2019A&A...623A.128H


Query : 2019A&A...623A.128H

2019A&A...623A.128H - Astronomy and Astrophysics, volume 623A, 128-128 (2019/3-1)

Abundances and kinematics of carbon-enhanced metal-poor stars in the Galactic halo. A new classification scheme based on Sr and Ba.

HANSEN C.J., HANSEN T.T., KOCH A., BEERS T.C., NORDSTROM B., PLACCO V.M. and ANDERSEN J.

Abstract (from CDS):

Carbon-enhanced metal-poor (CEMP) stars span a wide range of stellar populations, from bona fide second-generation stars to later-forming stars that provide excellent probes of binary mass transfer and stellar evolution. Here we analyse 11 metal-poor stars (8 of which are new to the literature), and demonstrate that 10 are CEMP stars. Based on high signal-to-noise ratio (S/N) X-shooter spectra, we derive abundances of 20 elements (C, N, O, Na, Mg, Ca, Sc, Ti, Cr, Mn, Fe, Ni, Sr, Y, Ba, La, Ce, Pr, Nd, and Eu). From the high-S/N spectra, we were able to trace the chemical contribution of the rare earth elements (REE) from various possible production sites, finding a preference for metal-poor low-mass asymptotic giant branch (AGB) stars of 1.5M in CEMP-s stars, while CEMP-r/s stars may indicate a more massive AGB contribution (2-5M). A contribution from the r-process - possibly from neutron star-neutron star mergers (NSM) - is also detectable in the REE stellar abundances, especially in the CEMP-r/s sub-group rich in both slow(s) and rapid(r) neutron-capture elements. Combining spectroscopic data with Gaia DR2 astrometric data provides a powerful chemodynamical tool for placing CEMP stars in the various Galactic components, and classifying CEMP stars into the four major elemental-abundance sub-groups, which are dictated by their neutron-capture element content. The derived orbital parameters indicate that all but one star in our sample (and the majority of the selected literature stars) belong to the Galactic halo. These stars exhibit a median orbital eccentricity of 0.7, and are found on both prograde and retrograde orbits. We find that the orbital parameters of CEMP-no and CEMP-s stars are remarkably similar in the 98 stars we study. A special case is the CEMP-no star HE 0020-1741, with very low Sr and Ba content, which possesses the most eccentric orbit among the stars in our sample, passing close to the Galactic centre. Finally, we propose an improved scheme to sub-classify the CEMP stars, making use of the Sr/Ba ratio, which can also be used to separate very metal-poor stars from CEMP stars. We explore the use of [Sr/Ba] versus [Ba/Fe] in 93 stars in the metallicity range -4.2≤[Fe/H]< -2. We show that the Sr/Ba ratio can also be successfully used for distinguishing CEMP-s, CEMP-r/s, and CEMP-no stars. Additionally, the Sr/Ba ratio is found to be a powerful astro-nuclear indicator, since the metal-poor AGB stars exhibit very different Sr/Ba ratios compared to fast-rotating massive stars and NSM, and is also reasonably unbiased by NLTE and 3D corrections.

Abstract Copyright: © C. J. Hansen et al. 2019

Journal keyword(s): stars: abundances - stars: carbon - stars: kinematics and dynamics - stars: Population II - Galaxy: halo - nuclear reactions, nucleosynthesis, abundances

VizieR on-line data: <Available at CDS (J/A+A/623/A128): tablea1.dat tablea2.dat>

Simbad objects: 100

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Number of rows : 100
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 HE 2358-4640 Pe* 00 00 50.9112333552 -46 23 31.346424996   14.3       CEMP-mp 5 0
2 HE 0002-1037 Pe* 00 05 23.0071596768 -10 20 24.702251820   14.74 13.68 13.59   CEMP-rs 7 0
3 HE 0010-3422b Pe* 00 13 09.0111711576 -34 05 54.931965900   15.577 15.482 15.403 15.303 CEMP-r 4 1
4 HE 0017+0055 Pe* 00 20 21.6000581352 +01 12 06.817571136   12.991 11.66 10.773 10.186 CEMP-rs 24 0
5 2MASS J00224486-1724290 Pe* 00 22 44.8620794952 -17 24 29.140962984   13.824 12.887     CEMP-no 20 0
6 BPS CS 29527-0015 Pe* 00 29 10.6814565504 -19 10 07.305102624   14.61 14.24     CEMP-no 56 0
7 SKB 2 Pe* 00 41 39.8197621944 -26 18 54.460585116   13.338 12.221 11.704 11.321 CEMP-s 89 0
8 CD-26 304 SB* 00 57 18.1374361752 -25 26 09.696130944   13.57 12.69 12.198 11.759 CEMP-s 71 1
9 BPS CS 22166-0016 Pe* 00 58 23.8415767344 -14 47 06.878622912   13.34 12.75 12.324 11.898 CEMP-no 22 0
10 HE 0059-6540 Pe* 01 01 18.1549967400 -65 23 56.383503936   14.26   13.19   CEMP-rs 3 0
11 HE 0058-3449 Pe* 01 01 21.7177096224 -34 33 10.608290676   13.9 13.199 12.780 12.377 CEMP-s 6 0
12 HE 0100-1622 Pe* 01 02 58.4692524792 -16 06 30.953500992   16.659 15.822 15.370 14.940 CEMP-no 8 0
13 HE 0109-4510 Pe* 01 12 08.1059580840 -44 54 16.461762336   16.530 16.007 15.639 15.227 CEMP-mp 5 0
14 SKB 5 SB* 01 13 46.4934118488 -13 30 48.980956752   14.0 12.5 11.857 11.361 CEMP-s 18 1
15 HE 0134-1519 Pe* 01 37 05.3770192032 -15 04 22.792608336   14.937 14.474 14.018 13.683 CEMP-no 15 0
16 HE 0151-6007 Pe* 01 53 36.4503753192 -59 53 05.390987316   15.08 13.50   12.177 CEMP-rs 4 0
17 HE 0151-0341 SB* 01 53 43.3049091528 -03 27 14.456628576   14.67 13.40   12.521 CEMP-rs 9 0
18 HE 0206-1916 Pe* 02 09 19.6321025088 -19 01 55.451633016   15.133 13.999 13.458 12.987 CEMP-s 21 0
19 HE 0219-1739 Pe* 02 21 41.2958950176 -17 25 37.031081124   15.85 14.10 14.035 13.444 CEMP-no 9 0
20 HE 0221-3218 Pe* 02 24 03.9522407208 -32 04 57.675410976   17.01 15.60     CEMP-mp 3 0
21 BD+44 493 Pe* 02 26 49.7390353632 +44 57 46.523771136   9.63 9.11     CEMP-no 100 0
22 HE 0233-0343 Pe* 02 36 29.7931635456 -03 30 06.029112888   15.867 15.430 15.171 14.818 CEMP-no 31 0
23 HE 0241-3512 Pe* 02 43 26.7740293632 -35 00 12.129681528   15.17 14.00 13.305 12.773 CEMP-s 6 0
24 HE 0243-3044 Pe* 02 45 16.4464212312 -30 32 02.118309504   17.11 16.10     CEMP-rs 9 0
25 HE 0253-6024 Pe* 02 55 06.4464459168 -60 12 16.739351172   15.10 13.50   11.992 CEMP-s 5 0
26 HE 0317-4705 Pe* 03 18 45.2582795640 -46 54 39.574798200   13.71 12.55 12.41   CEMP-rs 3 0
27 HE 0319-0215 SB* 03 21 46.2603171576 -02 04 33.952124424   15.03 13.60   12.603 CEMP-rs 12 0
28 HE 0400-2030 Pe* 04 02 14.8021418088 -20 21 53.533679904   14.921 14.033 13.605 13.164 CEMP-s 19 0
29 HE 0408-1733 Pe* 04 11 06.0266169456 -17 25 39.745266096   13.511 12.335     CEMP-mp 10 0
30 HE 0411-3558 Pe* 04 13 09.0581958168 -35 50 38.815893420   13.33 12.96   12.352 CEMP-mp 24 0
31 HE 0430-4901 Pe* 04 31 31.1369700144 -48 54 41.518597500     14.572   13.770 CEMP-s 14 0
32 HE 0430-1609 Pe* 04 32 50.9240264664 -16 03 38.824888860   14.48 13.1 12.527 12.008 CEMP-s 12 0
33 HE 0440-3426 Pe* 04 42 08.1758822400 -34 21 13.869730368   12.88 11.44     CEMP-s 11 0
34 HE 0440-1049 Pe* 04 42 39.9456530544 -10 43 23.911882572   13.02 12.52 12.51   CEMP-no 12 0
35 HE 0441-0652 Pe* 04 43 29.8848378360 -06 46 53.520042180   15.250 14.228 13.678 13.106 CEMP-s 15 0
36 HE 0448-4806 Pe* 04 49 33.0494670384 -48 01 08.312761272   13.45 12.35     CEMP-s 8 0
37 HE 0450-4902 Pe* 04 51 43.2538838712 -48 57 25.202919240   16.23 15.84 15.90   CEMP-s 7 0
38 HE 0507-1653 SB* 05 09 16.5603215496 -16 50 04.688981556   13.633 12.507 12.002 11.579 CEMP-s 21 0
39 HE 0507-1430 Pe* 05 10 07.6176113760 -14 26 31.742234844   16.06 14.40 13.693 13.104 CEMP-s 10 0
40 HE 0516-2515 SB* 05 18 09.4817384592 -25 12 24.992694432   15.57 13.90 12.634 11.953 CEMP-no 7 0
41 HE 0854+0151 Pe* 08 57 30.5341958256 +01 39 50.446362528   15.907 14.983 14.501 14.071 CEMP-s 5 0
42 HE 0945-1435 Pe* 09 47 50.6778824184 -14 49 06.861774900   15.73 15.23 15.35   CEMP-mp 10 0
43 HE 0959-1424 Pe* 10 02 03.9095071440 -14 39 23.135883192   13.973 13.371 13.015 12.643 CEMP-s 8 0
44 HE 1012-1540 Pe* 10 14 53.4753516864 -15 55 53.172437448     14.04     CEMP-no 36 0
45 HE 1029-0546 Pe* 10 31 48.1191917592 -06 01 43.943123568   15.987 15.632 15.316   CEMP-s 9 0
46 HE 1031-0020 Pe* 10 34 24.2082300456 -00 36 08.378366148     14.30     CEMP-s 23 0
47 HE 1045+0226 Pe* 10 48 03.4066059720 +02 10 47.831885688   15.0 14.47     CEMP-s 8 0
48 HE 1046-1352 Pe* 10 48 29.9238143232 -14 08 11.828372532   15.390 14.714 14.309 13.879 CEMP-s 9 0
49 HE 1133-0555 Pe* 11 36 11.7638171376 -06 11 43.119652740   16.063 15.427 15.030 14.639 CEMP-no 6 0
50 HE 1150-0428 Pe* 11 53 06.6090188016 -04 45 03.485197944     14.91     CEMP-no 28 0
51 HE 1201-1512 Pe* 12 03 37.0449862176 -15 29 33.236334924   14.2       CEMP-no 19 0
52 HE 1218-1828 Pe* 12 21 19.3550434368 -18 45 34.974375300   16.832 16.339 16.089   CEMP-mp 4 0
53 C* 3289 C* 12 41 02.3989686024 -08 53 06.586709784     12.0   10.389 C 11 0
54 HE 1241-2907 Pe* 12 44 12.9747861960 -29 23 48.042681072   16.15 15.59 15.76   CEMP-mp 4 0
55 HE 1300+0157 Pe* 13 02 56.2443901392 +01 41 52.080457056   14.536 14.11 13.678 13.261 CEMP-no 43 0
56 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 35 0
57 HE 1300-0641 Pe* 13 03 34.1329557000 -06 57 20.869557192     14.804   13.929 CEMP-no 15 0
58 HE 1302-0954 Pe* 13 04 58.2130607664 -10 10 10.583620608   14.5       CEMP-no 6 0
59 HE 1310-0536 Pe* 13 13 31.1856437856 -05 52 12.533926152   15.055 14.347 13.829   CEMP-no 27 0
60 BPS CS 22877-0001 Pe* 13 13 55.3726775760 -12 11 41.666054388   12.78 12.38 11.695 11.218 CEMP-no 39 0
61 HE 1315-2035 Pe* 13 17 57.4877038128 -20 50 52.861703856   17.05 15.70 14.770 14.318 CEMP-s 6 0
62 HE 1327-2326 Pe* 13 30 05.9394958608 -23 41 49.699340844 13.761 14.01 13.55 13.50 12.803 CEMP-no 237 0
63 HE 1410+0213 Pe* 14 13 06.5623389120 +01 59 21.911258400   14.29 13.25 12.734 12.297 CEMP-no 22 0
64 HE 1418+0150 SB* 14 21 01.1688766320 +01 37 17.834854152   13.7 12.205 11.335 10.936 CEMP-s 12 0
65 UCAC4 430-058824 Pe* 14 32 26.0674730856 -04 00 30.889143180   14.445 13.646 13.609 12.693 CEMP-mp 10 0
66 HE 1430-0919 Pe* 14 33 12.8284426056 -09 32 52.661125032   15.26 13.80 13.669 13.197 CEMP-s 7 0
67 HE 1431-0245 Pe* 14 33 54.1499119320 -02 58 32.583788724   16.58 15.30   14.223 CEMP-s 6 0
68 BPS CS 30301-0015 Pe* 15 08 56.8432075560 +02 30 18.627466716   14.04 13.04   12.063 CEMP-s 45 0
69 HE 1506-0113 Pe* 15 09 14.2925716632 -01 24 56.730524328   15.4       CEMP-no 23 0
70 HE 1523-1155 Pe* 15 26 41.0446929408 -12 05 42.660193380   14.571 13.225 12.622 12.138 CEMP-s 19 0
71 LP 624-44 Pe* 16 11 05.0316275784 -01 47 08.465474220   12.480 11.758     CEMP-rs 9 0
72 BPS CS 22878-0027 Pe* 16 37 35.8437123792 +10 22 07.754788668   14.86 14.4 14.45   CEMP-no 25 0
73 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13686 0
74 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 2081 2
75 BPS CS 29498-0043 Pe* 21 03 52.1197651440 -29 42 50.344181712   14.8 13.72 13.013 12.406 CEMP-no 91 0
76 HE 2138-1616 Pe* 21 41 16.6096540440 -16 02 39.863733396   14.91 13.90     CEMP-mp 5 0
77 HE 2141-1441 Pe* 21 44 25.6762953072 -14 27 32.869448856   14.63 13.50     CEMP-mp 5 0
78 HE 2144-1832 SB* 21 46 54.6639160128 -18 18 15.587038476   12.651 10.97 10.471 9.860 CEMP-s 13 0
79 HE 2153-2323 Pe* 21 56 37.5847822872 -23 09 25.420064616   16.10 14.50   13.403 CEMP-s 8 1
80 2MASS J21584227-2029156 Pe* 21 58 42.2746240680 -20 29 15.746399232   14.1 13.156 12.692 12.225 CEMP-no 8 0
81 HE 2158-5134 Pe* 22 01 31.8889617744 -44 11 49.856208000   15.15 14.51 14.45   CEMP-s 4 1
82 HE 2159-0551 Pe* 22 02 16.3602355800 -05 36 48.534816816   13.3       CEMP-mp 13 0
83 HE 2201-0345 Pe* 22 03 57.5712740736 -03 30 54.064296864   15.36 14.1   13.140 CEMP-s 8 0
84 HE 2208-1239 Pe* 22 10 53.4450437784 -12 24 27.003628548   12.54 11.72 11.66   CEMP-rs 9 0
85 BPS CS 29502-0092 Pe* 22 22 35.9982138384 -01 38 27.620508552   12.64 11.87 11.365 10.862 CEMP-no 53 0
86 HE 2235-5058 Pe* 22 38 07.9560821352 -50 42 41.505459048   13.8       CEMP-s 6 0
87 HE 2238-4131 Pe* 22 41 22.6763861568 -41 15 57.317121540   17.05 16.10     CEMP-s 5 0
88 HE 2239-5019 Pe* 22 42 26.8476804960 -50 04 00.914721852   16.239 15.846 15.576 15.240 CEMP-mp 15 0
89 2MASS J22533969-4213038 Pe* 22 53 39.7110580176 -42 13 03.821675880   13.2 12.0     CEMP-no 7 0
90 HE 2258-4427 Pe* 23 00 54.3589175328 -44 11 26.927627208           CEMP-s 4 0
91 HE 2310-4523 Pe* 23 13 00.0416103048 -45 07 06.565285596   12.120 11.207 10.55   CEMP-mp 19 0
92 HE 2312-0758 Pe* 23 14 54.3699964968 -07 42 33.222551436   15.12 14.11 14.06 13.25 CEMP-s 4 0
93 HE 2318-1621 Pe* 23 21 21.5631300312 -16 05 05.628387156   13.38 12.73 12.67   CEMP-no 15 0
94 2MASS J23215820-5211431 Pe* 23 21 58.1901363600 -52 11 43.204631172   14.3       CEMP-no 10 0
95 HE 2323-0256 Pe* 23 26 29.8073738880 -02 39 58.036383180   15.12 14.36   13.358 CEMP-no 176 0
96 HE 2330-0555 Pe* 23 32 54.7971906912 -05 38 50.557732188   15.412 14.559 14.158 13.612 CEMP-s 16 0
97 HE 2331-7155 Pe* 23 34 36.1728318744 -71 38 50.939495232   14.73   13.82   CEMP-no 8 0
98 HE 2339-4240 Pe* 23 41 40.9352924280 -42 24 01.772703180   14.16 13.12 12.98   CEMP-s 3 0
99 HE 2356-0410 Pe* 23 59 13.1419841280 -03 53 48.220213560   14.39 13.60 13.164 12.713 CEMP-no 84 0
100 HE 2357-2718 Pe* 23 59 58.1284315416 -27 01 37.629391764   14.313 13.078     CEMP-mp 12 0

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2023.06.09-23:06:32

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