HE 1327-2326

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Star
HE 1327-2326
HE 1327-2326 is in this area.
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Water snake
Right ascension 13 h 30 m 5.95 s
declination -23 ° 41 ′ 49.7 ″
Apparent brightness 13.5 likes
Typing
Astrometry
Radial velocity +112 km / s
Physical Properties
Metallicity [Fe / H] −5.6
Other names
and catalog entries
2MASS catalog 2MASS J13300595-2341497 [1]
Other names HE 1327-2326 • SPM3.2 4266486

HE1327-2326 is a carbon star in the constellation Hydra . Until the discovery of SMSS J031300.36-670839.3 in 2014, it was the star with the lowest known iron content. HE1327-2326 was in 2005 by the astronomer Anna Frebel and her team as part of the Hamburg / ESO survey for metal-poor stars in the Siding Spring Observatory discovered.

HE1327-2326 belongs to the 2nd population and was created at a time when the universe contained far fewer metals (here: elements except hydrogen and helium) than it does today.

Its metallicity is −5.6. This means that its iron content is only 1 / 400,000 that of the sun. Its carbon content is about 10% of that of the sun.

In 2019, Frebel and colleagues were also able to demonstrate a relatively high zinc content of around 80 percent of the iron content. This provided evidence of the first generation of stars (population III), which, according to supernova model calculations, could only have such a high zinc content if the supernova was very asymmetrical with jets that distributed heavy elements into the surrounding galaxies.

Web links

Individual evidence

  1. ↑ http://newsoffice.mit.edu/2014/researchers-identify-one-of-the-earliest-stars-in-the-universe-0209
  2. ↑ A. Frebel, W. Aoki, N. Christlieb, H. Ando, ​​M. Asplund, PS Barklem, TC Beers, K. Eriksson, C. Fechner, MY Fujimoto, S. Honda, T. Kajino, T. Minezaki, K. Nomoto, JE Norris, SG Ryan, M. Takada-Hidai, S. Tsangarides, Y. Yoshii: Nucleosynthetic signatures of the first stars, Nature, Volume 434, 2005, pp. 871-873. Arxiv
  3. ↑ Rana Ezzeddine, Anna Frebel, I. Roederer, N. Tominaga, M. Ishigaki, K. Nomoto, J. Tumlinson, V. Placco, W. Aoki, Evidence for an Aspherical Population III Supernova Explosion Inferred from the Hyper-metal- poor Star HE 1327-2326, Astroph. J., Volume 876, No. 2, 2019, Arxiv
  4. ↑ Jennifer Chu: Explosions of universe's first stars spewed powerful jets , MIT Technology News, May 8, 2019