Deep photometry of NGC 5694 and Terzan 8 Virtual Observatory Resource

Authors
  1. Ortolani S.,Gratton R.
  2. Published by
    CDS
Abstract

We present deep CCD photometries for the little known metal-poor clusters NGC 5694 and Terzan 8 down to V~24. NGC 5694 has a blue horizontal branch, a very high radial velocity, a metallicity of [Fe/H]=-1.65+/-0.06, a reddening of E(B-V)=0.10+/-0.03, and an apparent distance modulus of (m-M)_v_=17.82+/-0.15. It is located at 26.0+/-1.8kpc from the galactic center. The helium content derived from the ratio between the number of stars on the horizontal branch and the giant and asymptotic giant branches is consistent with that obtained for other clusters. Terzan 8 is a metal-poor ([Fe/H]=-1.81+/-0.10) moderately reddened (E(B-V)=0.20+/-0.05) cluster with a blue horizontal branch and apparent distance modulus of (m-M)_v_=17.25+/-0.15. It is located at 13.8+/-2.0 kpc from the galactic center. The c-m diagram and the luminosity function of NGC 5694 and Terzan 8 are similar to the M92 ones. NGC 5694 and Terzan 8 have ages close to that of the "classical" globular cluster M92.

Keywords
  1. Globular star clusters
  2. CCD photometry
Bibliographic source Bibcode
1990A&AS...82...71O
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+AS/82/71
IVOA Identifier IVOID
ivo://CDS.VizieR/J/A+AS/82/71
Document Object Identifer DOI

Access

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https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+AS/82/71
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+AS/82/71
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History

1997-12-09T19:49:31Z
Resource record created
1997-12-09T18:49:36Z
Updated
1997-12-09T19:49:31Z
Created

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr