2019ApJ...882..177M

Query : 2019ApJ...882..177M

2019ApJ...882..177M - Astrophys. J., 882, 177-177 (2019/September-2)

Chemical abundance analysis of Tucana III, the second r-process enhanced ultra-faint dwarf galaxy.

MARSHALL J.L., HANSEN T., SIMON J.D., LI T.S., BERNSTEIN R.A., KUEHN K., PACE A.B., DEPOY D.L., PALMESE A., PIERES A., STRIGARI L., DRLICA-WAGNER A., BECHTOL K., LIDMAN C., NAGASAWA D.Q., BERTIN E., BROOKS D., BUCKLEY-GEER E., BURKE D.L., CARNERO ROSELL A., CARRASCO KIND M., CARRETERO J., CUNHA C.E., D'ANDREA C.B., DA COSTA L.N., DE VICENTE J., DESAI S., DOEL P., EIFLER T.F., FLAUGHER B., FOSALBA P., FRIEMAN J., GARCIA-BELLIDO J., GAZTANAGA E., GERDES D.W., GRUENDL R.A., GSCHWEND J., GUTIERREZ G., HARTLEY W.G., HOLLOWOOD D.L., HONSCHEID K., HOYLE B., JAMES D.J., KUROPATKIN N., MAIA M.A.G., MENANTEAU F., MILLER C.J., MIQUEL R., PLAZAS A.A., SANCHEZ E., SANTIAGO B., SCARPINE V., SCHUBNELL M., SERRANO S., SEVILLA-NOARBE I., SMITH M., SOARES-SANTOS M., SUCHYTA E., SWANSON M.E.C., TARLE G., WESTER W. (The DES Collaboration)

Abstract (from CDS):

We present a chemical abundance analysis of four additional confirmed member stars of Tucana III, a Milky Way satellite galaxy candidate in the process of being tidally disrupted as it is accreted by the Galaxy. Two of these stars are centrally located in the core of the galaxy while the other two stars are located in the eastern and western tidal tails. The four stars have chemical abundance patterns consistent with the one previously studied star in Tucana III: they are moderately enhanced in r-process elements, i.e., they have <[Eu/Fe]>~+0.4 dex. The non-neutron-capture elements generally follow trends seen in other dwarf galaxies, including a metallicity range of 0.44 dex and the expected trend in α-elements, i.e., the lower metallicity stars have higher Ca and Ti abundances. Overall, the chemical abundance patterns of these stars suggest that Tucana III was an ultra-faint dwarf galaxy, and not a globular cluster, before being tidally disturbed. As is the case for the one other galaxy dominated by r-process enhanced stars, Reticulum II, Tucana III's stellar chemical abundances are consistent with pollution from ejecta produced by a binary neutron star merger, although a different r-process element or dilution gas mass is required to explain the abundances in these two galaxies if a neutron star merger is the sole source of r-process enhancement.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): Chemical abundances - Chemically peculiar stars - Dwarf galaxies

VizieR on-line data: <Available at CDS (J/ApJ/882/177): table1.dat table2.dat table3.dat>

Simbad objects: 25

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Number of rows : 25
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 DES J000548.69-593406.1 * 00 05 48.7161674688 -59 34 06.183178968           ~ 3 0
2 NAME Tri II G 02 13 17.40 +36 10 42.4           ~ 164 0
3 NAME Segue 2 G 02 19 16.0 +20 10 31     15.2     ~ 299 0
4 NAME Hor I G 02 55 31.7 -54 07 08           ~ 169 0
5 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 375 0
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
7 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
8 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
9 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
10 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
11 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 482 1
12 NAME Bootes II G 13 58 00.0 +12 51 00     15.4     ~ 269 0
13 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
14 * 5 Ser PM* 15 19 18.7974409923 +01 45 55.466382064   5.60   4.8   F8IV 355 0
15 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
16 NGC 6388 GlC 17 36 17.461 -44 44 08.34           ~ 988 1
17 NGC 6441 GlC 17 50 13.06 -37 03 05.2           ~ 940 0
18 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
19 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
20 NAME Tuc II G 22 51 55.1 -58 34 08           ~ 192 0
21 DES J234350.83-593925.6 SB* 23 43 50.8500370512 -59 39 25.741782252           ~ 3 0
22 DES J235532.68-593115.0 * 23 55 32.6946605952 -59 31 15.049317072           ~ 9 0
23 DES J235549.92-593259.7 * 23 55 49.9347828744 -59 32 59.696894220           ~ 6 0
24 NAME Tuc III G 23 56.6 -59 36           ~ 229 0
25 DES J235738.50-593611.7 * 23 57 38.5118229432 -59 36 11.763919548           ~ 6 0

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