Deep photometry of NGC 5694 and Terzan 8 (Ortolani+, 1990)

Details Deep photometry of NGC 5694 and Terzan 8 (Ortolani+, 1990) Deep photometry of NGC 5694 and Terzan 8 (Ortolani+, 1990)

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ycat..40820071o&link_type=abstract

VizieR On-line Data Catalog: J/A+AS/82/71. Originally published in: 1990A&AS...82...71O

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Clusters: Globular, Photometry: Ccd

Scientific paper

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. (2 data files).

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