2008AJ....136.1407D


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.06CEST05:29:16

2008AJ....136.1407D - Astron. J., 136, 1407-1414 (2008/October-0)

Globular clusters in the outer galactic halo: AM-1 and Palomar 14.

DOTTER A., SARAJEDINI A. and YANG S.-C.

Abstract (from CDS):

AM-1, at ∼120 kpc, and Palomar 14 (Pal 14), at ∼70 kpc, are two of the most distant Galactic globular clusters (GCs) known. We present Hubble Space Telescope Wide Field Planetary Camera 2 photometry of AM-1 and Pal 14 that reveals unprecedented depth and detail in the color-magnitude diagrams of these two clusters. Absolute and relative age measurements confirm that both are younger than the inner halo GC M 3 by 1.5-2 Gyr assuming all three clusters have similar compositions. Thus AM-1 and Pal 14 join Pal 3, Pal 4, and Eridanus as distant GCs with red horizontal branches (HBs) and young ages relative to the inner halo. Within the context of the entire body of research on the ages of second parameter GCs, the observed correlation between age and HB morphology suggests that age is the best candidate for the second parameter. However, this conclusion is tempered by the lack of precise chemical abundance determinations for a significant fraction of second parameter GCs.

Abstract Copyright:

Journal keyword(s): globular clusters: individual: AM-1, Palomar 14, M3

Simbad objects: 18

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Number of rows : 18

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 950 0
2 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 973 0
3 NAME E 1 GlC 03 55 02.5 -49 36 52           ~ 185 0
4 NAME CL ERID 1 GlC 04 24 44.5 -21 11 13           ~ 162 1
5 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 843 0
6 NAME PYX GLOBULAR CL GlC 09 07 57.80 -37 13 17.0           ~ 86 0
7 NAME Sextans C GlC 10 05 30.96 +00 04 15.4   15.5 13.9     ~ 299 1
8 GCl 17 GlC 11 29 16.80 +28 58 25.0   14.4       ~ 324 1
9 C 1235-509 GlC 12 38 40.20 -51 09 01.0           ~ 332 0
10 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2310 0
11 IC 4499 GlC 15 00 18.57 -82 12 49.6     8.56     ~ 320 0
12 M 5 GlC 15 18 33.22 +02 04 51.7   7.34 5.95     ~ 1814 0
13 GCl 38 GlC 16 10 59.00 +14 57 42.0           ~ 336 0
14 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2046 0
15 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 1942 0
16 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12154 0
17 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1836 2
18 Cl Pal 12 GlC 21 46 38.84 -21 15 09.4     11.89     ~ 465 0

    Equat.    Gal    SGal    Ecl

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2021.05.06-05:29:16

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