Page "HE0107-5240" Paragraph 9

80 % of the mass of the Sun.

It is one of the most metal-poor stars known in our Galaxy, with a metallicity = ; i. e. it has just 1 / 200, 000 of the metal that the Sun has.

Because of its very low metallicity, it is believed to be one of the earliest Population II stars to have formed.

If so, then it is also very old, with an age of roughly 13 billion years.

Because the star is not completely metal-free, it does not belong to the first generation of stars ( the hypothetical Population III ).

These stars converted the pristine hydrogen, helium, and lithium formed by the Big Bang into heavier elements, such as carbon, oxygen, and metals.