the superdisk has finite thickness. As Γ increases, the relative thickness increases and the shadowing region in the equatorial direction increases. We also briefly discuss the canonical luminosity in the steady state and the system evolution.
Fukue Jun
Hanamoto Keishi
Ioroi Masayuki
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