Cayrel's Star

BPS CS31082-0001
Observation data Epoch J2000 Equinox J2000
Constellation	Cetus
Right ascension	01h 29m 30.31s
Declination	-16° 08' 5.51"
Apparent magnitude (V)	11.7
Other designations
BD -16°251, CS31082-001

BPS CS31082-0001, named Cayrel's Star,^[1] is an old Population II star located in a distance of 4 kpc 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 (VLT) 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 (as CS22892-052, BD +17° 3248, HE 1523-0901) CS31082-001 has higher abundances of the actinides (Th, U), but a surprisingly low Pb abundance.

References

↑ Space Math @ NASA

Beers, T. C., G. W. Preston and S. A. Shectman, A search for stars of very low metal abundance. I., Astron. J., 90, 2089-2102 (1985)
Beers, T. C., G. W. Preston and S. A. Shectman, A search for stars of very low metal abundance. II., Astron. J., 103, 1987-2034 (1992)
Cayrel, R., et al. Measurement of stellar age from uranium decay, Nature, Volume 409, Issue 6821, pp. 691–692 (2001)
Schatz, H., al. Thorium and Uranium Chronometres applied to CS 31082-001, Astrophysical Journal, 579 (2002) 628 - 638

External links

SIMBAD-Entry (SIMBAD)
arXiv: Measurement of stellar age from uranium decay, R. §Cayrel et al.
R-Process Cosmo-Chronometers

Cetus constellation

Stars (list)

Bayer	α (Menkar) β (Deneb Kaitos, Diphda) γ (Kaffaljidhma) δ ε ζ (Baten Kaitos) η θ ι κ¹ κ² λ μ ν ξ¹ ξ² ο A (Mira) ο B (VZ Ceti) π ρ σ τ (Durre Menthor) υ¹ υ² φ¹ φ² φ³ φ⁴ χ

Flamsteed	1 2 3 6 7 9 10 11 12 13 14 15 18 20 21 25 26 27 28 29 30 32 33 34 35 36 37 38 39 40 41 42 43 44 46 47 48 49 50 57 58 60 61 62 63 64 66 67 69 70 71 75 77 79 80 81 84 93 94 95 25 Ari

Variable	T RR TV TW UU VZ WW WX XY XZ YZ ZZ AA AB AD AR BG BK CF DK EH EL EO ES

HR	9 10 12 16 31 37 51 61 66 72 108 115 118 150 159 172 173 174 190 197 201 206 210 218 220 227 228 232 247 251 263 320 325 387 388 392 394 404 405 406 416 425 448 466 473 492 500 507 513 560 608 611 616 625 638 651 672 684 692 693 697 713 719 725 732 735 737 745 751 766 770 775 783 784 795 796 816 870 908 926 942 9054 9095 9096 9101

HD	1690 1879 2268 2638 4747 5319 6037 6718 7449 8713 8896 9690 9731 10024 10725 11365 11396 11506 11964 12116 12702 13004 13546 13763 15115 16008 16031 16152 17001 224349 224693

Gliese	Gliese 40 Gliese 105 GJ 1002 GJ 1005 GJ 1057 GJ 2012

Other	BD-17°63 Cayrel's Star CFBDS J005910.90-011401.3 CS 31082-001 DENIS-P J020529.0-115925 GD 40 HIP 5158 HIP 11952 L 870-2 Luyten 726-8 (UV/BL) PSR B0031-07 PSR J0034-0534 PSR J0108-1431 SDSS J001820.5-093939.2 SDSS J0106-1000 ULAS J003402.77−005206.7 WASP-26 WASP-44 WASP-71 WISE J0254+0223

Nebulae

Planetary	BoBn 1 NGC 246

Galaxies

Messier	77

NGC	17 35 45 47 50 54 59 61 62 64 65 66 73 77 102 107 113 114 117 118 120 124 132 135 142 143 144 145 151 154 155 157 161 163 165 166 167 168 170 171 172 173 177 178 179 187 191 192 195 196 197 201 207 209 210 216 217 219 223 227 230 232 235A 235B 237 239 244 245 247 255 259 263 268 270 271 273 274 275 276 277 279 283 284 285 286 291 293 297 298 301 303 307 309 320 321 325 327 329 331 333 333B 335 336 337 337A 340 341 341B 342 343 344 345 347 349 350 351 352 353 355 356 357 359 363 364 367 369 377 391 413 417 426 428 429 430 435 442 445 448 450 478 480 481 487 493 497 519 521 530 533 535 538 539 540 541 543 545 547 548 550 554A 554B 555 556 557 558 560 564 565 567 570 577 578 583 584 585 586 589 593 594 596 599 600 601 615 617 622 624 635 636 640 647 648 649 655 667 681 682 690 699 701 702 707 713 715 720 725 726 731 734 747 748 755 756 758 762 767 768 773 779 787 788 790 799 800 806 808 809 811 814 815 825 827 829 830 831 833 835 836 837 838 839 840 842 844 848 849 850 851 853 858 859 863 864 867 868 872 873 874 878 879 880 881 883 887 892 894 895 899 902 905 907 908 921 926 929 934 936 941 942 943 944 945 947 948 950 951 955 958 960 963 965 966 967 975 977 981 985 988 989 991 993 997 998 1004 1007 1008 1009 1010 1011 1013 1015 1016 1017 1018 1019 1020 1021 1022 1026 1032 1033 1034 1035 1038 1041 1042 1043 1044 1045 1046 1047 1048 1048A 1051 1052 1055 1063 1064 1065 1069 1070 1071 1072 1073 1074 1075 1076 1078 1080 1085 1087 1090 1094 1095 1101 1104 1105 1107 1128 1137 1141 1142 1149 1153 1194 1211 1218 1219 1254 1280 7807 7808 7813 7821 7828 7829

Other	Arp 147 3C 15 3C 17 3C 75 Cetus Dwarf Spheroidal galaxy HCM-6A IC 1613 IRAS F01475-0740 Markarian 573 Markarian 1014 Markarian 1018 Markarian 1044 NAB 0205+024 PHL 938 PKS 0048-097 PKS 0106+013 PKS 0119-046 PKS 0139-097 PKS 0215+015 PKS 0237-233 PKS 0306+102 QSO B0137+012 QSO B0302-003 SDSS J0303-0019 SMM J02399-0136 9Spitch Ton S180 UM 673 VV 114 Wolf–Lundmark–Melotte

Galaxy
clusters

Abell 85
Abell 119
Abell 133
Abell 151
Abell 168
Abell 194
Abell 209
Abell 267
Abell 370
Abell 400
HCG 16
IRC 0218
JKCS 041
RX J0152.7-1357

Other

GRB 000911
GRB 041006
GRB 050908
GRB 060908
GRB 091127
SN 1984L
SN 2005gj
SN 2005hk

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Cayrel's Star

See also

References

External links