2023ApJ...955...17H

Query : 2023ApJ...955...17H

2023ApJ...955...17H - Astrophys. J., 955, 17 (2023/September-3)

GHOST Commissioning Science Results: Identifying a New Chemically Peculiar Star in Reticulum II.

HAYES C.R., VENN K.A., WALLER F., JENSEN J., McCONNACHIE A.W., PAZDER J., SESTITO F., ANTHONY A., BAKER G., BASSETT J., BENTO J., BERG T., BURLEY G., BRZESKI J., CASE S., CHAPIN E., CHIN T., CHISHOLM E., CHURILOV V., DENSMORE A., DIAZ R., DUNN J., EDGAR M., FARRELL T., FIRPO V., FITZSIMMONS J., FONT-SERRA J., FUENTES J., GANTON C., GOMEZ-JIMENEZ M., HARDY T., HENDERSON D., HILL A., HOFF B., IRELAND M., KALARI V., KELLY N., KLAUSER U., KONDRAT Y., LABRIE K., LAMBERT S., LUVAUL L., LAWRENCE J., LOTHROP J., MACDONALD G.S., MALI S., MARGHEIM S., McDERMID R., McGREGOR H., MILLER B., MIRANDA F., MULLER R., NIELSEN J., NORBURY R., OBERDORF O., PAI N., PEREZ G., PRADO P., PRICE I., QUIROZ C., RESHETOV V., ROBERTSON G., RUIZ-CARMONA R., SALINAS R., SEBO K.M., SHEINIS A., SHETRONE M., SHORTRIDGE K., SILVERSIDES K., SILVA K., SIMPSON C., SMITH G., SZETO K., TIMS J., TORO E., URRUTIA C., VENKATESAN S., WALLER L., WEVERS I., WIERZBICKI R., WHITE M., YOUNG P. and ZHELEM R.

Abstract (from CDS):

The Gemini High-resolution Optical SpecTrograph (GHOST) is the newest high-resolution spectrograph to be developed for a large-aperture telescope, recently deployed and commissioned at the Gemini-South telescope. In this paper, we present the first science results from the GHOST spectrograph taking during its commissioning runs. We have observed the bright metal-poor benchmark star HD 122563, along with two stars in the ultrafaint dwarf galaxy Reticulum II (Ret II), one of which was previously identified as a candidate member, but did not have a previous detailed chemical abundance analysis. We find that this candidate (GDR3 0928) to be a bona fide member of Ret II, and from a spectral synthesis analysis it is also revealed to be a CEMP-r star, with significant enhancements in several light elements (C, N, O, Na, Mg, and Si), in addition to featuring an r-process enhancement like many other Ret II stars. The light-element enhancements in this star resemble the abundance patterns seen in the CEMP-no stars of other ultrafaint dwarf galaxies, and are thought to have been produced by an independent source from the r-process. These unusual abundance patterns are thought to be produced by faint supernovae, which may be produced by some of the earliest generations of stars.

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

Journal keyword(s): Dwarf galaxies - Chemically peculiar stars - Chemical abundances - High resolution spectroscopy - Observational astronomy

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 19

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Number of rows : 19
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 [KCB2015] Reti 4 RG* 03 35 23.8544722128 -54 04 07.586442660           ~ 29 0
2 [WMO2015] 115 RG* 03 35 31.1536864104 -54 01 48.157854492           ~ 17 0
3 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 375 0
4 DES J033556.28-540316.3 RG* 03 35 56.2923112560 -54 03 16.203729492           ~ 12 0
5 [KCB2015] Reti 18 RG* 03 36 07.7638135488 -54 02 35.507879592           ~ 21 0
6 Gaia DR3 4732600514724860928 Pe* 03 36 27.6778181664 -53 58 26.228810820           ~ 5 0
7 NAME Ret GlC 04 36 10.15 -58 51 34.8   14.00 14.25 13.50   ~ 177 1
8 NAME Car III Dwarf Galaxy G 07 38 31.2 -57 53 59           ~ 81 0
9 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
10 2MASS J10081444+1605011 RB? 10 08 14.4415595736 +16 05 01.198034340           ~ 27 1
11 GrW 170817 GWE 13 09 48.0850 -23 22 53.343           ~ 2683 0
12 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
13 2MASS J14000985+1428228 * 14 00 09.8519784912 +14 28 22.997618256           ~ 15 0
14 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
15 TYC 7325-920-1 HB* 15 21 39.9538571520 -35 38 09.321499716   12.940 12.269 12.225 11.343 CEMP 22 0
16 BPS CS 22892-0052 Pe* 22 17 01.6558764360 -16 39 27.051026544   14.03 13.20 13.06 12.19 KIIvw 472 0
17 [SSW2012] Pisces II 10694 * 22 58 25.0754200608 +05 57 20.109688668           ~ 8 0
18 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 283 0
19 BPS CS 22945-0017 Pe* 23 20 55.6277405064 -63 15 36.786796848   14.83 14.44 14.50   ~ 30 0

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