منابع مشابه
Dispersal of Gaseous Circumstellar Discs around High-Mass Stars
We study the dispersal of a gaseous disc surrounding a central high-mass stellar core once this circumstellar disc becomes fully ionized. If the stellar and surrounding EUV and X-ray radiations are so strong as to rapidly heat up and ionize the entire circumstellar disc as further facilitated by disc magnetohydrodynamic (MHD) turbulence, a shock can be driven to travel outward in the fully ioni...
متن کاملSpectral modeling of gaseous metal disks around DAZ white dwarfs
We report on our attempt for the first non-LTE modeling of gaseous metal disks around single DAZ white dwarfs recently discovered by Gänsicke et al. and thought to originate from a disrupted asteroid. We assume a Keplerian rotating viscous disk ring composed of calcium and hydrogen and compute the detailed vertical structure and emergent spectrum. We find that the observed infrared Ca ii emissi...
متن کاملA gaseous metal disk around a white dwarf.
The destiny of planetary systems through the late evolution of their host stars is very uncertain. We report a metal-rich gas disk around a moderately hot and young white dwarf. A dynamical model of the double-peaked emission lines constrains the outer disk radius to just 1.2 solar radii. The likely origin of the disk is a tidally disrupted asteroid, which has been destabilized from its initial...
متن کاملNew 13 CO observations towards the Keplerian gaseous disk around
We present new high angular resolution observations of the 13 CO 1→0 rotational line towards the HBe star R Mon, obtained with the IRAM Bure In-terferometer, along with the previous results in the observed transitions 12 CO 1→0 and 2→1. We have used a flat disk model to fit the 12 CO 1→0 and 2→1, and 13 CO 1→0 emission, in a strip perpendicular to the outflow axis. The model assumes standard ab...
متن کامل4 FORMALITY OF k - CONNECTED SPACES IN 4 k + 3 AND 4 k + 4 DIMENSIONS GIL
Using the concept of s-formality we are able to extend the bounds of a Theorem of Miller and show that a compact k-connected (4k + 3)or (4k + 4)-manifold with bk+1 = 1 is formal. We study k connected n-manifolds, n = 4k + 3, 4k + 4, with a hard Lefschetzlike property and prove that in this case if bk+1 = 2, then the manifold is formal, while, in 4k+3-dimensions, if bk+1 = 3 all Massey products ...
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ژورنال
عنوان ژورنال: Journal de Physique III
سال: 1994
ISSN: 1155-4320,1286-4897
DOI: 10.1051/jp3:1994157