2023ApJ...953..143F

Query : 2023ApJ...953..143F

2023ApJ...953..143F - Astrophys. J., 953, 143 (2023/August-3)

The Metal-weak Milky Way Stellar Disk Hidden in the Gaia-Sausage-Enceladus Debris: The APOGEE DR17 View.

FELTZING S. and FEUILLET D.

Abstract (from CDS):

We have for the first time identified the early stellar disk in the Milky Way by using a combination of elemental abundances and kinematics. Using data from APOGEE DR17 and Gaia we select stars in the Mg-Mn-Al-Fe plane with elemental abundances indicative of an accreted origin and find stars with both halo-like and disk-like kinematics. The stars with halo-like kinematics lie along a lower sequence in [Mg/Fe], while the stars with disk-like kinematics lie along a higher sequence. Combined with astroseismic observations, we determine that the stars with halo-like kinematics are old, 9-11 Gyr, and that the more evolved stellar disk is about 1-2 Gyr younger. We show that the in situ fraction of stars on deeply bound orbits is not small, in fact the inner Galaxy likely harbors a genuine in situ population together with an accreted one. In addition, we show that the selection of the Gaia-Sausage-Enceladus in the En-Lz plane is not very robust. In fact, radically different selection criteria give almost identical elemental abundance signatures for the accreted stars.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Milky Way Galaxy - Milky Way formation - Milky Way stellar halo - Milky Way disk - Milky Way evolution

Simbad objects: 47

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Number of rows : 47
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 15-940-1 RG* 00 56 47.7204380520 +04 28 20.215520436   12.35 11.31     ~ 11 0
3 UCAC4 457-001461 RG* 01 07 27.0268727773 +01 19 27.556004636   13.933 12.932 12.897   ~ 12 0
4 2MASS J01274797+0158590 RG* 01 27 47.9833739664 +01 58 59.127476646           ~ 15 0
5 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
6 2MASS J04105216+2300136 RG* 04 10 52.1604014177 +23 00 13.493697460           ~ 12 0
7 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
8 2MASS J13075454-0338132 RG* 13 07 54.5351901240 -03 38 13.219736388           ~ 15 0
9 2MASS J13432480-1735312 RG* 13 43 24.8046209328 -17 35 31.363919412           ~ 20 0
10 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
11 * 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
12 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
13 2MASS J16125070-1929094 Pe* 16 12 50.7019067099 -19 29 09.508884968           ~ 7 0
14 UCAC4 336-082319 RG* 16 21 20.3227584792 -22 53 03.791053788   15.806 14.134 13.702 11.892 ~ 18 0
15 2MASS J16564342-2052105 HB* 16 56 43.4217603648 -20 52 10.681985568           ~ 16 0
16 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
17 UCAC4 666-070198 RG* 18 47 15.8474137896 +43 09 32.559618996   13.590 12.661 12.408   ~ 17 0
18 UCAC4 674-067687 RG* 18 58 32.3930174928 +44 40 36.236606556   14.087 13.138 12.995   G5V: 20 0
19 UCAC4 659-068665 RG* 18 58 52.7206633008 +41 40 33.625905672   14.158 12.868 12.510   K5II 19 0
20 UCAC4 669-069911 RG* 19 05 18.6057011496 +43 46 06.830601348   14.603 13.359 13.051   ~ 25 0
21 UCAC4 647-065282 RG* 19 10 11.8634527272 +39 17 18.057293592       12.876   ~ 24 0
22 2MASS J19142029+5055317 Pe* 19 14 20.3010023928 +50 55 31.730941344           G0 15 0
23 UCAC4 708-064339 HB* 19 15 59.8675976376 +51 29 20.587136352   13.678   12.497   ~ 25 0
24 TYC 3546-417-1 RG* 19 16 02.7435915360 +47 35 39.076414836   11.92 11.08     G5III-IVp 20 0
25 TYC 3125-670-1 RG* 19 17 55.5882379296 +40 56 47.697186804   11.75 10.77     G9III 29 0
26 2MASS J19194214-2820536 * 19 19 42.1456404271 -28 20 53.712932145           ~ 11 0
27 2MASS J19211698-2804419 RG* 19 21 16.9823778585 -28 04 41.974883151           ~ 13 0
28 UCAC4 640-067259 * 19 21 46.3318001520 +37 51 52.355285820   14.695 13.624 13.371   ~ 9 0
29 2MASS J19215102-2845452 * 19 21 51.0322899743 -28 45 45.358142392           ~ 9 0
30 2MASS J19220928-2907366 RG* 19 22 09.2860801678 -29 07 36.751563376           ~ 14 0
31 2MASS J19221874-2920013 RG* 19 22 18.7434709714 -29 20 01.386283777           ~ 11 0
32 TYC 3555-744-1 HB* 19 22 37.0100121216 +50 39 41.390319312   11.98 10.81     ~ 27 0
33 2MASS J19225967+4548488 RG* 19 22 59.6758555776 +45 48 48.874276656           ~ 23 0
34 UCAC4 639-066934 RG* 19 24 36.5827205136 +37 41 00.593538252   14.755 13.654 13.342   K1III 16 0
35 UCAC4 654-072226 HB* 19 25 24.5513465688 +40 36 48.466577916   12.797 11.992 11.755   G3IV 29 0
36 UCAC4 687-068733 RG* 19 26 10.9795472328 +47 12 21.233845116   13.354 12.296 12.029   ~ 18 0
37 UCAC4 638-070610 HB* 19 30 25.1198301000 +37 30 44.684503488   14.262 13.272 13.007   ~ 24 0
38 UCAC4 675-074334 Pe* 19 34 53.4204635088 +44 52 06.238475472   13.802 12.893 12.694   HBstar 15 0
39 UCAC4 653-076784 RG* 19 37 07.1927979816 +40 35 21.979493952   13.921 12.818 12.481   ~ 32 0
40 UCAC4 700-071163 RG* 19 48 35.2707017376 +49 59 57.864177312   14.786 13.642 13.382   ~ 16 0
41 UCAC4 669-077820 RG* 19 48 35.8659777096 +43 39 47.179160892   14.195 13.119 12.825   ~ 25 0
42 BD-05 5766 PM* 22 20 58.6891034208 -04 32 15.593150688   11.04 10.39     ~ 8 0
43 UCAC2 26132301 HB* 22 23 42.5492810496 -15 38 45.940878564   14.044 13.032 12.93 11.99 ~ 16 0
44 UCAC4 376-178492 RG* 22 39 57.8206560792 -14 53 20.264811612   13.555 12.717 12.689   ~ 15 0
45 NAME Local Group GrG ~ ~           ~ 9325 0
46 NAME Galactic Bulge reg ~ ~           ~ 4794 0
47 NAME Gaia Enceladus-Sausage St* ~ ~           ~ 860 0

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