2022MNRAS.513.1557C

Query : 2022MNRAS.513.1557C

2022MNRAS.513.1557C - Mon. Not. R. Astron. Soc., 513, 1557-1580 (2022/June-3)

The detailed chemical abundance patterns of accreted halo stars from the optical to infrared.

CARRILLO A., HAWKINS K., JOFRE P., DE BRITO SILVA D., DAS P. and LUCEY M.

Abstract (from CDS):

Understanding the assembly of our Galaxy requires us to also characterize the systems that helped build it. In this work, we accomplish this by exploring the chemistry of accreted halo stars from Gaia-Enceladus/Gaia-Sausage (GES) selected in the infrared from the Apache Point Observatory Galactic Evolution Experiment (APOGEE) Data Release 16. We use high resolution optical spectra for 62 GES stars to measure abundances in 20 elements spanning the α, Fe-peak, light, odd-Z, and notably, the neutron-capture groups of elements to understand their trends in the context of and in contrast to the Milky Way and other stellar populations. Using these derived abundances we find that the optical and the infrared abundances agree to within 0.15 dex except for O, Co, Na, Cu, and Ce. These stars have enhanced neutron-capture abundance trends compared to the Milky Way, and their [Eu/Mg] and neutron-capture abundance ratios (e.g. [Y/Eu], [Ba/Eu], [Zr/Ba], [La/Ba], and [Nd/Ba]) point to r-process enhancement and a delay in s-process enrichment. Their [α/Fe] trend is lower than the Milky Way trend for [Fe/H] > -1.5 dex, similar to previous studies of GES stars and consistent with the picture that these stars formed in a system with a lower rate of star formation. This is further supported by their depleted abundances in Ni, Na, and Cu abundances, again, similar to previous studies of low-α stars with accreted origins.

Abstract Copyright: © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): stars: abundances - Galaxy: abundances - Galaxy: formation - Galaxy: halo

VizieR on-line data: <Available at CDS (J/MNRAS/513/1557): main.dat targets.dat abund.dat nlte.dat>

Simbad objects: 66

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Number of rows : 66
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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 TYC 4686-2039-1 RG* 01 57 52.9787646984 -03 16 50.865596940   12.273 11.204     ~ 16 0
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
4 TYC 2990-731-1 RG* 09 12 17.6054919024 +44 08 56.349608964   12.48 11.83 11.9   ~ 10 0
5 TYC 2507-938-1 RG* 09 38 18.3536329368 +37 06 17.394747264   12.32 11.08     ~ 14 0
6 TYC 3006-758-1 RG* 10 01 34.1842468008 +43 45 55.846586628   12.58 11.36     ~ 9 0
7 TYC 2511-263-1 RG* 10 31 35.8742545728 +30 10 19.827697980   12.69 11.79     G3 14 0
8 TYC 3012-621-1 RG* 11 05 51.4757980056 +43 25 07.795986456   13.61 11.81     ~ 10 0
9 TYC 3444-352-1 RG* 11 11 57.2774183784 +45 51 08.610114204   12.29 11.10     ~ 11 0
10 HD 233825 Pe* 11 19 34.4223486384 +49 57 22.384603368   11.26 10.47     K 9 0
11 TYC 1439-1168-1 RG* 11 27 29.5350146064 +21 30 38.820571272   12.60 11.72     ~ 7 0
12 TYC 3452-1857-1 RG* 11 38 24.3287750904 +46 07 09.009951996   13.21 12.28     ~ 10 0
13 UCAC4 448-053514 RG* 11 48 22.0564529472 -00 30 31.751583840   12.295 11.344 11.189   ~ 13 0
14 TYC 1443-598-1 Pe* 11 54 42.3273080784 +19 34 05.343989736   12.83 11.81     ~ 9 0
15 NGP 47 88 RG* 12 07 15.6143203080 +46 22 12.587858040   12.86 11.35     G8 8 0
16 TYC 3455-1762-1 Pe* 12 16 12.5104406184 +45 57 06.352486164   11.66 10.92     ~ 5 0
17 UCAC4 440-054504 Pe* 12 20 43.9980727416 -02 04 31.517667300   13.336 12.034 11.811   ~ 10 0
18 BD+29 2356 RG* 13 01 52.4291777760 +29 11 17.936259972   12.27 11.50     ~ 33 0
19 TYC 1454-4-1 RG* 13 14 13.9082400312 +18 17 48.808133052   11.9 11.8     ~ 10 0
20 TYC 1462-208-1 RG* 13 39 38.8875426528 +18 36 03.123747468   12.93 11.68     ~ 14 0
21 TYC 2009-747-1 Pe* 13 58 15.7251529632 +26 02 12.146625780   12.28 11.26     ~ 10 0
22 * 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
23 TYC 3472-559-1 RG* 14 18 15.6266073216 +46 51 58.068565848   11.93 11.41     ~ 10 0
24 TYC 4983-775-1 HB* 14 21 08.5794422568 -05 15 39.392291412   11.86 11.06     ~ 10 0
25 TYC 1478-659-1 RG* 14 53 08.7214462824 +16 11 04.053153840   12.26 11.30     ~ 16 0
26 TYC 3050-1132-1 RG* 14 53 41.3726828160 +43 04 35.257416708   12.30 11.32     ~ 9 0
27 BD+43 2442 RG* 14 53 45.6693648360 +42 49 00.860697048   11.32 10.25     K0 12 0
28 2MASS J14572373+3051396 RG* 14 57 23.7391811664 +30 51 39.705005412           ~ 9 0
29 TYC 2017-29-1 RG* 15 03 51.2051720448 +22 35 31.052145408   11.98 10.97     ~ 12 0
30 HD 234203 RG* 15 04 39.7268487048 +49 32 00.585319416   10.89 10.00     G0 13 0
31 TYC 2565-1094-1 RG* 15 05 28.8407506536 +32 34 14.064735756   13.31 11.61     ~ 10 0
32 TYC 5002-316-1 RG* 15 18 03.6927364680 -00 38 52.070884620   11.4 10.2     ~ 13 0
33 TYC 2571-870-1 Pe* 15 41 09.5305689696 +30 14 06.856916640   12.57 11.12     ~ 8 0
34 TYC 3053-1575-1 RG* 15 45 44.2382748384 +38 21 27.438134652   12.03 11.01     ~ 10 0
35 TYC 3490-72-1 RG* 15 56 17.5663940184 +47 03 28.071699012   12.03 11.25     ~ 9 0
36 CD-23 12603 Y*? 15 58 26.6239209552 -23 50 20.605277292           ~ 16 0
37 UCAC4 326-079903 Pe* 16 04 28.3131680142 -24 53 32.737192639   14.757 13.428 13.199   ~ 7 0
38 UCAC4 337-078245 Pe* 16 06 45.6208057170 -22 47 44.690727819   14.194 13.178 12.973   ~ 6 0
39 BD+47 2324 RG* 16 15 39.1549643592 +47 12 52.969774824   11.78 10.42     ~ 12 0
40 TYC 3078-740-1 SB* 16 40 43.4910679344 +42 55 03.751041216   11.89 11.09     ~ 9 0
41 TYC 3078-534-1 RG* 16 44 56.4466096464 +42 30 26.416414296   11.98 10.87     ~ 12 0
42 TYC 2603-1729-1 RG* 17 09 58.6189724400 +35 44 04.139520000   12.61 11.41     ~ 11 0
43 TYC 8729-1868-1 RG* 17 39 52.5084252408 -53 39 11.289028644 10.61 12.37 11.53     ~ 11 0
44 2MASS J17403522-5339428 RG* 17 40 35.2305474600 -53 39 42.990627852   12.677 11.729     ~ 11 0
45 TYC 3540-1495-1 RG* 18 45 14.5391135640 +46 42 00.641475612   11.67 10.66     ~ 12 0
46 UCAC4 687-064947 RG* 18 53 41.2552345128 +47 20 23.748948132   12.881 11.560 11.254   G8III 13 0
47 Cl* NGC 6752 CBG 38673 RG* 19 10 04.2589116936 -59 55 20.992735956   14.519 13.688     ~ 12 0
48 NGC 6752 3 RG* 19 10 43.7198620272 -60 01 03.970293528   13.07 11.97     ~ 23 0
49 UCAC4 149-213257 RG* 19 11 03.9834238969 -60 14 30.996629150   13.963 13.072 12.943   ~ 7 0
50 Cl* NGC 6752 CBG 29686 RG* 19 11 04.3502282856 -59 54 15.185627316   14.464 13.629     ~ 11 0
51 UCAC2 5473126 RG* 19 11 16.2131778000 -60 12 40.386030084   13.12 12.049 11.81 10.78 ~ 12 0
52 TYC 3133-494-1 RG* 19 11 17.6519023128 +43 59 07.292365224   12.19 11.31     G5V: 11 0
53 Cl* NGC 6752 CS 122 RG* 19 11 41.0002922112 -59 57 06.719207544   13.73 12.739     ~ 15 0
54 Cl* NGC 6752 CBG 3039 RG* 19 11 44.8308723840 -59 52 30.453358368   14.909 14.095     ~ 13 0
55 UCAC4 151-219656 RG* 19 12 04.3346892543 -59 51 55.074578441   15.227 14.461 14.344   ~ 6 0
56 TYC 3134-1683-1 RG* 19 22 06.7518173880 +38 09 10.404604260   12.69 11.08     G8III 13 0
57 TYC 3543-435-1 RG* 19 29 06.4578119184 +46 14 59.206039404   10.47 9.75     F8 10 0
58 TYC 3564-630-1 RG* 19 37 12.0103216392 +50 24 55.585764540   11.27 10.44     G0 29 0
59 UCAC4 366-185238 Pe* 22 13 21.2014677003 -16 50 17.879697608     12.304 12.184   ~ 6 0
60 UCAC2 28297823 Pe* 22 15 46.5068009616 -10 17 12.386403348   12.930 11.52 11.26 10.13 ~ 9 0
61 UCAC4 373-186562 Pe* 22 24 42.3805575996 -15 26 19.296322800   15.231   13.935   ~ 7 0
62 TYC 574-1356-1 Pe* 22 42 11.2416319656 +06 06 38.960347536   11.73 11.00     ~ 6 0
63 TYC 2756-1469-1 Pe* 23 19 56.6143105152 +33 00 34.399127088   12.72 11.87     ~ 3 0
64 2MASS J23580192-2050026 RG* 23 58 01.9374794557 -20 50 02.575924964           ~ 7 0
65 UCAC2 24501061 RG* 23 58 37.1965295544 -19 20 30.642610488   13.568 12.315 12.01 11.00 ~ 11 0
66 NAME Gaia Enceladus-Sausage St* ~ ~           ~ 860 0

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