2025RAA....25h5015A

Query : 2025RAA....25h5015A

2025RAA....25h5015A - Research in Astron. and astroph., 25, part no 8, 5015 (2025/August-0)

The Abundance Origin of a Highly r-process Enhanced r-II Star: LAMOST J020623.21+494127.9.

ASHRAF M.Z., CUI W. and LI H.

Abstract (from CDS):

Object LAMOST J020623.21+494127.9 (program star) in the thin disk of the Milky Way is reported as a highly r-process-enhanced r-II star with [Eu/Fe] = +1.32 and [Fe/H] = -0.54. The chemical profile of the star reflects the intrinsic composition of the gas cloud present at its birth. Using an abundance decomposition method, we fit 25 elements from the abundance data set, including 10 heavy neutron-capture elements. We explore the astrophysical origin of the elements in this star through its abundance ratios and component ratios. We find that the contributions from the massive stars played a significant role in the production of light elements in the program star. Our analysis reveals that the heavy neutron-capture elements are produced purely by the main r-process. However, the adopted main r-process model does not adequately fit the observed data, suggesting another main r-process pattern may exist.

Abstract Copyright: © 2025. National Astronomical Observatories, CAS and IOP Publishing Ltd. All rights, including for text and data mining, AI training, and similar technologies, are reserved.

Journal keyword(s): nuclear reactions, nucleosynthesis, abundances - stars: abundances - stars: chemically peculiar

Simbad objects: 14

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Number of rows : 14
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 BD-16 251 RG* 01 29 31.1311443552 -16 00 45.495314460 12.527 12.427 11.642 11.189 10.713 CEMP 318 0
2 LAMOST J020632.21+494127.9 * 02 06 32.1877413151 +49 41 27.978053694           ~ 5 0
3 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
4 [WMO2015] 129 RG* 03 34 57.5852522640 -54 05 31.339557060           ~ 17 0
5 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 375 0
6 [KCB2015] Reti 18 RG* 03 36 07.7638135488 -54 02 35.507879592           ~ 21 0
7 HD 88609 Pe* 10 14 28.9853799600 +53 33 39.342740796 9.930 9.540 8.620 7.78 7.15 G5IIIw 217 0
8 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
9 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
10 2MASS J15095862+6716200 RB? 15 09 58.6103318448 +67 16 20.032584024   18.53 17.006   15.614 ~ 41 0
11 UCAC2 13007354 Pe* 18 02 42.2736456576 -44 04 42.648519648   13.851 12.621 12.30 11.26 CEMP 19 0
12 2MASS J18174532-3353235 RG* 18 17 45.3298477536 -33 53 23.569406016     13.957 13.63   ~ 12 0
13 BPS CS 22892-0052 Pe* 22 17 01.6558764360 -16 39 27.051026544   14.03 13.20 13.06 12.19 KIIvw 472 0
14 HD 222925 Pe* 23 45 17.6074777008 -61 54 42.835286016   9.56 9.03     ApSrEu 83 0

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