HE0107-5240 is the second most metal-poor star
known. It has a metallicity of less
than -5.0 and a corresponding iron content that is some 200,000 times less
than that of the Sun. On this basis, it is the second oldest known star
in the Milky Way Galaxy with an estimated
age of about 12 billion years. HE1327-2326 lies in the constellation Phoenix (RA 01h 09m 29.1s, Dec. -52° 24' 20") at a distance of 36,000 light-years.
It has about four-fifths the mass of the Sun and a visual magnitude of 15.9.
|HE0107-5240. Credit: NASA
- Christlieb, N., Bessell, M. S., Gustafsson, B., Korn, A., Barklem,
P. S., Karisson T., Mizuno-Wiedner M., and Rossi, S. "A stellar relic
from the early Milky Way," Nature, 419, 904-906 (2002).