41. 11 Com is a low metallicity star with an iron abundance about half that of the Sun. 42. Their low metallicity seems to serve as proof that HVCs do indeed bring in fresh gas. 43. The metallicity is the proportion of elements other than hydrogen or helium, as compared to the Sun. 44. Its extremely low metallicity indicates it is very old one of the oldest clusters in the Milky Way. 45. This immediately suggests that metallicity has evolved through the generations of stars by the process of stellar evolution. 46. The two most important stellar properties are mass and metallicity because it determines how these planetary systems form. 47. This strongly indicates that the low metallicity of the environment, rather than the crowding, is responsible. 48. NGC 2516 and the recently discovered nearby star cluster Mamajek 2 in Ophiuchus have similar age and metallicity . 49. "' HD 155358 "'is a low metallicity yellow dwarf star approximately 43 Hercules. 50. It has higher metallicity by 25 % and very similar stellar age of 4.6 billion years.
