2021ApJ...907...47L

Query : 2021ApJ...907...47L

2021ApJ...907...47L - Astrophys. J., 907, 47-47 (2021/January-3)

Difference in chemical composition between the bright and faint red clump stars in the Milky Way bulge.

LIM D., LEE Y.-W., KOCH A., HONG S., JOHNSON C.I., KIM J., CHUNG C., MATEO M. and BAILEY J.I.

Abstract (from CDS):

The double red clump (RC) observed in color-magnitude diagrams of the Milky Way bulge is at the heart of the current debate on the structure and formation origin of the bulge. This feature can be explained by the difference between the two RCs either in distance ("X-shaped scenario") or in chemical composition ("multiple-population scenario"). Here we report our high-resolution spectroscopy for the RC and red giant branch stars in a high-latitude field (b ∼ -8.5°) of the bulge. We find a difference in [Fe/H] between the stars in the bright and faint RC regimes, in the sense that the bright stars are enhanced in [Fe/H] with respect to the faint stars by 0.149 ± 0.036 dex. The stars on the bright RC are also enhanced in [Na/Fe] but appear to be depleted in [Al/Fe] and [O/Fe], although more observations are required to confirm the significance of these differences. Interestingly, these chemical patterns are similar to those observed among multiple stellar populations in the metal-rich bulge globular cluster Terzan 5. In addition, we find a number of Na-rich stars, which would corroborate the presence of multiple populations in the bulge. Our results support an origin of the double RC from dissolved globular clusters that harbor multiple stellar populations. Thus, our study suggests that a substantial fraction of the outer bulge stars would have originated from the assembly of such stellar systems in the early phase of the Milky Way formation.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Galaxy formation - Globular star clusters - Galaxy bulges - Red giant clump - Stellar abundances - Spectroscopy

VizieR on-line data: <Available at CDS (J/ApJ/907/47): table1.dat>

Simbad objects: 364

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Number of rows : 364
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 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
3 [KBT2017] Gaia 1 OpC 06 45 53.6 -16 43 34           ~ 20 0
4 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
5 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
6 Liller 1 Cl* 17 33 24.50 -33 23 20.0           ~ 311 0
7 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 948 1
8 2MASS J18160585-3353342 HB* 18 16 05.85360 -33 53 34.2276           ~ 1 0
9 2MASS J18160637-3352013 HB* 18 16 06.37680 -33 52 01.3548           ~ 1 0
10 2MASS J18160648-3348029 HB* 18 16 06.4846813041 -33 48 02.964065482           ~ 1 0
11 2MASS J18160720-3352114 HB* 18 16 07.20672 -33 52 11.4888           ~ 1 0
12 2MASS J18160779-3353126 HB* 18 16 07.79088 -33 53 12.6672           ~ 1 0
13 2MASS J18160786-3353211 HB* 18 16 07.8704205434 -33 53 21.116231360           ~ 1 0
14 2MASS J18160794-3348104 HB* 18 16 07.94856 -33 48 10.4904           ~ 1 0
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67 2MASS J18163792-3400571 HB* 18 16 37.92360 -34 00 57.1824           ~ 1 0
68 2MASS J18163804-3344490 HB* 18 16 38.04456 -33 44 49.0956           ~ 1 0
69 2MASS J18163818-3346105 HB* 18 16 38.1808994755 -33 46 10.559407224           ~ 1 0
70 2MASS J18163825-3349199 HB* 18 16 38.25192 -33 49 19.9380           ~ 1 0
71 2MASS J18163856-3351522 HB* 18 16 38.56584 -33 51 52.2360           ~ 1 0
72 2MASS J18163857-3404541 HB* 18 16 38.57640 -34 04 54.1308           ~ 1 0
73 2MASS J18163997-3359519 HB* 18 16 39.97344 -33 59 51.9936           ~ 1 0
74 2MASS J18164033-3403195 HB* 18 16 40.33608 -34 03 19.5804           ~ 1 0
75 2MASS J18164069-3408582 HB* 18 16 40.69128 -34 08 58.2216           ~ 1 0
76 2MASS J18164076-3410035 HB* 18 16 40.7648782929 -34 10 03.602393524           ~ 1 0
77 2MASS J18164081-3352552 HB* 18 16 40.81440 -33 52 55.2828           ~ 1 0
78 2MASS J18164092-3406022 HB* 18 16 40.9168265812 -34 06 02.302308896           ~ 1 0
79 2MASS J18164148-3350412 HB* 18 16 41.48928 -33 50 41.2764           ~ 1 0
80 2MASS J18164156-3346113 HB* 18 16 41.56224 -33 46 11.3988           ~ 1 0
81 2MASS J18164165-3351593 HB* 18 16 41.65440 -33 51 59.3352           ~ 1 0
82 2MASS J18164172-3359589 HB* 18 16 41.72616 -33 59 58.9416           ~ 1 0
83 2MASS J18164224-3350143 HB* 18 16 42.2438902340 -33 50 14.281490468           ~ 1 0
84 2MASS J18164233-3350581 HB* 18 16 42.33912 -33 50 58.1964           ~ 1 0
85 2MASS J18164250-3354282 HB* 18 16 42.50928 -33 54 28.2960           ~ 1 0
86 2MASS J18164273-3352371 HB* 18 16 42.73200 -33 52 37.1532           ~ 1 0
87 2MASS J18164301-3410127 HB* 18 16 43.01136 -34 10 12.7776           ~ 1 0
88 2MASS J18164310-3353339 HB* 18 16 43.10496 -33 53 33.9144           ~ 1 0
89 2MASS J18164317-3406213 HB* 18 16 43.17312 -34 06 21.3768           ~ 1 0
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92 2MASS J18164393-3347007 HB* 18 16 43.93656 -33 47 00.7260           ~ 1 0
93 2MASS J18164473-3404561 HB* 18 16 44.73312 -34 04 56.1108           ~ 1 0
94 2MASS J18164507-3402251 HB* 18 16 45.07728 -34 02 25.1700           ~ 1 0
95 2MASS J18164537-3402430 HB* 18 16 45.37656 -34 02 43.0080           ~ 1 0
96 2MASS J18164686-3353148 HB* 18 16 46.86912 -33 53 14.8776           ~ 1 0
97 2MASS J18164726-3408204 HB* 18 16 47.2662938850 -34 08 20.491858043           ~ 1 0
98 2MASS J18164780-3356435 HB* 18 16 47.80488 -33 56 43.5516           ~ 1 0
99 2MASS J18164797-3354297 HB* 18 16 47.9701903267 -33 54 29.779228860           ~ 1 0
100 2MASS J18164845-3404429 HB* 18 16 48.4477553276 -34 04 42.974905024           ~ 1 0
101 2MASS J18164921-3353090 HB* 18 16 49.21464 -33 53 09.0024           ~ 1 0
102 2MASS J18164923-3401152 HB* 18 16 49.23888 -34 01 15.2292           ~ 1 0
103 2MASS J18164938-3349406 HB* 18 16 49.38600 -33 49 40.6884           ~ 1 0
104 2MASS J18164956-3401424 HB* 18 16 49.56912 -34 01 42.4056           ~ 1 0
105 2MASS J18164971-3402185 HB* 18 16 49.7123365588 -34 02 18.541501995           ~ 1 0
106 2MASS J18165044-3346456 HB* 18 16 50.44104 -33 46 45.6348           ~ 1 0
107 2MASS J18165066-3409227 HB* 18 16 50.66184 -34 09 22.7880           ~ 1 0
108 2MASS J18165134-3352527 HB* 18 16 51.34560 -33 52 52.7412           ~ 1 0
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362 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1459 0
363 NAME Galactic Bar reg ~ ~           ~ 1458 0
364 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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