HE 1327-2326

HE1327-2326, discovered in 2005 by Anna Frebel and collaborators,[2] was the star with the lowest known iron abundance until SMSS J031300.36−670839.3 was discovered.[3] The star is a member of Population II stars, with a solar-standardised iron to hydrogen index (Fe:H), or metallicity, of −5.6. The scale being logarithmic, this number indicates that its iron content is 1/400,000 that of the Earth's sun. However, it has a carbon abundance of roughly one-tenth solar ([C/H] = −1.0), and it is not known how these two abundances can have been produced/exist simultaneously. Discovered by the Hamburg/ESO survey for metal-poor stars, it was probably formed during an age of the universe when the metal content was much lower. It has been speculated that this star is part of the second generation, born out of the gas clouds which were imbued with elements such as carbon by the primordial Population III stars.

HE1327-2326
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Hydra
Right ascension  13h 30m 06s[1]
Declination −23° 41′ 54″[1]
Apparent magnitude (V) 13.5
Astrometry
Distance4000 ly
Details
Mass0.8 M☉
Metallicity = −5.6
Other designations
HE 1327-2326, SPM3.2 4266486.
Database references
SIMBADdata

See also
Ultra low metallicity / ultra metal poor stars

References
  1. The Optical Gravitational Lensing Experiment. Additional Planetary and Low-Luminosity Object Transits from the OGLE 2001 and 2002 Observational Campaigns, A. Udalski, G. Pietrzynski, M. Szymanski, M. Kubiak, K. Zebrun, I. Soszynski, O. Szewczyk, and L. Wyrzykowski, Acta Astronomica 53 (June 2003), pp. 133–149.
  2. Frebel A., Aoki W., Christlieb N., Ando H., Asplund M., Barklem P.S., Beers T.C., Eriksson K., Fechner C., Fujimoto M.Y., Honda S., Kajino T., Minezaki T., Nomoto K., Norris J.E., Ryan S.G., Takada-Hidai M., Tsangarides S., Yoshii Y. (14 April 2005). "Nucleosynthetic signatures of the first stars". Nature. 434 (7035): 871–873. arXiv:astro-ph/0503021. Bibcode:2005Natur.434..871F. doi:10.1038/nature03455. PMID 15829957.CS1 maint: uses authors parameter (link)
  3. Brainard, Curtis (10 February 2014). "The Archaeology of the Stars". New York Times. Retrieved 10 February 2014.


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