2010A&A...509A..84L


Query : 2010A&A...509A..84L

2010A&A...509A..84L - Astronomy and Astrophysics, volume 509, A84-84 (2010/1-1)

Accuracy of spectroscopy-based radioactive dating of stars.

LUDWIG H.-G., CAFFAU E., STEFFEN M., BONIFACIO P. and SBORDONE L.

Abstract (from CDS):

Combined spectroscopic abundance analyses of stable and radioactive elements can be applied for deriving stellar ages. The achievable precision depends on factors related to spectroscopy, nucleosynthesis, and chemical evolution. We quantify the uncertainties arising from the spectroscopic analysis, and compare these to the other error sources. We derive formulae for the age uncertainties arising from the spectroscopic abundance analysis, and apply them to spectroscopic and nucleosynthetic data compiled from the literature for the Sun and metal-poor stars. We obtained ready-to-use analytic formulae of the age uncertainty for the cases of stable+unstable and unstable+unstable chronometer pairs, and discuss the optimal relation between to-be-measured age and mean lifetime of a radioactive species. Application to the literature data indicates that, for a single star, the achievable spectroscopic accuracy is limited to about ±20% for the foreseeable future. At present, theoretical uncertainties in nucleosynthesis and chemical evolution models form the precision bottleneck. For stellar clusters, isochrone fitting provides a higher accuracy than radioactive dating, but radioactive dating becomes competitive when applied to many cluster members simultaneously, reducing the statistical errors by a factor sqrt(N). Spectroscopy-based radioactive stellar dating would benefit from improvements in the theoretical understanding of nucleosynthesis and chemical evolution. Its application to clusters can provide strong constraints for nucleosynthetic models.

Abstract Copyright:

Journal keyword(s): Sun: abundances - stars: abundances - stars: fundamental parameters - line: formation

CDS comments: In tables BD +82 856 is a misprint for BD +08 2856.

Simbad objects: 24

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Number of rows : 24
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 BPS CS 31082-0001 Pe* 01 29 31.1311443552 -16 00 45.495314460 12.527 12.427 11.642 11.189 10.713 CEMP 276 0
2 HD 108577 PM* 12 28 16.8614710944 +12 20 41.089853184   10.18 9.55 9.8   KIIvw 71 0
3 HD 115444 Pe* 13 16 42.4590842616 +36 22 52.692135420   9.77 8.97 8.3 7.88 G9V 235 0
4 BD+08 2856 * 14 23 58.1664038424 +08 01 33.333124908   10.90 10.08     KIIvw 61 0
5 2MASS J15184449+0202053 RG* 15 18 44.4962016312 +02 02 05.423756928   14.4600 13.2300   12.0046 ~ 28 0
6 2MASS J15184495+0202034 RG* 15 18 44.9526006144 +02 02 03.568247448   13.8900 12.2000   10.6289 ~ 35 0
7 HE 1523-0901 Pe* 15 26 01.0697532504 -09 11 38.885639784   12.37 11.50 10.476 9.863 CEMP 71 0
8 2MASS J16231442-2636055 RG* 16 23 14.4181955592 -26 36 05.547999564 14.64 12.73 10.88 9.80 9.04 ~ 43 0
9 NGC 6121 471 RG* 16 23 16.5623721744 -26 32 09.733929072 14.79 13.236 11.661   9.896 ~ 33 0
10 CD-26 11312 RG* 16 23 23.8093956576 -26 34 29.821786140 14.75 12.63 10.76   8.51 ~ 36 0
11 NGC 6121 45 RG* 16 23 29.1248946984 -26 30 29.805818400 14.92 13.354 11.781   9.988 ~ 43 0
12 CD-26 11313 AB* 16 23 30.8920148160 -26 27 04.098919788   12.598 10.808   8.880 K2 38 0
13 NGC 6121 259 RG* 16 23 38.4683784336 -26 33 19.295581140 15.13 12.818 10.833   8.608 ~ 37 0
14 Cl* NGC 6121 LEE 4511 RG* 16 23 49.8048740256 -26 33 58.872520404 14.83 13.177 11.568   9.748 ~ 26 0
15 2MASS J16235946-2627572 AB* 16 23 59.4618765552 -26 27 57.227309676   12.851 11.284   9.512 ~ 31 0
16 2MASS J16240301-2624034 AB* 16 24 03.0209319576 -26 24 03.464563248   12.571 10.859   8.967 ~ 42 0
17 2MASS J17163748+4306155 RG* 17 16 37.4894075472 +43 06 15.600437640   13.47 12.18     ~ 70 0
18 BD+17 3248 HB* 17 28 14.4690179544 +17 30 35.847574776   10.02 9.34     KIIvw 212 0
19 HD 186478 Pe* 19 45 14.1409752672 -17 29 27.071239056   10.116 9.302 8.527 7.961 K2III 145 0
20 NGC 7078 341 RG* 21 29 54.9258244080 +12 13 22.484816292   13.72 12.54   11.22 ~ 51 0
21 2MASS J21295666+1209463 RG* 21 29 56.6627934840 +12 09 46.341312228   14.45 12.90     ~ 35 0
22 2MASS J21295856+1209214 RG* 21 29 58.5643129152 +12 09 21.382732260   14.26 12.83     ~ 28 0
23 BPS CS 22892-0052 Pe* 22 17 01.6558764360 -16 39 27.051026544   14.03 13.20 13.06 12.19 KIIvw 433 0
24 HD 221170 Pe* 23 29 28.8087143040 +30 25 57.849303180 9.43 8.74 7.66     CEMP-r 277 0

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2023.01.27-11:47:24

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