2001A&A...376..878O


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.08CET20:40:44

2001A&A...376..878O - Astronomy and Astrophysics, volume 376, 878-884 (2001/9-4)

HST NICMOS photometry of the reddened bulge globular clusters NGC 6528, Terzan 5, Liller 1, UKS 1 and Terzan 4.

ORTOLANI S., BARBUY B., BICA E., RENZINI A., ZOCCALI M., RICH R.M. and CASSISI S.

Abstract (from CDS):

We present results from NICMOS Hubble Space Telescope observations of the reddened bulge globular clusters NGC 6528, Terzan 5, Liller 1, UKS 1 and Terzan 4, obtained through the filters F110W (1.1µm) and F160W (1.6µm) (nearly equivalent to J and H). For the first time the turnoff region of Liller 1 and the main sequence of Terzan 5 and Terzan 4 are reached, as well as the horizontal branch of UKS 1. The magnitude difference between the turnoff and the red horizontal branch Δm110=m110HB-m110TO is used as an age indicator. From comparisons with new isochrones in the NICMOS photometric system, we conclude that the two metal-rich clusters NGC 6528 and Terzan 5 are coeval within uncertainties (∼20%) with 47 Tucanae. Liller 1 and UKS 1 are confirmed as metal-rich globular clusters. Terzan 4 is confirmed as an interesting case of a metal-poor cluster in the bulge with a blue horizontal branch.

Abstract Copyright:

Journal keyword(s): Galaxy: globular clusters: individual: NGC 6528, Terzan 5, Liller 1, Terzan 4, UKS 1 - stars: CM diagram

Simbad objects: 7

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Number of rows : 7

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 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3620 0
2 GCl 66.1 GlC 17 30 38.90 -31 35 44.0           ~ 99 0
3 C 1730-333 GlC 17 33 24.50 -33 23 20.0           ~ 212 2
4 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 717 1
5 NAME UKS 1 GlC 17 54 27.20 -24 08 43.0           ~ 68 0
6 NGC 6528 GlC 18 04 49.61 -30 03 20.8   12.12 10.65     ~ 475 0
7 NGC 6553 GlC 18 09 15.68 -25 54 27.9   9.08       ~ 545 0

    Equat.    Gal    SGal    Ecl

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2021.03.08-20:40:44

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