Zobrazeno 1 - 10
of 329
pro vyhledávání: '"Vauclair S"'
Publikováno v:
EPJ Web of Conferences, Vol 152, p 06007 (2017)
Atomic diffusion, including the effects of radiative accelerations on individual elements, leads to important variations of the chemical composition inside stars. The accumulation of important elements in specific layers leads to a local increase of
Externí odkaz:
https://doaj.org/article/00d564a1e93d4a07870d04499dd49d66
A non negligible fraction of white dwarf stars show the presence of heavy elements in their atmospheres. The most accepted explanation for this contamination is the accretion of material coming from tidally disrupted planetesimals, which form a debri
Externí odkaz:
http://arxiv.org/abs/2109.11370
Publikováno v:
A&A 646, A160 (2021)
The formation and evolution of light elements in the Universe act as important cosmological constraints. It has long been assumed that the oldest stars of the Galaxy display the primordial Li abundance in their outer layers, although studies of stell
Externí odkaz:
http://arxiv.org/abs/2101.01522
Publikováno v:
EPJ Web of Conferences, Vol 11, p 02005 (2011)
Photospheric stellar activity (i.e. dark spots or bright plages) might be an important source of noise and confusion in the radial-velocity (RV) measurements. Radial-velocimetry planet search surveys as well as follow-up of photometric transit survey
Externí odkaz:
https://doaj.org/article/c16f94090f9c4a3594b4ee1288aabc9b
White dwarfs are compact objects with atmospheres containing mainly light elements, hydrogen or helium. Because of their surface high gravitational field, heavy elements diffuse downwards in a very short timescale compared to the evolutionary timesca
Externí odkaz:
http://arxiv.org/abs/1812.09405
Publikováno v:
A&A 601, A127 (2017)
A precision of order one percent is needed on the parameters of exoplanet-hosts stars in order to correctly characterize the planets themselves. This will be achieved by asteroseismology. It is important in this context to test the influence on the d
Externí odkaz:
http://arxiv.org/abs/1702.03170
Publikováno v:
A&A 601, A13 (2017)
A large fraction of white dwarf stars shows photospheric chemical composition polluted by heavy elements accreted from a debris disk. Such debris disks result from the tidal disruption of rocky planetesimals which had survived to whole stellar evolut
Externí odkaz:
http://arxiv.org/abs/1612.09320
Autor:
Vauclair, S.
The interdependence of microscopic (atomic) and macroscopic (hydrodynamic) processes inside stars and their consequences for stellar structure and evolution were recognized by Jean-Paul Zahn several decades ago. He was a pioneer in that respect, disc
Externí odkaz:
http://arxiv.org/abs/1612.07654
Publikováno v:
A&A 589, A140 (2016)
Aims. Atomic diffusion, including the effect of radiative accelerations on individual elements, leads to important variations of the chemical composition inside the stars. The accumulation in specific layers of the elements, which are the main contri
Externí odkaz:
http://arxiv.org/abs/1604.01241
Publikováno v:
A&A 570, A58 (2014)
Fingering (thermohaline) convection has been invoked for several years as a possible extra-mixing which could occur in Red Giant stars due to the modification of the chemical composition induced by nuclear reactions in the hydrogen burning zone. Rece
Externí odkaz:
http://arxiv.org/abs/1409.4216