What is the metallicity of our Sun?
The total metallicity of the Sun is given by Z⊙ = 0.0196 ± 0.0014. In the following, we will also make a distinction between “volatile” and “refractory” elements. Usually, volatile elements are those with a low condensation temperature, whereas refractory elements have a high condensation temperature.
Is the Sun high metallicity?
Unfortunately for the sun itself (and future life on Earth), low-metallicity stars burn fuel faster than high-metallicity stars, so our sun would die about a billion years sooner than we thought.
How do you calculate metallicity?
This value, denoted as [Fe/H], is calculated from the following logarithmic formula. For example, if the metallicity [Fe/H] = -1 then the abundance of heavy elements in the star is one tenth that found in the Sun; if [Fe/H] = +1, the heavy element abundance is 10 times the solar value.
How is metallicity defined?
Metallicity measures the abundance of the elements heavier than hydrogen and helium (such as carbon, oxygen, iron, …). In stellar astrophysics, metallicity usually refers to the abundance of iron and is defined as the iron-to-hydrogen ratio.
What is metallicity in chemistry?
Metallicity is the property of a metal to conduct electricity or heat.
What stellar metallicity tells us?
Relationship between stellar metallicity and planets A star’s metallicity measurement is one parameter that helps determine whether a star may have a giant planet, as there is a direct correlation between metallicity and the presence of a giant planet.
Is the Sun a population 1 star?
The Sun is considered population I, a recent star with a relatively high 1.4% metallicity. Note that astrophysics nomenclature considers any element heavier than helium to be a “metal”, including chemical non-metals such as oxygen.
What star has the highest metallicity?
the Sun
These youngest stars, including the Sun, therefore have the highest metal content, and are known as population I stars.
What is metallicity chemistry?
How does metallicity affect stellar evolution?
It is well known that metallicity plays an important role in the evolution of massive stars. First, it affects directly the luminosity and effective temperature of massive stars (e.g. Hurley, Pols & Tout 2000; Tumlinson & Shull 2000; Baraffe, Heger & Woosley 2001; Bromm, Kudritzki & Loeb 2001).
Where are population 3 stars found?
Population III stars Indirect evidence for their existence has been found in a gravitationally lensed galaxy in a very distant part of the universe. Their existence may account for the fact that heavy elements – which could not have been created in the Big Bang – are observed in quasar emission spectra.