منابع مشابه
How dusty is Centauri? Excess or non-excess over the infrared photospheres of main-sequence stars
Context. Debris discs around main-sequence stars indicate the presence of larger rocky bodies. The components of the nearby, solar-type binary αCentauri have higher than solar metallicities, which is thought to promote giant planet formation. Aims. We aim to determine the level of emission from debris around the stars in the αCen system. This requires knowledge of their photospheres. Having alr...
متن کاملDusty Tori of Seyfert Nuclei Probed by the Water Vapor Maser Emission: How Large Are the Dusty
Geometrical and physical properties of dusty tori of Seyfert nuclei probed by the water vapor maser emission at 22 GHz are discussed. We assume that the dusty torus has a simple cylindrical form and the maser emission can be detected only when we observe the torus from almost edge-on views. The observed low frequency of occurrence of the water vapor maser emission (less than 10 percent) suggest...
متن کاملRevised masses of α Centauri
With the precise radial velocities lately published (Murdoch et al., 1993), a simultaneous least-squares adjustment of all visual and spectroscopic observations of the α Centauri system is now possible and likely to yield some accurate information. Such an orbit determination leads to a mass ratio in agreement with the astrometric estimate of Kamper & Wesselink (1978) but yields upward revision...
متن کاملDusty Plasma Liquids
The dusty plasma liquid formed by micro-meter sized particles negatively charged and suspended in a low pressure discharge background is a good candidate to study the generic spatio-temporal dynamical behaviors at the kinetic level through direct optical video-microscopy, because of the sub-mm interparticle spacing and the slow time scale. In this paper, starting from the basic picture of the a...
متن کاملA less dusty future?
[1] Atmospheric desert dust is potentially highly sensitive to changes in climate, carbon dioxide and human land use. In this study we use 6 different scenarios of the processes responsible for changes in source areas and explore changes in desert dust loading in pre-industrial and future climates, although all the scenario results are likely to be sensitive to the climate model simulations use...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2014
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201321887