2024A&A...688A.123X

Query : 2024A&A...688A.123X

2024A&A...688A.123X - Astronomy and Astrophysics, volume 688A123 (2024/8-1)

The R-Process Alliance: Analysis of limited-r stars.

XYLAKIS-DORNBUSCH T., HANSEN T.T., BEERS T.C., CHRISTLIEB N., EZZEDDINE R., FREBEL A., HOLMBECK E., PLACCO V.M., ROEDERER I.U., SAKARI C.M. and SNEDEN C.

Abstract (from CDS):

Context. In recent years, the R-Process Alliance (RPA) has conducted a successful search for stars that are enhanced in elements produced by the rapid neutron-capture (r-)process. In particular, the RPA has uncovered a number of stars that are strongly enriched in light r-process elements, such as Sr, Y, and Zr. These so-called limited-r stars were investigated to explore the astrophysical production site(s) of these elements.
Aims. We investigate the possible formation sites for light neutron-capture elements by deriving detailed abundances for neutron-capture elements from high-resolution spectra with a high signal-to-noise ratio of three limited-r stars.
Methods. We conducted a kinematic analysis and a 1D local thermodynamic equilibrium spectroscopic abundance analysis of three stars. Furthermore, we calculated the lanthanide mass fraction (XLa) of our stars and of limited-r stars from the literature.
Results. We found that the abundance pattern of neutron-capture elements of limited-r stars behaves differently depending on their [Ba/Eu] ratios, and we suggest that this should be taken into account in future investigations of their abundances. Furthermore, we found that the XLa of limited-r stars is lower than that of the kilonova AT2017gfo. The latter seems to be in the transition zone between limited-rXLa and that of r-I and r-II stars. Finally, we found that unlike r-I and r-II stars, the current sample of limited-r stars is largely born in the Galaxy and is not accreted.

Abstract Copyright: © The Authors 2024

Journal keyword(s): stars: abundances - stars: chemically peculiar - stars: kinematics and dynamics - stars: Population II

VizieR on-line data: <Available at CDS (J/A+A/688/A123): table3.dat table4.dat refs.dat tablea1.dat>

Simbad objects: 52

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Number of rows : 52
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 UCAC2 28125887 Pe* 00 30 52.6719174432 -10 07 04.183493916   13.602 12.772 12.64 11.80 ~ 10 0
2 TYC 1741-618-1 Pe* 00 38 59.6788012512 +27 25 51.676325904   12.86 11.73     ~ 3 0
3 UCAC2 5736457 Pe* 01 09 43.2950528256 -59 07 23.017414224   13.039 12.165 12.17 11.21 ~ 9 0
4 HD 13979 Pe* 02 15 20.8534060680 -25 54 54.872825148   9.81 9.18     F/Gw 97 0
5 HD 19445 Pe* 03 08 25.5883873084 +26 19 51.400965175 8.29 8.52 8.06 7.60 7.27 G2VFe-3 801 0
6 CD-24 1782 Pe* 03 38 41.4850201416 -24 02 50.292102948   10.54 9.97 9.246 8.811 ~ 91 0
7 TYC 4724-557-1 Pe* 03 55 09.2800607400 -06 37 10.979094828   12.766 12.44     ~ 15 0
8 TYC 8507-1765-1 Pe* 03 56 37.0353995424 -58 38 28.070925396   12.761 11.450 10.694 10.043 CEMP 20 0
9 BPS CS 30494-0003 Pe* 03 59 10.0225290432 -21 06 47.970391212     12.33   11.474 ~ 13 0
10 HD 26169 Pe* 04 00 52.4379302184 -75 36 11.436994836 9.58 9.53 8.80 8.51 8.73 G3wpec 88 0
11 BPS CS 22186-0023 RG* 04 19 45.5332495464 -36 51 35.980987284   13.57 12.84   11.925 ~ 23 0
12 2MASS J05384334-5147228 Pe* 05 38 43.3370560781 -51 47 22.778633031           CEMP 6 0
13 DENIS J080254.5-522430 LP? 08 02 54.4966674816 -52 24 30.414470760   14.145 12.375 11.80 10.29 ~ 8 0
14 HD 237846 Pe* 09 52 38.6827483320 +57 54 58.614479532   10.60 9.95     CEMP-no 105 0
15 HD 88609 Pe* 10 14 28.9853799600 +53 33 39.342740796 9.930 9.540 8.620 7.78 7.15 G5IIIw 217 0
16 UCAC2 11063799 Pe* 10 34 47.8560681072 -48 23 54.517560792   12.477 11.641 11.46 10.63 ~ 8 0
17 UCAC4 314-070049 Pe* 13 08 58.4999810784 -27 12 18.883508616   14.19 12.99 12.70   CEMP 7 0
18 GrW 170817 GWE 13 09 48.0850 -23 22 53.343           ~ 2683 0
19 BD-13 3695 RG* 13 22 44.1122246232 -13 55 31.431021528   11.428 10.686 9.794 9.434 ~ 35 0
20 UCAC4 373-066758 Pe* 13 26 04.5123285192 -15 25 01.987925376   12.459 11.461 11.339   ~ 13 0
21 TYC 6722-1134-1 Pe* 13 33 52.8238634928 -26 23 54.012114204   11.853 11.072 10.63 10.047 CEMP 12 0
22 HD 122563 Pe* 14 02 31.8455084952 +09 41 09.944391876 7.47 7.10 6.19 5.37 4.79 G8:III:Fe-5 920 0
23 TYC 6731-975-1 Pe* 14 16 40.8391305936 -24 22 00.049664064   11.911 10.873 10.38 9.684 ~ 19 0
24 BD-20 4079 Pe* 14 43 51.9530498088 -21 06 28.317722904   12.269 10.923     CEMP 9 0
25 CD-43 9427 Pe* 14 53 33.0787450584 -44 28 30.138302568   11.900 10.929     Gwl 18 0
26 TYC 5597-880-1 Pe* 15 47 55.1709122328 -08 37 10.300346616   12.718 11.20     CEMP 9 0
27 HD 144495 Pe* 16 06 42.3196480560 -16 32 45.899884752   11.213 9.82 8.97 9.092 F8/G3 19 0
28 TYC 5057-428-1 Pe* 16 39 31.0656040320 -05 22 51.783176820   12.692 11.298     ~ 9 0
29 UCAC2 30389153 * 16 45 51.1619782272 -04 29 47.310046404   13.666 12.203 11.86 10.43 ~ 9 0
30 UCAC4 078-043871 Pe* 17 28 59.2935880224 -74 27 53.324312940   13.94 13.07 12.97   ~ 6 0
31 UCAC4 203-173073 Pe* 18 12 10.4591393784 -49 34 49.390479732   13.76 12.63 12.34   CEMP 6 0
32 HD 175606 Pe* 18 58 51.3362885520 -51 27 56.498489424   10.15 9.80     F/Gw 51 0
33 UCAC4 118-148541 Pe* 19 20 20.6995328280 -66 27 20.306780892   13.75 12.76 12.49   CEMP 7 0
34 HD 184266 HB* 19 34 15.3865887336 -16 19 00.228534420 8.27 8.12 7.57     F2V 133 0
35 UCAC2 6703127 Pe* 19 34 54.9730514808 -57 51 39.965760144   14.554 13.131 12.69 11.57 ~ 9 0
36 BPS CS 22891-0209 Pe* 19 42 02.1802427088 -61 03 44.534898612   13.03 12.18     KIIvw 64 0
37 UCAC2 8419818 Pe* 19 49 40.2618024072 -54 24 11.350436184   13.705 12.75 12.42 11.45 ~ 10 0
38 UCAC2 5726991 Pe* 19 53 49.7804195664 -59 40 00.163242192   13.592 12.620   11.48 KIIvw 54 0
39 UCAC2 21432948 Pe* 19 59 45.5784925848 -25 49 07.593512016   13.346 12.212 12.01 10.92 ~ 8 0
40 BPS CS 30336-0121 Pe* 20 31 35.3103516648 -31 27 31.959798552   14.364 13.571 13.49   ~ 15 0
41 BPS CS 22940-0070 RR* 20 42 39.2494423512 -61 40 39.106422552   15.35 14.87     ~ 22 0
42 BPS CS 22879-0103 HB* 20 47 10.1397614064 -37 26 52.506501396   14.79 14.30     ~ 15 0
43 HD 358059 Pe* 20 56 09.1348060632 -13 31 17.690158776   11.016 10.192     G0 74 0
44 BPS CS 22897-0008 Pe* 21 03 11.8565397504 -65 05 08.852220600   14.02 13.33     CEMP-no 80 0
45 BPS CS 29501-0051 HB* 21 14 40.6179247608 -37 24 51.771638016   14.55 14.02     ~ 17 0
46 BD-09 5746 SB* 21 26 47.8232412744 -08 23 56.098568220   11.68 11.2     ~ 37 0
47 UCAC4 403-135428 Pe* 21 37 08.0861703360 -09 27 34.614506592   14.505 13.264 12.943   CEMP 16 0
48 TYC 5795-255-1 Pe* 21 40 23.0491446264 -12 27 03.558208068   11.88 11.14     ~ 5 0
49 HE 2141-3741 RG* 21 44 51.1647807408 -37 27 55.017356112   14.10 13.47     CEMP-no 60 0
50 BPS CS 29502-0092 Pe* 22 22 35.9982138384 -01 38 27.620508552   12.64 11.87 11.365 10.862 CEMP-no 67 0
51 BPS CS 22956-0114 Pe* 22 26 08.1902714328 -65 33 06.631324776   14.68 14.04 13.96   ~ 12 0
52 NAME Gaia Enceladus-Sausage St* ~ ~           ~ 860 0

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