2024ApJ...970L..30X

Query : 2024ApJ...970L..30X

2024ApJ...970L..30X - Astrophys. J., 970, L30 (2024/August-1)

Discovery of an Extremely r-process-enhanced Thin-disk Star with [Eu/H] = +0.78.

XIE X.-J., SHI J., YAN H.-L., CHEN T.-Y., ALLENDE PRIETO C., BEERS T.C., LIU S., LI C.-Q., DING M.-Y., TANG Y.-J., ZHANG R. and XIE R.

Abstract (from CDS):

Highly r-process-enhanced (RPE) stars are rare and usually metal poor ([Fe/H] < -1.0), and they mainly populate the Milky Way halo and dwarf galaxies. This study presents the discovery of a relatively bright (V = 12.72), highly RPE (r-II) star ([Eu/Fe] = +1.32, [Ba/Eu] = -0.95), LAMOST J020623.21+494127.9. This star was selected from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope medium-resolution (R ∼ 7500) spectroscopic survey; follow-up high-resolution (R ∼ 25,000) observations were conducted with the High Optical Resolution Spectrograph installed on the Gran Telescopio Canarias. The stellar parameters (Teff = 4130 K, $\mathrm{log}\,{\rm{g}}$ = 1.52, [Fe/H] = -0.54, ξ = 1.80 km s–1) have been inferred taking into account nonlocal thermodynamic equilibrium effects. The abundances of [Ce/Fe], [Pr/Fe], and [Nd/Fe] are +0.19, +0.65, and +0.64, respectively, relatively low compared to the Solar r-process pattern normalized to Eu. This star has a high metallicity ([Fe/H] = -0.54) compared to most other highly RPE stars and has the highest measured abundance ratio of Eu to H ([Eu/H] = +0.78). It is classified as a thin-disk star based on its kinematics and does not appear to belong to any known stream or dwarf galaxy.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Stellar abundances - Fundamental parameters of stars - Chemically peculiar stars

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 81

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Number of rows : 81
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 BPS CS 31070-0073 * 00 08 51.8222589480 +05 26 17.098123380   15.007 14.398 14.243 13.903 ~ 8 0
2 TYC 5841-127-1 Pe* 00 10 17.5934312016 -17 35 38.898139920   11.80 11.28     ~ 12 0
3 BPS CS 29497-0004 Pe* 00 28 06.9155612016 -26 03 04.269055032   14.76 14.07 13.583 13.116 ~ 64 0
4 BD-11 160 Pe* 00 51 26.4575167968 -10 53 17.293215372   11.22 10.81     ~ 28 0
5 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
6 LAMOST J020632.21+494127.9 * 02 06 32.1877413151 +49 41 27.978053694           ~ 5 0
7 BPS CS 22958-0052 Pe* 02 12 48.2200420128 -56 29 08.292994080   14.61 14.24 14.33   ~ 15 0
8 UCAC2 676047 Pe* 02 16 57.1640931288 -75 47 06.581963508   12.974 11.937 11.71 10.69 CEMP 16 0
9 2MASS J02383555-3444024 RG* 02 38 35.5497063384 -34 44 02.616618768   20.190 18.47   16.96 ~ 9 0
10 [LDH2014] Fnx-mem0556 RG* 02 38 45.5685554664 -34 41 45.309482916   20.159 18.666   17.171 ~ 5 0
11 2MASS J02384635-3441147 RG* 02 38 46.3487515392 -34 41 14.899686648   20.132 18.62   17.25 ~ 7 0
12 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
13 UCAC2 26140348 Pe* 02 46 20.1351143184 -15 18 41.856499728   13.20 12.44 12.30 11.44 CEMP 20 0
14 SMSS J024858.41-684306.4 Pe* 02 48 58.4472379200 -68 43 06.218230548           ~ 13 0
15 BPS CS 31079-0028 Pe* 03 01 00.6866893176 +06 16 31.808500140   13.900 13.211 12.713 12.190 ~ 39 0
16 ATO J046.9122-05.0469 LP? 03 07 38.9298696543 -05 02 49.106419468   14.443 12.928 12.509   ~ 7 0
17 HE 0324-0122 Pe* 03 27 02.2874129448 +01 32 32.406609948   12.866 12.140 11.934   ~ 15 0
18 BPS CS 29526-0110 Pe* 03 27 43.6392396600 -23 00 29.924362260   13.71 13.35 13.116 12.834 CEMP-r/s 54 0
19 DES J033447.93-540525.0 Pe* 03 34 47.9500542384 -54 05 24.970508448           ~ 14 0
20 [WMO2015] 129 RG* 03 34 57.5852522640 -54 05 31.339557060           ~ 17 0
21 [KCB2015] Reti 4 RG* 03 35 23.8544722128 -54 04 07.586442660           ~ 29 0
22 [WMO2015] 115 RG* 03 35 31.1536864104 -54 01 48.157854492           ~ 17 0
23 [WMO2015] 35 RG* 03 35 37.0733902248 -54 04 01.174004400           ~ 15 0
24 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 375 0
25 DES J033556.28-540316.3 RG* 03 35 56.2923112560 -54 03 16.203729492           ~ 12 0
26 [KCB2015] Reti 18 RG* 03 36 07.7638135488 -54 02 35.507879592           ~ 21 0
27 CPD-65 261 Pe* 03 42 28.1663475648 -65 00 35.605828368   11.847 11.048     ~ 12 0
28 UCAC2 30631766 Pe* 04 06 18.2370188352 -03 05 24.759100068   13.139 12.171 12.09 11.16 CEMP 13 0
29 HE 0430-4901 Pe* 04 31 31.1369700144 -48 54 41.518597500     14.572   13.770 CEMP-s 17 0
30 HE 0432-0923 Pe* 04 34 25.6711921824 -09 16 50.513595636     15.165   14.140 ~ 16 0
31 2MASS J05241392-0336543 LP* 05 24 13.9298188632 -03 36 54.303249888           ~ 11 0
32 CD-59 1105 Pe* 05 38 32.9565917352 -59 04 28.110891720   10.25 9.887     F5ep 15 0
33 SMSS J062609.83-590503.2 Pe* 06 26 09.8286518496 -59 05 03.067000260           ~ 8 0
34 TYC 9186-44-1 Pe* 07 10 31.1239810848 -71 21 52.269583140   11.797 10.886     ~ 15 0
35 UCAC4 278-016017 Pe* 07 11 42.5268995832 -34 32 36.899012112   13.421 12.444 12.259   CEMP 9 0
36 TYC 7111-718-1 Pe* 07 20 22.5341817768 -33 58 51.882019212   11.61 10.80     CEMP 11 0
37 UCAC4 490-054409 Pe* 11 09 01.2240768416 +07 54 41.781589660   13.361 12.403 12.197   ~ 19 0
38 LAMOST J112456.61+453531.3 * 11 24 56.6106775656 +45 35 31.306337916           ~ 13 0
39 HE 1127-1143 Pe* 11 29 50.6275439136 -12 00 12.581828208     15.885 15.434 15.002 ~ 17 0
40 2MASS J12170829+0415146 Pe* 12 17 08.2865209964 +04 15 14.565498261           ~ 12 0
41 HE 1219-0312 Pe* 12 21 34.1430245160 -03 28 39.636260184     15.940   15.043 ~ 50 0
42 HE 1226-1149 Pe* 12 29 28.0353121008 -12 06 14.150700612   15.415 14.798 14.470   ~ 7 0
43 BPS BS 16929-0005 Pe* 13 03 29.4751261824 +33 51 09.242978436 14.109 14.228 13.610 13.208 12.766 CEMP-no 41 0
44 UCAC4 392-055956 Pe* 13 05 21.3746981808 -11 37 22.078035876   14.305 13.370 13.350   CEMP 15 0
45 GrW 170817 GWE 13 09 48.0850 -23 22 53.343           ~ 2683 0
46 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2417 1
47 2MASS J14244532-2542471 Pe* 14 24 45.3307357527 -25 42 47.160966738           ~ 8 0
48 TYC 7814-133-1 Pe* 14 32 53.3360210280 -41 25 49.477241028   11.76 11.08     ~ 15 0
49 2MASS J14534137+0040467 Pe* 14 53 41.3850769450 +00 40 46.749390235           ~ 6 0
50 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
51 2MASS J15095862+6716200 RB? 15 09 58.6103318448 +67 16 20.032584024   18.53 17.006   15.614 ~ 41 0
52 TYC 7325-920-1 HB* 15 21 39.9538571520 -35 38 09.321499716   12.940 12.269 12.225 11.343 CEMP 22 0
53 HE 1523-0901 Pe* 15 26 01.0697532504 -09 11 38.885639784   12.37 11.50 10.476 9.863 CEMP 93 0
54 TYC 6189-285-1 Pe* 15 38 30.8456260680 -18 04 24.290986440   11.725 10.864 10.58 10.529 CEMP 25 0
55 SMSS J155430.57-263904.8 Pe* 15 54 30.5656512240 -26 39 04.811772168           ~ 5 0
56 UCAC2 1423411 Pe* 17 22 57.4043041968 -71 23 00.029012640   13.813 12.925 12.73 11.83 ~ 15 0
57 SMSS J175046.30-425506.9 Pe* 17 50 46.3020549192 -42 55 06.980208600           ~ 7 0
58 SMSS J175738.37-454823.5 Pe* 17 57 38.3678171352 -45 48 23.497711236           ~ 7 0
59 UCAC2 13007354 Pe* 18 02 42.2736456576 -44 04 42.648519648   13.851 12.621 12.30 11.26 CEMP 19 0
60 UCAC4 280-194510 Pe* 18 31 28.3853962584 -34 10 16.645175832   14.66 13.54 13.26   ~ 5 0
61 UCAC2 17589354 Pe* 18 32 25.3727482992 -33 49 43.146570576       15.45   ~ 5 0
62 TYC 8764-1992-1 Pe* 19 16 18.2200707336 -55 44 45.396079728   12.643 11.447     CEMP 20 0
63 UCAC4 728-064676 * 19 57 08.0613321288 +55 29 49.136865468   14.120 13.188 12.949   ~ 9 0
64 UCAC2 17391823 Pe* 20 09 33.9473949192 -34 10 27.350325408   12.67 11.769 11.52 10.21 ~ 12 0
65 BPS CS 22885-0096 Pe* 20 20 51.1730095656 -39 53 30.234972840   14.02 13.33     CEMP-no 96 0
66 UCAC2 31779418 Pe* 20 38 43.1848979784 -00 23 32.761814352   13.726 12.731 12.51 11.57 CEMP 34 0
67 UCAC2 2203606 Pe* 21 06 42.9488737416 -68 28 26.703682860   13.499 12.799 12.74 11.91 CEMP 18 0
68 HD 358246 Pe* 21 09 18.2497595112 -13 10 06.201527160   11.564 10.705     CEMP 16 0
69 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
70 2MASS J21300090+1208571 RG* 21 30 00.9013777728 +12 08 57.080615748   14.319 12.874     ~ 43 0
71 TYC 8444-76-1 * 22 13 20.4894810480 -51 37 38.689403592   12.223 11.630     ~ 15 0
72 BPS CS 22892-0052 Pe* 22 17 01.6558764360 -16 39 27.051026544   14.03 13.20 13.06 12.19 KIIvw 472 0
73 2MASS J22182082-3827554 Pe* 22 18 20.8318448784 -38 27 55.460957580   14.0 13.4     ~ 7 0
74 HE 2224+0143 Pe* 22 27 23.1215289240 +01 58 33.066485508   14.54 13.83 13.208 12.733 ~ 23 0
75 BPS CS 29491-0069 Pe* 22 31 02.1859040712 -32 38 36.526573572   13.72 13.1 12.654 12.175 ~ 43 0
76 BPS CS 22945-0017 Pe* 23 20 55.6277405064 -63 15 36.786796848   14.83 14.44 14.50   ~ 30 0
77 HE 2327-5642 Pe* 23 30 37.0896973176 -56 26 14.385030648   14.590 13.881 13.425 12.948 ~ 51 0
78 UCAC4 170-210771 Pe* 23 36 22.0259542968 -56 07 49.766385252   14.133   12.644   CEMP 16 0
79 HD 222925 Pe* 23 45 17.6074777008 -61 54 42.835286016   9.56 9.03     ApSrEu 83 0
80 BPS CS 22945-0058 Pe* 23 52 37.7929807392 -66 05 01.669636500   15.32 14.96     ~ 14 0
81 LP 584-32 Pe* 23 57 18.9066974952 -00 52 47.436045024   16.366 15.636 15.141 14.673 F5 35 0

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