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Questions tagged [stellar-population]

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10 votes
3 answers
2k views

Are multiple stars actually more common than singles?

In the book by Neil Tyson & Michael A. Strauss & J. Richard Gott titled "Welcome to the Universe: An Astrophysical Tour" there is a sentence that starts: "Since more than half ...
Jimmy Bionic's user avatar
2 votes
0 answers
63 views

What was the life cycle of population III stars?

Is the life cycle of population III, II, and I roughly the same, save in timescale? Did III go through the same phases, or equivalents of them, for instance, was their an equivalent "main ...
blacktopshaman's user avatar
3 votes
1 answer
480 views

What is mass-weighted age?

This seems to be a common term used in the field of stellar populations and galaxy evolution, but I can't find a good definition besides the fact that it is different from light-weighted age (a term I ...
CuriousCosmos's user avatar
4 votes
1 answer
244 views

Earendel and HD1; identifying population 3 stars and galaxies

Will JWST be able to tell if Earendel, a 12.9 billion year old star, is a population 3 star? Or do we already know from the current Hubble observations that Earendel is a population 3 star? I've read ...
Sheldon's user avatar
  • 181
2 votes
0 answers
73 views

starting from SSP spectra to evaluate galaxy spectrum and observed mag

I know that the galaxy spectrum, namely the flux per unit wavelength versus the wavelength, is the sum of the Simple Stellar Population (SSP) spectra at a fixed redshift (e.g. similar to eq. 1 in ...
fslack's user avatar
  • 51
2 votes
1 answer
193 views

How can a very old star be formed among Population III stars?

After looking at some articles about old stars, (this, that, and this Wikipedia article), I thought about how such an old and small star could have formed. As the early universe had very massive, ...
WarpPrime's user avatar
  • 6,683