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HD 140283 (also known as the Methuselah star) is a metal-poor subgiant star about 200 light years away from the Earth in the constellation Libra, near the boundary with Ophiuchus in the Milky Way Galaxy. Its apparent magnitude is 7.205, so it can be seen with binoculars. It is one of the oldest stars known.
The globular cluster M80.Stars in globular clusters are mainly older metal-poor members of population II.. In astronomy, metallicity is the abundance of elements present in an object that are heavier than hydrogen and helium.
HE0107-5240 is an extremely metal-poor Population II star, located roughly 36 000 light-years away from Earth. It is one of the most metal-poor stars known in our Galaxy, with a metallicity [Fe/H] = −5.2 ± 0.2; [3] i.e. it has just 1 / 160 000 of the metal that the Sun has. Because of its very low metallicity, it is believed to be ...
The heavy metal subdwarfs are a type of hot subdwarf star with high concentrations of heavy metals. The metals detected include germanium , strontium , yttrium , zirconium and lead . Known heavy metal subdwarfs include HE 2359-2844 , LS IV-14 116 , and HE 1256-2738 .
The spectrum of a class M star contains lines from oxide molecules (in the visible spectrum, especially TiO) and all neutral metals, but absorption lines of hydrogen are usually absent. TiO bands can be strong in class M stars, usually dominating their visible spectrum by about M5.
HE 2359-2844 is a subdwarf located approximately 800 light years away in the constellation Sculptor, with a surface temperature of approximately 38,000 °C (68,400 °F).). Along with stars HE 1256-2738 and LS IV-14 116, HE 2359-2844 forms a new group of star called heavy metal subdw