2023ApJ...959..141W

Query : 2023ApJ...959..141W

2023ApJ...959..141W - Astrophys. J., 959, 141 (2023/December-3)

Chemical Analysis of the Brightest Star of the Cetus II Ultrafaint Dwarf Galaxy Candidate.

WEBBER K.B., HANSEN T.T., MARSHALL J.L., SIMON J.D., PACE A.B., MUTLU-PAKDIL B., DRLICA-WAGNER A., MARTINEZ-VAZQUEZ C.E., AGUENA M., ALLAM S.S., ALVES O., BERTIN E., BROOKS D., CARNERO ROSELL A., CARRETERO J., DA COSTA L.N., DE VICENTE J., DOEL P., FERRERO I., FRIEDEL D., FRIEMAN J., GARCIA-BELLIDO J., GIANNINI G., GRUEN D., GRUENDL R.A., HINTON S.R., HOLLOWOOD D.L., HONSCHEID K., KUEHN K., MENA-FERNANDEZ J., MENANTEAU F., MIQUEL R., OGANDO R.L.C., PEREIRA M.E.S., PIERES A., PLAZAS MALAGON A.A., SANCHEZ E., SANTIAGO B., SMITH J.A., SMITH M., SUCHYTA E., TARLE G., TO C., WEAVERDYCK N. and YANNY B.

Abstract (from CDS):

We present a detailed chemical abundance analysis of the brightest star in the ultrafaint dwarf (UFD) galaxy candidate Cetus II from high-resolution Magellan/MIKE spectra. For this star, DES J011740.53-173053, abundances or upper limits of 18 elements from carbon to europium are derived. Its chemical abundances generally follow those of other UFD galaxy stars, with a slight enhancement of the α-elements (Mg, Si, and Ca) and low neutron-capture element (Sr, Ba, and Eu) abundances supporting the classification of Cetus II as a likely UFD. The star exhibits lower Sc, Ti, and V abundances than Milky Way (MW) halo stars with similar metallicity. This signature is consistent with yields from a supernova originating from a star with a mass of ∼11.2 M⊙. In addition, the star has a potassium abundance of [K/Fe] = 0.81, which is somewhat higher than the K abundances of MW halo stars with similar metallicity, a signature that is also present in a number of UFD galaxies. A comparison including globular clusters and stellar stream stars suggests that high K is a specific characteristic of some UFD galaxy stars and can thus be used to help classify objects as UFD galaxies.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Chemical abundances - Stellar abundances

Status at CDS : Associated data (images, light curves, etc...) being ingested in VizieR.

Simbad objects: 39

goto Full paper

goto View the references in ADS

Number of rows : 39
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 UCAC4 363-001550 * 01 17 40.5406035615 -17 30 53.202822455   17.022 16.032     ~ 2 0
3 NAME Cetus II G 01 17.9 -17 25           ~ 56 0
4 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 575 2
5 NAME Aliqa Uma Stream St* 02 07 -31.5           ~ 33 0
6 NAME Tri II G 02 13 17.40 +36 10 42.4           ~ 164 0
7 NAME Segue 2 G 02 19 16.0 +20 10 31     15.2     ~ 299 0
8 NAME Sagittarius Stream St* 02 22 +00.0           ~ 1001 0
9 NAME Hor I G 02 55 31.7 -54 07 08           ~ 169 0
10 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 375 0
11 HD 26297 Pe* 04 09 03.4178692512 -15 53 27.056905800   8.55 7.47 7.09   G5/6IVw 168 0
12 M 79 GlC 05 24 10.59 -24 31 27.3     8.16     ~ 883 0
13 NAME Carina II Dwarf Galaxy G 07 36 25.6 -57 59 57           ~ 86 0
14 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 998 0
15 NAME Car III Dwarf Galaxy G 07 38 31.2 -57 53 59           ~ 81 0
16 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
17 HD 84937 Pe* 09 48 56.0992891997 +13 44 39.326709913 8.49 8.68 8.32 7.97 7.70 F8Vm-5 831 0
18 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
19 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
20 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 482 1
21 BD+29 2356 RG* 13 01 52.4291777760 +29 11 17.936259972   12.27 11.50     ~ 33 0
22 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
23 NAME Bootes II G 13 58 00.0 +12 51 00     15.4     ~ 269 0
24 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
25 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
26 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
27 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
28 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
29 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1164 0
30 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
31 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
32 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 913 0
33 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 1121 0
34 NAME Gru II G 22 04.1 -46 26           ~ 110 0
35 NAME Tuc II G 22 51 55.1 -58 34 08           ~ 192 0
36 NAME Grus I G 22 56 42.4 -50 09 48           ~ 126 0
37 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 283 0
38 NAME Tuc III G 23 56.6 -59 36           ~ 229 0
39 NAME ATLAS Stream St* ~ ~           ~ 44 0

To bookmark this query, right click on this link: simbad:objects in 2023ApJ...959..141W and select 'bookmark this link' or equivalent in the popup menu