2017ApJ...846...23O

Query : 2017ApJ...846...23O

2017ApJ...846...23O - Astrophys. J., 846, 23-23 (2017/September-1)

High-resolution spectroscopic abundances of red giant branch stars in NGC 6681.

O'MALLEY E.M., KNAIZEV A., McWILLIAM A. and CHABOYER B.

Abstract (from CDS):

We obtain high-resolution spectra of nine red giant branch stars in NGC 6681 and perform the first detailed abundance analysis of stars in this cluster. We confirm cluster membership for these stars based on consistent radial velocities of 214.5 ± 3.7 km s–1 and find a mean [Fe/H] = -1.63 ± 0.07 dex and [α/Fe] = 0.42 ± 0.11 dex. Additionally, we confirm the existence of a Na-O anti-correlation in NGC 6681 and identify two populations of stars with unique abundance trends. With the use of HST photometry from Sarajedini et al. and Piotto et al. we are able to identify these two populations as discrete sequences in the cluster CMD. Although we cannot confirm the nature of the polluter stars responsible for the abundance differences in these populations, these results do help put constraints on possible polluter candidates.

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

Journal keyword(s): globular clusters: individual: NGC 6681 M70 - methods: observational - stars: abundances - stars: fundamental parameters - stars: fundamental parameters

VizieR on-line data: <Available at CDS (J/ApJ/846/23): table1.dat table2.dat table3.dat table4.dat>

Nomenclature: Tables 1,3: [OKM2017] NGC 6681 NNNNN N=9 among (Nos 4025-30847).

Simbad objects: 23

goto Full paper

goto View the references in ADS

Number of rows : 23
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 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
3 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
4 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 1001 0
5 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
6 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
7 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 2095 0
8 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
9 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
10 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
11 [OKM2017] NGC 6681 8125 RG* 18 43 06.6867705816 -32 19 09.696824868     15.01   13.90 ~ 2 0
12 [OKM2017] NGC 6681 7247 RG* 18 43 08.5513815576 -32 19 00.005489688     14.50   13.31 ~ 2 0
13 M 70 GlC 18 43 12.76 -32 17 31.6           ~ 421 0
14 [OKM2017] NGC 6681 4025 RG* 18 43 13.5742072248 -32 18 28.758754260     13.51   12.16 ~ 2 0
15 [OKM2017] NGC 6681 30847 RG* 18 43 15.5118441792 -32 16 48.785216844     15.11   13.98 ~ 2 0
16 [OKM2017] NGC 6681 12720 RG* 18 43 15.6416594112 -32 18 07.071379812     14.07   12.81 ~ 2 0
17 [OKM2017] NGC 6681 12591 RG* 18 43 15.8507285640 -32 17 32.904480264     13.47   12.11 ~ 2 0
18 2MASS J18431591-3217008 RG* 18 43 15.9155222592 -32 17 00.931971660     12.74   10.95 ~ 3 0
19 [OKM2017] NGC 6681 11719 RG* 18 43 16.6427057664 -32 18 10.288347768     12.80   11.21 ~ 2 0
20 [OKM2017] NGC 6681 10683 RG* 18 43 18.1119873000 -32 17 50.630901144     13.14   11.69 ~ 2 0
21 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
22 M 71 GlC 19 53 46.49 +18 46 45.1           ~ 1190 0
23 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0

To bookmark this query, right click on this link: simbad:objects in 2017ApJ...846...23O and select 'bookmark this link' or equivalent in the popup menu