2026ApJ...998..114W

Query : 2026ApJ...998..114W

2026ApJ...998..114W - Astrophys. J., 998, 114 (2026/February-2)

Detailed Chemical Abundance Analysis of the Brightest Stars in the Turranburra and Willka Yaku Stellar Streams.

WEBBER K.B., HANSEN T.T., MARSHALL J.L., JI A.P., LI T.S., DA COSTA G.S., CULLINANE L.R., ERKAL D., KOPOSOV S.E., KUEHN K., LEWIS G.F., MACKEY D., MARTELL S.L., PACE A.B., SHIPP N., SIMPSON J.D., WAN Z., ZUCKER D.B., ALVARADO V.A., BLAND-HAWTHORN J., LIMBERG G., MEDINA G.E. and USMAN S.A.

Abstract (from CDS):

We present a detailed chemical abundance analysis of the three brightest known stars from each of the Turranburra and Willka Yaku stellar streams using high-resolution Magellan/Magellan Inamori Kyocera Echelle spectra. Abundances for 27 elements, ranging from carbon to dysprosium, were derived. Our results support the original classification that Turranburra, with a low average metallicity of [Fe/H] = -2.45 ± 0.07, likely originates from a dwarf galaxy progenitor. Willka Yaku has a low average metallicity of [Fe/H] = -2.35 ± 0.03 with a small scatter in the abundances, consistent with a globular cluster progenitor as suggested by previous studies. Both streams exhibit mild enhancements in neutron-capture elements, with averages of [Eu II/Fe] = 0.47 ± 0.09 for Turranburra and 0.44 ± 0.05 for Willka Yaku, consistent with enrichment from an r-process event. A similar enrichment is observed in other stellar streams, and we further discuss this signature as it relates to the potential enrichment histories of these two streams.

Abstract Copyright: © 2026. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Stellar abundances - Chemical abundances - Stellar streams

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR. // All or part of tables of objects will be ingested in SIMBAD with priority 1.

Simbad objects: 32

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Number of rows : 32
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 Elqui Stream St* 00 43 -36.9           ~ 22 0
2 NAME Cetus-Palca Stream St* 01 31 +01.0           ~ 97 1
3 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 575 2
4 NAME Aliqa Uma Stream St* 02 07 -31.5           ~ 33 0
5 NAME Willka Yaku Stream St* 02 24 -64.6           ~ 15 0
6 Gaia DR3 4701367723002671744 * 02 25 47.8562169713 -62 09 45.115646951           ~ 1 0
7 Gaia DR3 4725846184731540608 * 02 31 33.9038748173 -60 07 16.422524320           ~ 1 0
8 Gaia DR3 4725852300765007104 * 02 33 35.6228284078 -59 55 52.031842816           ~ 1 0
9 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
10 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 375 0
11 NAME Turranburra Stream St* 03 57 -18.0           ~ 13 0
12 CRTS J041037.4-202900 RR* 04 10 37.4386964712 -20 28 59.239488684     16.75     ~ 11 0
13 Gaia DR3 4898141752749430400 * 04 30 43.6697386165 -22 40 36.518773351           ~ 1 0
14 Gaia DR3 4898307401048261248 * 04 35 11.5217235009 -22 45 32.769068977           ~ 1 0
15 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
16 NAME LMS-1 Stream St* 13 14.5 +17 56           ~ 63 0
17 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
18 NGC 5824 GlC 15 03 58.612 -33 04 06.70   10.28 9.56     ~ 441 0
19 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
20 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
21 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
22 NAME Chenab Stream St* 21 17 -59.9           ~ 45 0
23 NAME Jhelum Stream St* 21 25 -45.1           ~ 40 0
24 NAME Indus Stream St* 21 35 -50.7           ~ 34 0
25 NAME Gru II G 22 04.1 -46 26           ~ 110 0
26 NAME Tuc V G 23 37.4 -63 16           ~ 84 0
27 HD 222925 Pe* 23 45 17.6074777008 -61 54 42.835286016   9.56 9.03     ApSrEu 83 0
28 NAME Tuc III G 23 56.6 -59 36           ~ 229 0
29 NAME Helmi Stream St* ~ ~           ~ 144 0
30 NAME Gjoll Stream St* ~ ~           ~ 21 0
31 NAME Typhon Stream St* ~ ~           ~ 7 0
32 NAME Leiptr Stream St* ~ ~           ~ 11 0

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