The disk appears to be composed of stars of all ages, whereas the halo contains only very old and metal-poor stars.
At the time of its discovery, HIP 13044 b was found to orbit the most metal-poor star discovered to date.
Like most halo stars, it has a low abundance of elements other than hydrogen and helium-what astronomers term a metal-poor star.
It is a metal-poor star with metallicity as low as 35% that of our Sun and its age is 9.49 billion years.
His main interests are stellar atmospheres, galactic chemical evolution and metal-poor stars.
HD 140283 is a metal-poor subgiant star about 190 light years away from the Earth in the constellation Libra.
It is a metal-poor star, which means it has a low abundance of elements heavier than helium.
At the time of its discovery, HIP 13044 b orbited what was noted as the oldest and most metal-poor star yet discovered.
Any planets that did form around a metal-poor star would probably be low in mass, and thus unfavorable for life.
Caffau had been searching for extremely metal-poor stars for the past ten years.
