2017ApJ...838...44H

Query : 2017ApJ...838...44H

2017ApJ...838...44H - Astrophys. J., 838, 44-44 (2017/March-3)

An r-process enhanced star in the dwarf galaxy Tucana III.

HANSEN T.T., SIMON J.D., MARSHALL J.L., LI T.S., CAROLLO D., DEPOY D.L., NAGASAWA D.Q., BERNSTEIN R.A., DRLICA-WAGNER A., ABDALLA F.B., ALLAM S., ANNIS J., BECHTOL K., BENOIT-LEVY A., BROOKS D., BUCKLEY-GEER E., CARNERO ROSELL A., CARRASCO KIND M., CARRETERO J., CUNHA C.E., DA COSTA L.N., DESAI S., EIFLER T.F., FAUSTI NETO A., FLAUGHER B., FRIEMAN J., GARCIA-BELLIDO J., GAZTANAGA E., GERDES D.W., GRUEN D., GRUENDL R.A., GSCHWEND J., GUTIERREZ G., JAMES D.J., KRAUSE E., KUEHN K., KUROPATKIN N., LAHAV O., MIQUEL R., PLAZAS A.A., ROMER A.K., SANCHEZ E., SANTIAGO B., SCARPINE V., SMITH R.C., SOARES-SANTOS M., SOBREIRA F., SUCHYTA E., SWANSON M.E.C., TARLE G., WALKER A.R. (The DES Collaboration)

Abstract (from CDS):

Chemically peculiar stars in dwarf galaxies provide a window for exploring the birth environment of stars with varying chemical enrichment. We present a chemical abundance analysis of the brightest star in the newly discovered ultra-faint dwarf galaxy candidate Tucana III. Because it is particularly bright for a star in an ultra-faint Milky Way (MW) satellite, we are able to measure the abundance of 28 elements, including 13 neutron-capture species. This star, DES J235532.66-593114.9 (DES J235532), shows a mild enhancement in neutron-capture elements associated with the r-process and can be classified as an r-I star. DES J235532 is the first r-I star to be discovered in an ultra-faint satellite, and Tuc III is the second extremely low-luminosity system found to contain r-process enriched material, after Reticulum II. Comparison of the abundance pattern of DES J235532 with r-I and r-II stars found in other dwarf galaxies and in the MW halo suggests a common astrophysical origin for the neutron-capture elements seen in all r-process enhanced stars. We explore both internal and external scenarios for the r-process enrichment of Tuc III and show that with abundance patterns for additional stars, it should be possible to distinguish between them.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: abundances - galaxies: dwarf - stars: abundances - stars: chemically peculiar - stars: chemically peculiar

VizieR on-line data: <Available at CDS (J/ApJ/838/44): table1.dat table2.dat>

Simbad objects: 49

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Number of rows : 49
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 Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
2 2MASS J01004244-3343090 RG* 01 00 42.4416724536 -33 43 09.094759788   18.42 16.983   15.576 ~ 16 0
3 BD-16 251 RG* 01 29 31.1311443552 -16 00 45.495314460 12.527 12.427 11.642 11.189 10.713 CEMP 318 0
4 2MASS J02373448-3456088 RG* 02 37 34.4965054992 -34 56 08.816996724   20.120 18.61   17.25 ~ 6 0
5 2MASS J02380051-3452334 RG* 02 38 00.5350569120 -34 52 34.019487804   19.869 18.6   17.23 ~ 5 0
6 [LDH2014] Fnx-rgb0522 RG* 02 38 02.6914978752 -34 37 03.529448616   19.807 18.517   17.154 ~ 4 0
7 [LHT2010] BL147 RG* 02 38 44.0541787219 -34 30 52.046563303           ~ 6 0
8 2MASS J02385092-3445351 RG* 02 38 50.9226962424 -34 45 35.382414456   19.887 18.47   17.06 ~ 6 0
9 [LHT2010] BL204 * 02 39 16.2620103072 -34 32 30.101458128     18.65   17.17 ~ 7 0
10 GB07 Fnx17 RG* 02 39 17.8282697688 -34 30 57.039860448     18.702   16.98 ~ 9 0
11 2MASS J02393411-3433333 RG* 02 39 34.1028400848 -34 33 33.267768948     18.464     ~ 7 0
12 2MASS J02395387-3429567 RG* 02 39 53.8678292952 -34 29 56.558760360   20.47 18.29   16.70 ~ 9 0
13 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
14 [LHT2010] BL311 RG* 02 40 22.6661213808 -34 31 31.198266228           ~ 9 0
15 DES J033447.93-540525.0 Pe* 03 34 47.9500542384 -54 05 24.970508448           ~ 14 0
16 [WMO2015] 79 RG* 03 34 54.2533761000 -54 05 57.980511384           ~ 16 0
17 [WMO2015] 129 RG* 03 34 57.5852522640 -54 05 31.339557060           ~ 17 0
18 [KCB2015] Reti 4 RG* 03 35 23.8544722128 -54 04 07.586442660           ~ 29 0
19 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 375 0
20 [KCB2015] Reti 15 RG* 03 35 48.0547676520 -54 03 49.765718808           ~ 14 0
21 [KCB2015] Reti 18 RG* 03 36 07.7638135488 -54 02 35.507879592           ~ 21 0
22 2MASS J06412197-5103430 RG* 06 41 21.9752956968 -51 03 43.201175940   19.059 17.803   16.436 ~ 10 0
23 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
24 [MOP93] 10 RG* 06 41 46.3699348104 -51 01 22.684004256   19.152 17.906   16.497 ~ 17 0
25 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
26 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 482 1
27 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 287 2
28 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 352 1
29 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
30 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2417 1
31 2MASS J15081004+6717248 RB? 15 08 10.0432980480 +67 17 24.941562756           ~ 16 0
32 2MASS J15082716+6710075 RB? 15 08 27.1610239728 +67 10 07.516993980   18.47 16.750   15.277 ~ 24 0
33 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
34 2MASS J15095862+6716200 RB? 15 09 58.6103318448 +67 16 20.032584024   18.53 17.006   15.614 ~ 41 0
35 2MASS J15102712+6724362 RB? 15 10 27.1073026128 +67 24 36.149053896     16.971   15.607 ~ 16 0
36 Olsz N37 RB? 15 11 05.7208623168 +67 13 15.443761080     17.110   15.686 ~ 14 0
37 Irwin UMi 27940 LP* 15 11 24.2845884648 +67 33 50.159645604           ~ 14 0
38 2MASS J15133030+6706368 RB? 15 13 30.2881618176 +67 06 36.839132856           ~ 15 0
39 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
40 Irwin Dra 21456 Pe* 17 18 10.3883104824 +57 52 09.013807560     17.15     ~ 13 0
41 2MASS J17193545+5758465 RG* 17 19 35.4526699200 +57 58 46.544742804   18.286 17.488 16.681 15.978 ~ 18 0
42 Irwin Dra 21604 * 17 19 36.3076502448 +57 51 24.823104336   18.225 17.424 16.580 15.912 ~ 10 0
43 [BS61] 11 RG* 17 20 05.6705078064 +57 57 52.723124172   18.82 17.679 16.877 16.318 ~ 17 0
44 2MASS J17201351+5751591 * 17 20 13.5263169960 +57 51 59.175138240   18.432 17.714 16.919 16.389 ~ 18 0
45 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
46 [BS61] 119 RG* 17 20 16.1310888024 +57 52 55.986313692   18.62 17.635 16.859 16.224 ~ 38 0
47 BPS CS 22892-0052 Pe* 22 17 01.6558764360 -16 39 27.051026544   14.03 13.20 13.06 12.19 KIIvw 472 0
48 DES J235532.68-593115.0 * 23 55 32.6946605952 -59 31 15.049317072           ~ 9 0
49 NAME Tuc III G 23 56.6 -59 36           ~ 229 0

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