What does metallicity of a star refer to?

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.

How is metallicity of a star measured?

Astronomers can estimate metallicities through measured and calibrated systems that correlate photometric measurements and spectroscopic measurements (see also Spectrophotometry).

What is the metallicity of a galaxy?

Metallicity is, therefore, one of the key physical properties of galaxies, and understanding the processes that regulate the exchange of metals between stars, cold interstellar gas and diffuse surrounding gas can help us understand the physical processes that govern galaxy evolution in general.

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 age metallicity relation?

The age-metallicity relation (AMR) is a fundamental observational constraint for understanding how the Galactic disc formed and evolved chemically in time.

What is solar metallicity?

0.012Sun / Metallicity

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.

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.

What is metallicity chemistry?

Metallicity is the property of a metal to conduct electricity or heat.

Does the Sun have high metallicity?

These youngest stars, including the Sun, therefore have the highest metal content, and are known as Population I stars. Across the Milky Way, metallicity is higher in the galactic centre and decreases as one moves outwards.