2018ApJ...852...50F

Query : 2018ApJ...852...50F

2018ApJ...852...50F - Astrophys. J., 852, 50-50 (2018/January-1)

Disentangling the Galactic halo with APOGEE. II. Chemical and star formation histories for the two distinct populations.

FERNANDEZ-ALVAR E., CARIGI L., SCHUSTER W.J., HAYES C.R., AVILA-VERGARA N., MAJEWSKI S.R., ALLENDE PRIETO C., BEERS T.C., SANCHEZ S.F., ZAMORA O., GARCIA-HERNANDEZ D.A., TANG B., FERNANDEZ-TRINCADO J.G., TISSERA P., GEISLER D. and VILLANOVA S.

Abstract (from CDS):

The formation processes that led to the current Galactic stellar halo are still under debate. Previous studies have provided evidence for different stellar populations in terms of elemental abundances and kinematics, pointing to different chemical and star formation histories (SFHs). In the present work, we explore, over a broader range in metallicity (-2.2 < [Fe/H] < +0.5), the two stellar populations detected in the first paper of this series from metal-poor stars in DR13 of the Apache Point Observatory Galactic Evolution Experiment (APOGEE). We aim to infer signatures of the initial mass function (IMF) and the SFH from the two α-to-iron versus iron abundance chemical trends for the most APOGEE-reliable α-elements (O, Mg, Si, and Ca). Using simple chemical-evolution models, we infer the upper mass limit (Mup) for the IMF and the star formation rate, and its duration for each population. Compared with the low-α population, we obtain a more intense and longer-lived SFH, and a top-heavier IMF for the high-α population.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

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

VizieR on-line data: <Available at CDS (J/ApJ/852/50): table1.dat>

Simbad objects: 178

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Number of rows : 178
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 2MASS J00052400+0059515 RG* 00 05 24.0153846048 +00 59 51.627004692           ~ 12 0
2 2MASS J00354120+5521256 RG* 00 35 41.2070522400 +55 21 25.632360720           ~ 11 0
3 2MASS J00381586+4026287 Pe* 00 38 15.8690810688 +40 26 28.666951260           ~ 8 0
4 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
5 2MASS J01154625+8418386 RG* 01 15 46.2851637936 +84 18 38.588270796           ~ 10 0
6 2MASS J01495315+5828219 RG* 01 49 53.1635819760 +58 28 21.948743496           ~ 9 0
7 2MASS J01583734-0144188 * 01 58 37.3440061272 -01 44 18.867870708           ~ 10 0
8 2MASS J06040874+1233507 RG* 06 04 08.7440731368 +12 33 50.822693316           ~ 14 0
9 2MASS J06332207+0602499 RG* 06 33 22.0730483760 +06 02 49.883263404           ~ 10 0
10 2MASS J06434210-2556086 RG* 06 43 42.1075675080 -25 56 08.688096132           ~ 13 0
11 2MASS J07083130-2114476 RG* 07 08 31.3026326616 -21 14 47.691602988           ~ 8 0
12 2MASS J07365596+2220125 Pe* 07 36 55.9579372536 +22 20 12.587906436           ~ 7 0
13 TYC 4543-827-1 RG* 08 30 13.2588459696 +79 11 46.377076740   12.80 11.89     ~ 13 0
14 2MASS J08392046+1610216 RG* 08 39 20.4682240896 +16 10 21.536795352           ~ 15 0
15 2MASS J08493832-1349559 RG* 08 49 38.3199243240 -13 49 55.913807748           ~ 11 0
16 Cl* NGC 2682 SAND 1857 RG* 08 53 06.5156083944 +12 14 37.452282108     14.997     ~ 16 0
17 2MASS J08571630+0459563 RG* 08 57 16.3021194960 +04 59 56.487437952           ~ 9 0
18 2MASS J09013802+0359047 RG* 09 01 38.0232176736 +03 59 04.656062508           ~ 10 0
19 2MASS J09284944-0758525 RG* 09 28 49.4457728616 -07 58 52.408459488           ~ 11 0
20 2MASS J10190657+0058377 * 10 19 06.5749353072 +00 58 37.748308980           ~ 7 0
21 2MASS J10303343+3538516 RG* 10 30 33.4308556824 +35 38 51.657088848           ~ 12 0
22 2MASS J10333208+3511151 RG* 10 33 32.0839897488 +35 11 15.230536512           ~ 7 0
23 BD-09 3110 RG* 10 37 42.2178114600 -10 42 32.788138788   11.474 10.340 9.69 9.452 ~ 27 0
24 2MASS J10375379+3958384 RG* 10 37 53.7930647376 +39 58 38.539754760           ~ 9 0
25 2MASS J10434303+2001180 RG* 10 43 43.0385405568 +20 01 18.075417744           ~ 11 0
26 2MASS J10443167-1106180 RG* 10 44 31.6589219352 -11 06 18.052728300           ~ 12 0
27 2MASS J10444005-1249172 RG* 10 44 40.0626304848 -12 49 17.125799988           ~ 11 0
28 2MASS J10464771+1647055 Pe* 10 46 47.7205675992 +16 47 05.541820476           ~ 7 0
29 2MASS J10474872-1126113 RG* 10 47 48.7246609416 -11 26 11.311964628           ~ 9 0
30 2MASS J10522368+1651020 Pe* 10 52 23.6787197160 +16 51 02.049531048           ~ 7 0
31 UCAC4 453-051283 RG* 10 56 41.3627644320 +00 31 46.627766652   14.014 12.885 12.593   ~ 19 0
32 2MASS J10585899+4842328 RG* 10 58 58.9962319848 +48 42 32.936553684           ~ 13 0
33 2MASS J11002833-1044050 RG* 11 00 28.3480844352 -10 44 05.020124496           ~ 8 0
34 2MASS J11005273-1052301 RG* 11 00 52.7426599608 -10 52 30.002908296           ~ 8 0
35 2MASS J11010359-0519023 RG* 11 01 03.6054963144 -05 19 02.459022168           ~ 13 0
36 2MASS J11080538-1027305 RG* 11 08 05.3799736704 -10 27 30.532622688           ~ 14 0
37 2MASS J11162912+0034147 RG* 11 16 29.1249635904 +00 34 14.720016252           ~ 9 0
38 2MASS J11195797+0737551 RG* 11 19 57.9740748672 +07 37 55.095817224           ~ 9 0
39 2MASS J11202609+0024314 RG* 11 20 26.0911267536 +00 24 31.347390852           ~ 10 0
40 UCAC4 471-045738 RG* 11 35 45.8002627680 +04 02 25.160218188   15.06 13.63 13.40   ~ 12 0
41 2MASS J11421270+2739489 Pe* 11 42 12.6992661552 +27 39 48.909200616           ~ 8 0
42 2MASS J11422622-1409451 RG* 11 42 26.2209240360 -14 09 45.253736388           ~ 11 0
43 2MASS J11430893+5531286 RG* 11 43 08.9401619568 +55 31 28.691085972           ~ 13 0
44 UCAC4 458-050946 RG* 11 43 23.1295892448 +01 29 40.688660616   14.22 13.12 12.79   ~ 13 0
45 2MASS J11465154+2748448 RG* 11 46 51.5452659192 +27 48 44.906619348           ~ 6 0
46 2MASS J11480236-1030083 RG* 11 48 02.3552401944 -10 30 08.392562604           ~ 13 0
47 UCAC4 453-052613 RG* 11 48 03.7259328864 +00 34 30.892693800   15.69 14.56 14.86   ~ 14 0
48 2MASS J11541830-1116404 Pe* 11 54 18.3147180816 -11 16 40.371671640           ~ 7 0
49 2MASS J11562991+1941347 RG* 11 56 29.8950770616 +19 41 34.680103620           ~ 10 0
50 2MASS J12001363-1648006 RG* 12 00 13.6227739104 -16 48 00.531894780           ~ 8 0
51 2MASS J12092825+0021205 RG* 12 09 28.2515396160 +00 21 20.519781048           ~ 11 0
52 2MASS J12115177-0033030 RG* 12 11 51.7729162608 -00 33 03.024670644           ~ 9 0
53 2MASS J12135565+0632201 RG* 12 13 55.6525279272 +06 32 20.268630276           ~ 11 0
54 2MASS J12145770+0408426 RG* 12 14 57.7083269592 +04 08 42.794979900           ~ 12 0
55 2MASS J12184246+1443582 RG* 12 18 42.4139357328 +14 43 58.281987648           ~ 10 0
56 2MASS J12212232-0217530 RG* 12 21 22.3162735200 -02 17 53.158447536           ~ 11 0
57 2MASS J12264309+0032141 RG* 12 26 43.1031467952 +00 32 14.027333640           ~ 10 0
58 2MASS J12405762-0239213 RG* 12 40 57.6253729704 -02 39 21.439039824           K3 10 0
59 2MASS J12430710-0712196 RG* 12 43 07.1135428512 -07 12 19.620299160           ~ 11 0
60 2MASS J12435160-0715029 RG* 12 43 51.6108307704 -07 15 02.989752984           ~ 8 0
61 2MASS J12451520+1259193 RG* 12 45 15.2081406960 +12 59 19.301829792           ~ 9 0
62 2MASS J12453446-0725071 RG* 12 45 34.4670086208 -07 25 07.151358036           ~ 8 0
63 UCAC4 417-055548 RG* 12 47 30.4412671224 -06 39 42.302237796   14.506 13.193 12.965   ~ 17 0
64 2MASS J12480602-0702221 Pe* 12 48 06.0212128320 -07 02 22.145021880           ~ 10 0
65 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1274 0
66 2MASS J12513121+5701487 RG* 12 51 31.2056326224 +57 01 48.786144528           ~ 12 0
67 2MASS J13083747-0225372 * 13 08 37.4617225848 -02 25 37.317720540           ~ 11 0
68 2MASS J13241777+1353445 RG* 13 24 17.7737898432 +13 53 44.447664480           ~ 9 0
69 2MASS J13242418+3753527 RG* 13 24 24.1935524376 +37 53 52.817901756           ~ 10 0
70 2MASS J13264140+7049077 * 13 26 41.4067949376 +70 49 07.601162952           ~ 11 0
71 TYC 3853-385-1 RG* 13 32 39.4333725840 +56 21 48.284930592   12.88 11.60     ~ 12 0
72 2MASS J13371556+5716385 Pe* 13 37 15.5438450712 +57 16 38.462423520           ~ 7 0
73 2MASS J13452642-1623320 Pe* 13 45 26.4228091080 -16 23 32.076783672           ~ 5 0
74 2MASS J13453541-1532564 RG* 13 45 35.4159134208 -15 32 56.466411324           ~ 9 0
75 2MASS J13471315+4351002 Pe* 13 47 13.1615149920 +43 51 00.015286464           ~ 7 0
76 2MASS J13580031+4430490 Pe* 13 58 00.3093273960 +44 30 49.030202160           ~ 5 0
77 2MASS J13590274+0118564 * 13 59 02.7577355016 +01 18 56.375326188           ~ 6 0
78 2MASS J14070704+5411394 RG* 14 07 07.0495326576 +54 11 39.277081068   14.5 13.5     ~ 15 0
79 2MASS J14075384+5426028 RG* 14 07 53.8574712168 +54 26 02.883300324           ~ 10 0
80 2MASS J14101638+5356296 Pe* 14 10 16.3913027304 +53 56 29.765806332           ~ 10 0
81 2MASS J14161913+0624000 Pe* 14 16 19.1387310888 +06 24 00.100982268           ~ 5 0
82 2MASS J14200850+8548458 RG* 14 20 08.5120042152 +85 48 45.830112120           ~ 9 0
83 2MASS J14203243-0512405 Pe* 14 20 32.4381665256 -05 12 40.675380984           ~ 6 0
84 2MASS J14205624-0533595 RG* 14 20 56.2496640864 -05 33 59.606278884           ~ 12 0
85 2MASS J14353222+0850507 RG* 14 35 32.2331209680 +08 50 50.897538348           ~ 9 0
86 2MASS J14365222+0920158 RG* 14 36 52.2223419936 +09 20 15.770930244           ~ 12 0
87 2MASS J14424814+4653219 RG* 14 42 48.1404538440 +46 53 21.927050052           ~ 12 0
88 2MASS J14544530+4620023 RG* 14 54 45.2898812928 +46 20 02.385567888           ~ 9 0
89 2MASS J14563398+3119407 Pe* 14 56 33.9875239176 +31 19 40.753792452           ~ 6 0
90 2MASS J14584788+1804480 RG* 14 58 47.8773202872 +18 04 47.786885364           ~ 13 0
91 2MASS J15002304+2241211 RG* 15 00 23.0406637464 +22 41 21.298007616           ~ 13 0
92 2MASS J15034295+2224510 Pe* 15 03 42.9469517232 +22 24 51.048855072           ~ 9 0
93 2MASS J15071481+2807065 Pe* 15 07 14.8088157096 +28 07 06.544045452           ~ 7 0
94 2MASS J15113133+2638295 RG* 15 11 31.3394737440 +26 38 29.597436528           ~ 12 0
95 2MASS J15141387+0135392 RG* 15 14 13.8766522704 +01 35 39.288875352           ~ 12 0
96 2MASS J15153684+3501283 RG* 15 15 36.8380994808 +35 01 28.385123772           ~ 12 0
97 2MASS J15170491+0145472 Pe* 15 17 04.9198983024 +01 45 47.341275012           ~ 7 0
98 TYC 5002-316-1 RG* 15 18 03.6927364680 -00 38 52.070884620   11.4 10.2     ~ 13 0
99 2MASS J15214338+3504026 Pe* 15 21 43.3768136496 +35 04 02.839142244           ~ 6 0
100 2MASS J15223707+3444559 RG* 15 22 37.0765516704 +34 44 55.960941012           ~ 9 0
101 2MASS J15235811+3711434 RG* 15 23 58.1187765576 +37 11 43.532403072           ~ 9 0
102 2MASS J15240979+3717019 RG* 15 24 09.8004815712 +37 17 01.979947428           ~ 8 0
103 2MASS J15275294+3720024 RG* 15 27 52.9384408584 +37 20 02.250535056           ~ 14 0
104 TYC 3055-1068-1 RG* 15 27 58.9327389240 +42 26 41.148231108   12.89 11.74     ~ 13 0
105 2MASS J15304608+3615188 Pe* 15 30 46.0722452592 +36 15 18.834437916           ~ 6 0
106 2MASS J15305657+4437507 Pe* 15 30 56.5745948472 +44 37 50.793663288           ~ 5 0
107 2MASS J16093984+2442064 RG* 16 09 39.8399526000 +24 42 06.469173504           ~ 12 0
108 2MASS J16125478+2432038 RG* 16 12 54.7752290472 +24 32 03.726683196           ~ 13 0
109 2MASS J16152003+2442321 RG* 16 15 20.0354511624 +24 42 32.242871988           ~ 10 0
110 2MASS J16262272-1154588 RG* 16 26 22.7186453664 -11 54 58.892185332           ~ 10 0
111 UCAC4 392-066283 RG* 16 32 06.8167532160 -11 46 39.962164188     12.699 12.349   ~ 13 0
112 2MASS J16323360-1200297 RG* 16 32 33.5998911216 -12 00 29.807394156           ~ 8 0
113 2MASS J16324472-1202552 RG* 16 32 44.7271171392 -12 02 55.151564712           ~ 12 0
114 2MASS J16400238+4741522 RG* 16 40 02.3787730848 +47 41 52.301524956           ~ 10 0
115 2MASS J16411512+3601018 RG* 16 41 15.1329632928 +36 01 01.752936564           ~ 9 0
116 2MASS J16454727+3701379 RG* 16 45 47.2707611592 +37 01 37.825434588           ~ 14 0
117 2MASS J16564817+0945170 RG* 16 56 48.1696293240 +09 45 17.101784160           ~ 10 0
118 2MASS J16571950+1136249 Pe* 16 57 19.5082397544 +11 36 24.918489468           ~ 8 0
119 2MASS J16583963+1205477 * 16 58 39.6317662920 +12 05 47.683223736           ~ 12 0
120 2MASS J17040100+5925261 RG* 17 04 01.0044052488 +59 25 26.262212124           ~ 10 0
121 2MASS J17114410+5448302 RG* 17 11 44.1164267952 +54 48 30.323097144           ~ 13 0
122 2MASS J17122190+5953433 * 17 12 21.8954599824 +59 53 43.313614044           ~ 9 0
123 2MASS J17181294+4902080 RG* 17 18 12.9255360864 +49 02 08.048614128           ~ 11 0
124 2MASS J17185175+5423359 RG* 17 18 51.7491471048 +54 23 35.981635776           ~ 9 0
125 2MASS J17203378+4327517 RG* 17 20 33.7932011304 +43 27 51.771879576           ~ 12 0
126 2MASS J17204202+2339512 RG* 17 20 42.0286670520 +23 39 51.253465536           ~ 11 0
127 2MASS J17204225+4352472 * 17 20 42.2619698400 +43 52 47.246837736           ~ 8 0
128 2MASS J17294680-2644220 RG* 17 29 46.8037965960 -26 44 22.134296148           ~ 11 0
129 2MASS J17313017+3604072 * 17 31 30.1707591384 +36 04 07.248004104           ~ 11 0
130 2MASS J17321828+3402036 RG* 17 32 18.2849695272 +34 02 03.658198164           ~ 12 0
131 2MASS J17343551+3519378 RG* 17 34 35.5123073760 +35 19 37.869456684           ~ 9 0
132 2MASS J17380274+3609338 RG* 17 38 02.7385715592 +36 09 33.663374640           ~ 12 0
133 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
134 2MASS J17485751+6140204 * 17 48 57.5139388584 +61 40 20.527190256           ~ 7 0
135 2MASS J17494969+6111548 RG* 17 49 49.6910319072 +61 11 54.770280252           ~ 13 0
136 2MASS J17513478+4854513 RG* 17 51 34.7735597664 +48 54 51.187955148           ~ 15 0
137 2MASS J17521868+4703262 RG* 17 52 18.6795633336 +47 03 26.268396516           ~ 10 0
138 2MASS J17533662+4842161 Pe* 17 53 36.6344126592 +48 42 16.212965256           ~ 5 0
139 2MASS J17535944+4708092 * 17 53 59.4451534896 +47 08 09.199471956           ~ 13 0
140 2MASS J17590085+0332263 Pe* 17 59 00.8559687168 +03 32 26.395823436         13.256 ~ 10 0
141 2MASS J18132084+0112054 RG* 18 13 20.8456091784 +01 12 05.473380888           ~ 10 0
142 2MASS J18201433-0003373 RG* 18 20 14.3325609216 -00 03 37.420169256           ~ 12 0
143 2MASS J18213930+0130297 RG* 18 21 39.3104418216 +01 30 29.661590412           ~ 14 0
144 2MASS J18254276-0603306 RG* 18 25 42.7606977024 -06 03 30.415951980           ~ 12 0
145 2MASS J18354486-0048092 RG* 18 35 44.8658794992 -00 48 09.260440776           ~ 7 0
146 2MASS J18360248+0008224 RG* 18 36 02.4774016872 +00 08 22.543374084           ~ 11 0
147 2MASS J18391085-0439210 RG* 18 39 10.85136 -04 39 21.0276           ~ 7 0
148 TYC 3540-1495-1 RG* 18 45 14.5391135640 +46 42 00.641475612   11.67 10.66     ~ 12 0
149 2MASS J18501947+2948368 RG* 18 50 19.4820047376 +29 48 36.879512832           ~ 9 0
150 2MASS J18525768+2820342 RG* 18 52 57.6891046200 +28 20 34.251602928           ~ 10 0
151 2MASS J18564540-0357560 RG* 18 56 45.4025022552 -03 57 56.153290896           ~ 10 0
152 2MASS J18582881-0627186 RG* 18 58 28.8152645688 -06 27 18.671479920           ~ 11 0
153 2MASS J19015625+4558178 RG* 19 01 56.2545766464 +45 58 17.760882072           G8IV 22 0
154 2MASS J19020047-0406093 RG* 19 02 00.4721380632 -04 06 09.320895180           ~ 12 0
155 TYC 3541-1271-1 RG* 19 03 30.7021583688 +46 16 12.637333308   12.33 11.75     ~ 12 0
156 2MASS J19042227+4753575 Pe* 19 04 22.2755437104 +47 53 57.451287048           ~ 9 0
157 UCAC4 667-070829 RG* 19 05 23.1588132264 +43 18 32.070171888   14.540 13.402 13.152   ~ 21 0
158 UCAC4 706-062284 RG* 19 11 58.0982162400 +51 06 28.103600952   15.163 13.672 13.449   G8III 13 0
159 2MASS J19154424-0604209 Pe* 19 15 44.2447707192 -06 04 20.892396540           ~ 9 0
160 2MASS J19242924+4337298 V* 19 24 29.2366479696 +43 37 29.881273908           ~ 11 0
161 UCAC4 697-066455 RG* 19 28 19.0602424992 +49 15 08.612412660   13.482 12.130 11.795   G8III 15 0
162 2MASS J19291651-0919046 Pe* 19 29 16.5199571568 -09 19 04.673307108           ~ 7 0
163 TYC 3543-1884-1 HB* 19 29 38.8597308600 +45 54 30.023015004   13.27 12.22     ~ 22 0
164 2MASS J19395101+1415157 Pe* 19 39 51.0130896720 +14 15 15.771321000           ~ 6 0
165 2MASS J19470449+2417101 RG* 19 47 04.4958888912 +24 17 10.112257212           ~ 8 0
166 TYC 3562-342-1 RG* 19 54 19.5730448184 +48 27 05.827390056   12.79 11.15     K1III 34 0
167 2MASS J20040817+4453233 RG* 20 04 08.1764214504 +44 53 23.364352536           ~ 8 0
168 2MASS J20094007+2011075 * 20 09 40.0789406376 +20 11 07.546495092           ~ 8 0
169 2MASS J20302634+1832416 Pe* 20 30 26.3471129256 +18 32 41.735895936           ~ 8 0
170 2MASS J20303342+4531170 RG* 20 30 33.4231185720 +45 31 17.093801640           ~ 11 0
171 2MASS J21152798+4701422 RG* 21 15 27.9933170016 +47 01 42.144635172           ~ 12 0
172 2MASS J21313287+1225112 RG* 21 31 32.8793605992 +12 25 11.216831016           ~ 11 0
173 2MASS J21340159+0019261 Pe* 21 34 01.5891334416 +00 19 26.148508356           ~ 7 0
174 2MASS J21365581+0015359 RG* 21 36 55.8178762392 +00 15 35.921326500           ~ 9 0
175 2MASS J21380584+4252312 RG* 21 38 05.8552800456 +42 52 31.237681224           ~ 7 0
176 2MASS J22384306+0611556 * 22 38 43.0733162400 +06 11 55.558151448           ~ 7 0
177 2MASS J23161405+1257322 Pe* 23 16 14.0628953232 +12 57 32.189343192           ~ 4 0
178 2MASS J23581225+1604435 Pe* 23 58 12.2505592368 +16 04 43.574413728           ~ 6 0

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