What is Dex in astronomy?
The term dex (for decimal exponent) refers to the exponent of a number in scientific notation, and has come to be used like a unit that specifies a number’s order-of-magnitude. For example, 100 could be described as 2 dex, or two numbers that differ by a factor of 1000 could be said to differ by 3 dex.
Is Dex a number?
The idea of a dex is straightforward—a dex is simply an order of magnitude. More formally, a difference of x dex is a change by a factor of 10x. (Although the dex is almost always used in relation to some other quantity, it can in principle be used to represent a unitless number.
What is Dex metallicity?
The unit often used for metallicity is the dex, contraction of “decimal exponent”. By this formulation, stars with a higher metallicity than the Sun have a positive common logarithm, whereas those more dominated by hydrogen have a corresponding negative value.
How do you measure metallicity?
A second way to characterize metallicity is through the alpha-to-iron ratio, [ /Fe], which involve elements built by combining helium nuclei, such as Oxygen, Silicon, Neon, etc.
What does the name DeX mean?
right-handed
Dex is a boy’s name meaning “right-handed”, “fortunate”, or “one who dyes”. It is a variant of the Latin and Old English name Dexter.
What does DeX mean in Latin?
as a boys’ name. The name Dex means “right-handed, fortunate; woman who dyes”. Dex is an alternate form of Dexter (Latin, Old English): originally from Greek dexi meaning “worship”. STARTS WITH De- ASSOCIATED WITH fortunate (blessed)
What is metallicity astronomy?
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 astronomy?