2003NewA....8..767O


C.D.S. - SIMBAD4 rel 1.7 - 2020.03.28CET23:11:05

2003NewA....8..767O - New Astronomy, 8, 767-776 (2003/November-0)

r-process abundance universality and actinide cosmochronology.

OTSUKI K., MATHEWS G.J. and KAJINO T.

Abstract (from CDS):

We review recent observational and theoretical results concerning the presence of actinide nuclei on the surfaces of old halo stars and their use as an age determinant. We present model calculations which show that the observed universality of abundances for 56<Z<75 elements in these stars does not necessarily imply a unique astrophysical site for the r-process. Neither does it imply a universality of abundances of nuclei outside of this range. In particular, we show that a variety of astrophysical r-process models can be constructed which reproduce the same observed universal r-process curve for 56<Z<75 nuclei, yet have vastly different abundances for Z≥75 and possibly Z<56 as well. This introduces an uncertainty into the use of the Th/Eu chronometer as a means to estimate the ages of the metal deficient stars. We do find, however, that the U/Th ratio is a robust chronometer. This is because the initial production ratio of U to Th is almost independent of theastrophysical! nucleosynthesis environment. The largest remaining uncertainties in the U/Th initial production ratio are due to the input nuclear physics models.

Abstract Copyright:

Journal keyword(s): Stars: abundances - Supernovae: general

Status at CDS:  

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 6268 Pe* 01 03 18.1719480473 -27 52 49.953588224   9.725 9.046 8.601   F/Gw 134 0
2 BPS CS 31082-0001 Pe* 01 29 31.1311330115 -16 00 45.496485322 12.527 12.427 11.642 11.189 10.713 CEMP 239 0
3 HD 108577 PM* 12 28 16.8615508146 +12 20 41.090259163   10.18 9.55 9.8   KIIvw 66 0
4 HD 115444 Pe* 13 16 42.4591800169 +36 22 52.695481224   9.77 8.97 8.3 7.88 G9V 222 0
5 HD 126238 Pe* 14 25 29.9570911985 -43 38 36.947126248   8.44 7.68 7.44   G3/8wF0/2 101 1
6 BPS CS 30306-0132 Pe* 15 14 18.9190922462 +07 27 02.682876503   13.62 12.73 12.421 11.948 ~ 30 0
7 BD+17 3248 HB* 17 28 14.4691668039 +17 30 35.848406966   10.02 9.34     KIIvw 196 0
8 HD 186478 Pe* 19 45 14.1410795461 -17 29 27.071420634   10.116 9.302 8.527 7.961 K2III 128 0
9 BPS CS 22892-0052 Pe* 22 17 01.6558480594 -16 39 27.051900047   14.03 13.20 13.06 12.19 KIIvw 405 0

    Equat.    Gal    SGal    Ecl

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2020.03.28-23:11:05

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