2019A&A...632A..55K


Query : 2019A&A...632A..55K

2019A&A...632A..55K - Astronomy and Astrophysics, volume 632A, 55-55 (2019/12-0)

An outer shade of Pal: Abundance analysis of the outer halo globular cluster Palomar 13.

KOCH A. and COTE P.

Abstract (from CDS):

At a Galactocentric distance of 27kpc, Palomar 13 is an old globular cluster (GC) belonging to the outer halo. We present a chemical abundance analysis of this remote system from high-resolution spectra obtained with the Keck/HIRES spectrograph. Owing to the low signal-to-noise ratio of the data, our analysis is based on a coaddition of the spectra of 18 member stars. We are able to determine integrated abundance ratios for 16 species of 14 elements, of α-elements (Mg, Si, Ca, and Ti), Fe-peak (Sc, Mn, Cr, Ni, Cu, and Zn), and neutron-capture elements (Y and Ba). While the mean Na abundance is found to be slightly enhanced and halo-like, our method does not allow us to probe an abundance spread that would be expected in this light element if multiple populations are present in Pal 13. We find a metal-poor mean metallicity of -1.91±0.05 (statistical) ±0.22 (systematic), confirming that Pal 13 is a typical metal-poor representative of the outer halo. While there are some differences between individual α-elements, such as halo-like Mg and Si versus the mildly lower Ca and Ti abundances, the mean [α/Fe] of 0.34±0.06 is consistent with the marginally lower α component of the halo field and GC stars at similar metallicity. We discuss our results in the context of other objects in the outer halo and consider which of these objects were likely accreted. We also discuss the properties of their progenitors. While chemically, Pal 13 is similar to Gaia-Enceladus and some of its GCs, this is not supported by its kinematic properties within the Milky Way system. Moreover, its chemodynamical similarity with NGC 5466, a purported progeny of the Sequoia accretion event, might indicate a common origin in this progenitor. However, the ambiguities in the full abundance space of this comparison emphasize the difficulties in unequivocally labeling a single GC as an accreted object, let alone assigning it to a single progenitor.

Abstract Copyright: © ESO 2019

Journal keyword(s): techniques: spectroscopic - stars: abundances - Galaxy: abundances - Galaxy: evolution - Galaxy: halo - globular clusters: individual: Palomar 13

VizieR on-line data: <Available at CDS (J/A+A/632/A55): table1.dat table2.dat>

Simbad objects: 55

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Number of rows : 55
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 988 0
2 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1016 0
3 NGC 1261 GlC 03 12 16.21 -55 12 58.4     8.63     ~ 473 0
4 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1335 0
5 M 79 GlC 05 24 10.59 -24 31 27.3   9.21 8.16     ~ 766 0
6 NGC 2298 GlC 06 48 59.41 -36 00 19.1   10.77 8.89     ~ 462 0
7 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 880 0
8 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1339 0
9 NGC 4833 GlC 12 59 33.92 -70 52 35.4   8.72 7.79     ~ 384 0
10 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2378 0
11 NGC 5466 GlC 14 05 27.29 +28 32 04.0   10.5 9.70     ~ 780 0
12 NGC 5634 GlC 14 29 37.28 -05 58 35.1   10.69 10.05     ~ 279 0
13 NGC 5694 GlC 14 39 36.52 -26 32 18.0   11.58 10.89     ~ 284 0
14 IC 4499 GlC 15 00 18.57 -82 12 49.6     8.56     ~ 329 0
15 NGC 5824 GlC 15 03 58.612 -33 04 06.70   10.28 9.56     ~ 379 0
16 NGC 5897 GlC 15 17 24.40 -21 00 36.4   10.16 8.52     ~ 363 0
17 GCl 38 GlC 16 10 59.00 +14 57 42.0           ~ 346 0
18 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2107 0
19 NGC 6229 GlC 16 46 58.641 +47 31 36.38   9.38 9.86     ~ 343 0
20 GCl 50 GlC 16 59 51.1 -00 32 00   15.70       ~ 180 1
21 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2001 0
22 NAME Sequoia Cluster GlC 17 31 12.0 -39 48 30           ~ 57 0
23 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1968 2
24 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1002 0
25 M 56 GlC 19 16 35.57 +30 11 00.5   8.90       ~ 393 0
26 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 401 0
27 Cl Arp 2 GlC 19 28 44.11 -30 21 20.3     12.41     ~ 332 0
28 Cl Terzan 8 GlC 19 41 44.41 -33 59 58.1     11.54     ~ 294 0
29 M 75 GlC 20 06 04.841 -21 55 20.14     8.26     ~ 340 0
30 NGC 7006 GlC 21 01 29.465 +16 11 16.49     10.46     ~ 504 0
31 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 968 1
32 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 983 0
33 Cl Pal 12 GlC 21 46 38.84 -21 15 09.4     11.89     ~ 491 0
34 Cl* Palomar 13 CDM 910 RG* 23 06 39.3698627280 +12 47 35.216150352   20.01 19.28     ~ 6 0
35 Cl* Palomar 13 ORS 18 RG* 23 06 39.9800887056 +12 44 47.097929472   20.35 19.62     ~ 5 0
36 Cl* Palomar 13 SMC 46 RG* 23 06 42.0042373632 +12 45 26.409160944   18.91 18.02     ~ 5 0
37 Cl* Palomar 13 HS 2 * 23 06 43.1519086296 +12 46 34.100177160   18.31 17.78     ~ 6 0
38 Cl* Palomar 13 SMC 174 * 23 06 43.4153517960 +12 46 08.060688192   20.42 19.50     ~ 6 0
39 Cl* Palomar 13 CDM 30 RG* 23 06 43.8197671296 +12 45 36.049666968   19.73 18.98     ~ 7 0
40 Cl* Palomar 13 CDM 915 * 23 06 43.960 +12 46 20.20   20.31 19.58     ~ 4 0
41 Cl* Palomar 13 CSB 4 RG* 23 06 44.4358114272 +12 46 10.141514904   19.78 18.82     ~ 7 0
42 Cl* Palomar 13 SMC 34 V* 23 06 44.48 +12 46 15.7   18.47 17.88     ~ 6 0
43 GCl 124 GlC 23 06 44.48 +12 46 19.2   15.6       ~ 254 1
44 Cl* Palomar 13 CSB 1 * 23 06 44.6551587888 +12 46 29.642716884   19.27 18.58     ~ 6 0
45 Cl* Palomar 13 CSB 5 RG* 23 06 44.8567260408 +12 46 30.335338524   19.55 18.82     ~ 7 0
46 Cl* Palomar 13 CSB 14 * 23 06 45.0147562104 +12 45 55.985785704   20.48 19.750     ~ 5 0
47 Cl* Palomar 13 ORS 5 RG* 23 06 45.3773288040 +12 44 21.303491892   20.58 19.86     ~ 5 0
48 Cl* Palomar 13 CSB 10 * 23 06 45.5912617104 +12 45 39.342272976   20.39 19.65     ~ 5 0
49 Cl* Palomar 13 CSB 13 RG* 23 06 45.6604858200 +12 46 21.784235340   20.45 19.73     ~ 6 0
50 Cl* Palomar 13 ORS 41 RG* 23 06 48.2784994152 +12 45 46.486063332   19.35 18.59     ~ 6 0
51 2MASS J23064851+1246189 RG* 23 06 48.5174235672 +12 46 19.085841660   18.49 17.64     ~ 6 0
52 Cl* Palomar 13 ORS 31 * 23 06 49.9487811960 +12 45 27.862160688   18.59 17.76     ~ 5 0
53 2MASS J23065009+1247139 RG* 23 06 50.1000150120 +12 47 14.024117292   17.93 17.00     ~ 6 0
54 NGC 7492 GlC 23 08 26.68 -15 36 41.3     10.48     ~ 281 0
55 NAME Gaia Enceladus-Sausage St* ~ ~           ~ 295 0

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2022.08.08-04:19:40

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