1999A&AS..136..237O


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.17CEST17:18:43

1999A&AS..136..237O - Astron. Astrophys., Suppl. Ser., 136, 237-243 (1999/April-2)

Colour-magnitude diagrams of the post-core collapse globular clusters NGC 6256 and NGC 6717 (Palomar 9).

ORTOLANI S., BARBUY B. and BICA E.

Abstract (from CDS):

We present photometry of the globular clusters NGC 6256 in V, I, NGC 6717, NGC 6256 in V, I, and NGC 6717 in B, V, obtaining cluster parameters. NGC 6256 has a post core-collapse structure, while such feature is suspected for NGC 6717. Both clusters are projected on the bulge. From the colour-magnitude diagrams for NGC 6256 we derive reliable cluster parameters which considerably revise its properties, with respect to previous literature. It has a blue-extended Horizontal Branch already observed in other post-core collapse clusters in the bulge, such as HP1. We derive a reddening of E(B-V) = 1.10, a distance d ≃6.4 kpc, and an intermediate metallicity for NGC 6256. NGC 6717 presents a blue Horizontal Branch. We derive a reddening of E(B-V) = 0.23 and a distance d ≃7.1 kpc, locating the cluster in the bulge. The photometry is deep and we study the luminosity function, which presents some evidence of depletion of Main Sequence stars. This effect is not unexpected for such a poorly populated Palomar cluster in the bulge. We also estimate the cluster age from the magnitude difference between the horizontal branch and the turnoff. We obtain ΔVTOHB = 3.7, which would place this intermediate metallicity bulge globular as coeval with the halo.

Abstract Copyright:

Journal keyword(s): Galaxy: globular clusters: individual: NGC 6256, NGC 6717 (Palomar 9) - HR diagram

Simbad objects: 9

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Number of rows : 9

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 6256 GlC 16 59 32.68 -37 07 17.1           ~ 125 0
2 ESO 455-11 GlC 17 31 05.20 -29 58 54.0           ~ 140 0
3 NGC 6522 GlC 18 03 34.08 -30 02 02.3   10.68 9.48     ~ 471 1
4 NGC 6540 GlC 18 06 08.60 -27 45 55.0           ~ 94 0
5 NGC 6553 GlC 18 09 15.68 -25 54 27.9   9.08       ~ 548 0
6 NGC 6558 GlC 18 10 18.38 -31 45 48.6   12.39 11.29     ~ 190 0
7 ESO 522-1 GlC 18 12 15.80 -22 44 31.0     14.86     ~ 79 1
8 NGC 6717 GlC 18 55 06.04 -22 42 05.3   11.29 10.35     ~ 206 0
9 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1847 0

    Equat.    Gal    SGal    Ecl

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2021.05.17-17:18:43

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