Cayrel's Star
 | This article includes a list of general references, but it lacks sufficient corresponding inline citations. (June 2013) |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cetus[1] |
| Right ascension | 01h 29m 31.1311s[2] |
| Declination | −16° 00′ 45.496″[2] |
| Apparent magnitude (V) | 11.642[3] |
| Astrometry | |
| Proper motion (μ) | RA: 11.745[2] mas/yr Dec.: −42.709[2] mas/yr |
| Parallax (π) | 0.4806±0.0462 mas[2] |
| Distance | 6,800 ± 700 ly (2,100 ± 200 pc) |
| Other designations | |
| BD−16°251, CS31082-001, Cayrel's Star | |
| Database references | |
| SIMBAD | data |
BPS CS31082-0001, named Cayrel's Star /keɪˈrɛlz/,[4] is an old Population II star located in a distance of 2.1 kpc[2] in the galactic halo. It belongs to the class of ultra-metal-poor stars (metallicity [Fe/H] = -2.9), specifically the very rare subclass of neutron-capture enhanced stars. It was discovered by Tim C. Beers and collaborators with the Curtis Schmidt telescope at the Cerro Tololo Inter-American Observatory in Chile and analyzed by Roger Cayrel and collaborators. They used the Very Large Telescope at the European Southern Observatory in Paranal, Chile for high-resolution optical spectroscopy to determine elemental abundances. The thorium-232 to uranium-238 ratio was used to determine the age. It is estimated to be about 12.5 billion years old, making it one of the oldest known.
Compared to other ultra-metal-poor, r-process enriched stars (eg. CS22892-052, BD+17°3248, HE 1523-0901) CS31082-001 has higher abundances of the actinides (Th, U), but a surprisingly low Pb abundance.
See also
[edit]References
[edit]- ^ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
- ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ Munari, U.; Henden, A.; Frigo, A.; Zwitter, T.; Bienaymé, O.; Bland-Hawthorn, J.; Boeche, C.; Freeman, K. C.; Gibson, B. K.; Gilmore, G.; Grebel, E. K.; Helmi, A.; Kordopatis, G.; Levine, S. E.; Navarro, J. F.; Parker, Q. A.; Reid, W.; Seabroke, G. M.; Siebert, A.; Siviero, A.; Smith, T. C.; Steinmetz, M.; Templeton, M.; Terrell, D.; Welch, D. L.; Williams, M.; Wyse, R. F. G. (2014). "APASS Landolt-Sloan BVgri Photometry of RAVE Stars. I. Data, Effective Temperatures, and Reddenings". The Astronomical Journal. 148 (5): 81. arXiv:1408.5476. Bibcode:2014AJ....148...81M. doi:10.1088/0004-6256/148/5/81. hdl:1885/19979. S2CID 56127278.
- ^ Space Math @ NASA
Sources
[edit]- Beers, T. C.; Preston, G. W.; Shectman, S. A. (October 1985). "A search for stars of very low metal abundance. I". The Astronomical Journal. 90: 2089–2102. Bibcode:1985AJ.....90.2089B. doi:10.1086/113917. ISSN 1538-3881.
- Beers, Timothy C.; Preston, George W.; Shectman, Stephen A. (June 1992). "A search for stars of very low metal abundance. II". The Astronomical Journal. 103: 1987–2034. Bibcode:1992AJ....103.1987B. doi:10.1086/116207. ISSN 1538-3881.
- Cayrel, R.; Hill, V.; et al. (February 2001). "Measurement of stellar age from uranium decay". Nature. 409 (6821): 691–692. arXiv:astro-ph/0104357. Bibcode:2001Natur.409..691C. doi:10.1038/35055507. ISSN 1476-4687. PMID 11217852.
- Schatz, Hendrik; Toenjes, Ralf; et al. (November 2002). "Thorium and Uranium Chronometers Applied to CS 31082-001". The Astrophysical Journal. 579 (2): 626–638. arXiv:astro-ph/0104335. Bibcode:2002ApJ...579..626S. doi:10.1086/342939. ISSN 0004-637X.
External links
[edit]- "BPS CS 31082-0001". SIMBAD. Centre de données astronomiques de Strasbourg.
- arXiv: Measurement of stellar age from uranium decay, R. §Cayrel et al.
- R-Process Cosmo-Chronometers
