منابع مشابه
Low-frequency Atlantic sea level variability
The control run of the Hadley Centre-coupled climate model (HadCM3) is used to establish the sources of multidecadal/ centennial sea level (SL) variations in the northwest Atlantic. It is shown that variations in the sea level for the largest part of this area are related to variations in the thermohaline structure of the upper (c 500 m) part of the ocean. Temperature variations dominate steric...
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Three component models of the IMF are made to consider possible origins for the observed relative variations in the numbers of brown dwarfs, solar-to-intermediate mass stars, and high mass stars. The differences between the IMFs observed for clusters, field, and remote field are also discussed. Three distinct physical processes that should dominate the three stellar mass regimes are noted. The ...
متن کاملLow-order stellar dynamo models
Stellar magnetic activity – which has been observed in a diverse set of stars including the Sun – originates via a magnetohydrodynamic dynamo mechanism working in stellar interiors. The full set of magnetohydrodynamic equations governing stellar dynamos is highly complex, and so direct numerical simulation is currently out of reach computationally. An understanding of the bifurcation structure,...
متن کاملStellar Evolution at Low Metallicity
Massive stars played a key role in the early evolution of the Universe. They formed with the first halos and started the re-ionisation. It is therefore very important to understand their evolution. In this review, we first recall the effect of metallicity (Z) on the evolution of massive stars. We then describe the strong impact of rotation induced mixing and mass loss at very low Z. The strong ...
متن کاملLow Stellar Obliquities in Compact Multiplanet Systems
We measure the sky-projected stellar obliquities (λ) in the multiple-transiting planetary systems KOI-94 and Kepler-25, using the Rossiter-McLaughlin effect. In both cases the host stars are well-aligned with the orbital planes of the planets. For KOI-94 we find λ = −11±11◦, confirming a recent result by Hirano and coworkers. Kepler-25 was a more challenging case because the transit depth is un...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1993
ISSN: 0252-9211
DOI: 10.1017/s0252921100018662