2020A&A...643L...4F

Query : 2020A&A...643L...4F

2020A&A...643L...4F - Astronomy and Astrophysics, volume 643, L4-4 (2020/11-1)

Aluminium-enriched metal-poor stars buried in the inner Galaxy.

FERNANDEZ-TRINCADO J.G., BEERS T.C., MINNITI D., TANG B., VILLANOVA S., GEISLER D., PEREZ-VILLEGAS A. and VIEIRA K.

Abstract (from CDS):

Stars with higher levels of aluminium and nitrogen enrichment are often key pieces in the chemical makeup of multiple populations in almost all globular clusters (GCs). There is also compelling observational evidence that some Galactic components could be partially built from dissipated GCs. The identification of such stars among metal-poor field stars may therefore provide insight into the composite nature of the Milky Way (MW) bulge and inner stellar halo, and could also reveal other chemical peculiarities. Here, based on APOGEE spectra, we report the discovery of 29 mildly metal-poor ([Fe/H]≤-0.7) stars with stellar atmospheres strongly enriched in aluminium (Al-rich stars: [Al/Fe]≥+0.5), well above the typical Galactic levels, located within the solar radius toward the bulge region, which lies in highly eccentric orbits (e≥0.6). We find many similarities for almost all of the chemical species measured in this work with the chemical patterns of GCs, and therefore we propose that they have likely been dynamically ejected into the bulge and inner halo from GCs formed in situ and/or GCs formed in different progenitors of known merger events experienced by the MW, such as the Gaia-Sausage-Enceladus and/or Sequoia.

Abstract Copyright: © ESO 2020

Journal keyword(s): stars: abundances - stars: chemically peculiar - Galaxy: bulge - globular clusters: general - Galaxy: stellar content - Galaxy: kinematics and dynamics

Simbad objects: 62

Full paper

View the references in ADS

Number of rows : 62

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag B	Mag V	Sp type	#ref 1850 - 2023	#notes
1	NGC 288	GlC	00 52 45.24	-26 34 57.4	10	8.13	~	1013	0
2	NGC 362	GlC	01 03 14.26	-70 50 55.6		6.58	~	1045	0
3	2MASS J02593571-1731458	RG*	02 59 35.7158926177	-17 31 45.896288533			~	6	0
4	NGC 1851	GlC	05 14 06.76	-40 02 47.6			~	1381	0
5	M 79	GlC	05 24 10.59	-24 31 27.3		8.16	~	788	0
6	TYC 3771-213-1	Pe*	06 57 26.9745175944	+55 43 11.614243332	12.42	11.71	~	2	0
7	NGC 2808	GlC	09 12 03.10	-64 51 48.6			~	1378	0
8	NGC 3201	GlC	10 17 36.82	-46 24 44.9			~	835	0
9	M 53	GlC	13 12 55.25	+18 10 05.4		7.79	~	805	0
10	NGC 5139	GlC	13 26 47.28	-47 28 46.1			~	3329	0
11	M 3	GlC	13 42 11.62	+28 22 38.2		6.39	~	2424	0
12	NGC 5466	GlC	14 05 27.29	+28 32 04.0		9.70	~	809	0
13	2MASS J14063545+2734116	Pe*	14 06 35.4399295477	+27 34 11.706574270			~	2	0
14	2MASS J15053060+4211466	RG*	15 05 30.6008518920	+42 11 46.648452660			~	6	0
15	NAME Serpens Dwarf	GlC	15 16 05.30	-00 06 41.0	15.1		~	711	1
16	M 5	GlC	15 18 33.22	+02 04 51.7		5.95	~	1926	0
17	2MASS J15532396-3509322	*	15 53 23.9613946619	-35 09 32.251702039			~	1	0
18	2MASS J15535622+2237419	*	15 53 56.2203152132	+22 37 41.882030646			~	1	0
19	2MASS J16035902+0703353	*	16 03 59.0284772285	+07 03 35.252171040			~	1	0
20	2MASS J16055435+3003432	Pe*	16 05 54.3511950667	+30 03 43.204397147			~	2	0
21	2MASS J16102218-2158014	Pe*	16 10 22.1858568219	-21 58 01.389150182			~	3	0
22	2MASS J16112935-2000538	Pe*	16 11 29.3604865483	-20 00 53.857970121			~	2	0
23	M 4	GlC	16 23 35.22	-26 31 32.7			~	1802	0
24	2MASS J16282719-0050428	RG*	16 28 27.1960188504	-00 50 42.854544312			~	5	0
25	M 107	GlC	16 32 31.86	-13 03 13.6			~	765	0
26	M 13	GlC	16 41 41.634	+36 27 40.75		5.8	~	2146	0
27	2MASS J16443329+3624504	Pe*	16 44 33.2890361712	+36 24 50.336452440			~	4	0
28	NGC 6229	GlC	16 46 58.641	+47 31 36.38	9.38	9.86	~	353	0
29	M 12	GlC	16 47 14.18	-01 56 54.7		6.07	~	646	0
30	M 10	GlC	16 57 09.05	-04 06 01.1		4.98	~	761	0
31	2MASS J17254242-1331201	Pe*	17 25 42.4157623437	-13 31 20.084215734			~	2	0
32	2MASS J17254298-2106351	Pe*	17 25 42.9818667435	-21 06 35.142662512			~	2	0
33	AP J17313399-2640506	LP?	17 31 33.9920290916	-26 40 50.583896534			~	2	0
34	2MASS J17343682-2654206	Pe*	17 34 36.8276622176	-26 54 20.730040617			~	2	0
35	NGC 6397	GlC	17 40 42.09	-53 40 27.6		5.17	~	1923	0
36	2MASS J17425767-2803437	*	17 42 57.67176	-28 03 43.7076			~	2	0
37	2MASS J17431262-2843363	*	17 43 12.62904	-28 43 36.3468			~	2	0
38	ESO 520-21	GlC	17 43 42.20	-26 13 21.0			~	169	0
39	NAME Galactic Center	reg	17 45 39.60213	-29 00 22.0000			~	13675	0
40	2MASS J17461523-3407127	Pe*	17 46 15.23088	-34 07 12.7092			~	2	0
41	2MASS J17475763-2913591	*	17 47 57.63552	-29 13 59.1924			~	1	0
42	2MASS J17480799-2712083	*	17 48 07.99008	-27 12 08.3124			~	2	0
43	2MASS J17484544-2915516	*	17 48 45.44832	-29 15 51.6204			~	2	0
44	ESO 521-16	GlC	18 02 57.40	-26 04 00.0			~	93	0
45	NGC 6522	GlC	18 03 34.08	-30 02 02.3			~	507	0
46	2MASS J18035017-2552334	*	18 03 50.17776	-25 52 33.4452			~	2	0
47	2MASS J18041915-3703227	Pe*	18 04 19.1597950945	-37 03 22.743426207			~	2	0
48	NGC 6544	GlC	18 07 20.58	-24 59 50.4	11.36	9.90	~	282	0
49	M 22	GlC	18 36 23.94	-23 54 17.1			~	1335	0
50	2MASS J18490114-3042332	Pe*	18 49 01.1454599980	-30 42 33.255150815			~	2	0
51	2MASS J18524618-2520372	*	18 52 46.1827273982	-25 20 37.220972406			~	1	0
52	M 54	GlC	18 55 03.33	-30 28 47.5			~	1033	0
53	NGC 6723	GlC	18 59 33.15	-36 37 56.1			~	480	0
54	2MASS J19010991-2121082	Pe*	19 01 09.91392	-21 21 08.2908			~	2	0
55	NGC 6752	GlC	19 10 52.11	-59 59 04.4			~	1944	0
56	M 55	GlC	19 39 59.71	-30 57 53.1		6.49	~	830	0
57	M 2	GlC	21 33 27.02	-00 49 23.7		6.25	~	1000	1
58	2MASS J21372238+1244305	Pe*	21 37 22.4000599454	+12 44 30.331757284			~	3	0
59	2MASS J22015198-1141479	Pe*	22 01 51.9817034460	-11 41 47.844846082			~	2	0
60	NAME Galactic Bulge	reg	~	~			~	4094	0
61	NAME Gaia Enceladus-Sausage	St*	~	~			~	398	0
62	NAME Galactic Bar	reg	~	~			~	1142	0

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