2015A&A...581A..13D


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST04:04:34

2015A&A...581A..13D - Astronomy and Astrophysics, volume 581A, 13-13 (2015/9-1)

Ghosts of Milky Way's past: the globular cluster ESO 37-1 (E3).

DE LA FUENTE MARCOS R., DE LA FUENTE MARCOS C., MONI BIDIN C., ORTOLANI S. and CARRARO G.

Abstract (from CDS):

In the Milky Way, most globular clusters are highly conspicuous objects that were found centuries ago. However, a few dozen of them are faint, sparsely populated systems that were identified largely during the second half of the past century. One of the faintest is ESO37-1 (E3) and as such it remains poorly studied, with no spectroscopic observations published so far although it was discovered in 1976. We investigate the globular cluster E3 in an attempt to better constrain its fundamental parameters. Spectroscopy of stars in the field of E3 is shown here for the first time. Deep, precise VI CCD photometry of E3 down to V∼26mag is presented and analysed. Low-resolution, medium signal-to-noise ratio spectra of nine candidate members are studied to derive radial velocity and metallicity. Proper motions from the UCAC4 catalogue are used to explore the kinematics of the bright members of E3. Isochrone fitting indicates that E3 is probably very old, with an age of about 13 Gyr; its distance from the Sun is nearly 10kpc. It is also somewhat metal rich with [Fe/H]=-0.7. Regarding its kinematics, our tentative estimate for the proper motions is (µαcosδ, µδ)=(-7.0±0.8, 3.5±0.3)mas/yr (or a tangential velocity of 382±79km/s) and for the radial velocity 45±5km/s in the solar rest frame. E3 is one of the most intriguing globular clusters in the Galaxy. Having an old age and being metal rich is clearly a peculiar combination, only seen in a handful of objects like the far more conspicuous NGC104 (47Tucanae). In addition, its low luminosity and sparse population make it a unique template for the study of the final evolutionary phases in the life of a star cluster. Unfortunately, E3 is among the most elusive and challenging known globular clusters because field contamination severely hampers spectroscopic studies.

Abstract Copyright:

Journal keyword(s): globular clusters: general - globular clusters: individual: ESO 37-1 - Galaxy: halo - Galaxy: structure - Local Group

VizieR on-line data: <Available at CDS (J/A+A/581/A13): table.dat>

Status at CDS:   All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 16

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Number of rows : 16

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3547 0
2 NAME Sgr Stream St* 02 22 +00.0           ~ 644 0
3 UCAC4 064-008471 * 09 19 23.4875939845 -77 14 38.718829250   17.00 15.47 15.27   ~ 1 0
4 UCAC4 065-008924 * 09 19 41.6163659281 -77 08 06.576921690       16.33   ~ 1 0
5 UCAC4 064-008502 * 09 20 31.1431055617 -77 16 32.943311635   15.38 14.12 14.48   ~ 1 0
6 [MKT2000] V2 V* 09 20 31.5692899227 -77 18 19.376353904   18.83 18.17     ~ 2 0
7 UCAC4 064-008511 * 09 20 42.2148099371 -77 17 34.521920511       16.34   ~ 1 0
8 2MASS J09204780-7715360 SX* 09 20 47.81 -77 15 36.0   18.08 17.48   16.62 ~ 4 0
9 NAME E 3 GlC 09 20 57.07 -77 16 54.8           ~ 128 0
10 NAME Cha Dark Cloud SFR 11 55 -78.0           ~ 556 1
11 M 107 GlC 16 32 31.86 -13 03 13.6   9.96 8.85     ~ 702 0
12 ESO 454-29 GlC 17 27 33.24 -30 48 07.8           ~ 211 0
13 NGC 6362 GlC 17 31 54.99 -67 02 54.0   9.72 8.86     ~ 487 0
14 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11535 0
15 NGC 6652 GlC 18 35 45.63 -32 59 26.6   10.64 9.75     ~ 349 0
16 NAME Local Group GrG ~ ~           ~ 6970 0

    Equat.    Gal    SGal    Ecl

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2020.07.08-04:04:34

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