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metallicity    
金属丰度; 金属特征; 金属性

金属丰度; 金属特徵; 金属性


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  • Are stars getting more metal-rich, less massive and shorter-lived with . . .
    The 4 5 billion year old Sun has a similar metallicity to stars that are being produced in the solar neighbourhood right now Let's also put this into context Even after about 12 billion years of star formation and stellar death, the metallicity of the interstellar medium still only consists of order 2% by mass of elements heavier than helium
  • astrophysics - How does metallicity affect stellar evolution? - Physics . . .
    The main sequence evolution of a solitary star depends most of all on its initial mass Other factors influencing its evolution are the initial metallicity, rotation and magnetism Question: how does the initial sun-like metallicity affect the evolution while the star is on the main sequence, (i) in a star of $1M_\odot$ initial mass
  • astrophysics - Stellar Activity Cycle versus Metallicity - Physics . . .
    A star with a higher metallicity will have a larger interior opacity and a thicker convection zone for a given mass The thickness of the convection zone is equally important in determining magnetic activity in stars that have an interface between a radiative inner region and convective envelope
  • Metal-rich star formation - Physics Stack Exchange
    At high enough metallicity, hydrogen atoms are separated mostly from each other by metal atoms, stopping fusion and causing collapse until fusion occurs OR degeneracy pressure supports the star So if the metallicity is very high, the way I see it, fusion cannot occur due the low concentration of reactant
  • Newest metallicity Questions - Physics Stack Exchange
    How does metallicity affect stellar evolution? The main sequence evolution of a solitary star depends most of all on its initial mass Other factors influencing its evolution are the initial metallicity, rotation and magnetism
  • Evolution of red dwarf stars - Physics Stack Exchange
    While low mass stars (initial mass approximately $0 1 M_\odot$ to $0 8 M_\odot$) are quite numerous, their evolution seems to draw relatively little attention
  • Why do astronomers call all elements heavier than helium metals?
    It has become far more important to say exactly what you mean by "metallicity" and I would say the default now is to assume that, in the absence of any other stated definition, "metallicity" refers to the relative abundance of iron-peak elements (Mn, Fe, Ni, Co)
  • galaxies - Population I and II stars - Physics Stack Exchange
    I have been thinking about the formation of the galaxy I can easily understand that old, low-metallicity stars are in the halo, but I'm missing something when it comes to the disk If slowly-rotating gas settled into the disk, formed stars, then did the disk at one time consist of Population II stars which have since exploded?
  • astrophysics - Why are stars made from hydrogen and helium and not . . .
    The universe is almost all hydrogen and helium (), so of course the stars are too You can get smaller clumps of heavier elements because they can stick together and form solids, but, as The_Sympathizer said, there's no natural way to separate out enough oxygen or whatever to put together a star
  • astronomy - How to explain the existence of heavier elements in . . .
    This matter returns to the nebula in which it was formed with a higher metallicity (more heavier elements) Note that the remnant of the star is either a neutron star or a black hole The lighter stars (bottom track) have very long life times (a few billion years) because they do not have enough mass to form much of anything past helium burning





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