Colour-magnitude diagrams of the inner halo globular clusters NGC 5986 and NGC 6712

Details Colour-magnitude diagrams of the inner halo globular clusters NGC 5986 and NGC 6712 Colour-magnitude diagrams of the inner halo globular clusters NGC 5986 and NGC 6712

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...362..953o&link_type=abstract

Astronomy and Astrophysics, v.362, p.953-958 (2000)

Astronomy and Astrophysics

Astrophysics

4

Stars: Hertzsprung-Russell (Hr) And C-M Diagrams, Galaxy: Globular Clusters: Individual: Ngc 5986, Ngc 6712

Scientific paper

We present V and I photometry for NGC 5986 and B and V for NGC 6712. NGC 5986 has a blue extended horizontal branch, while NGC 6712 has a composite red and blue horizontal branch, where the latter extends to unusual bluer colours. Both clusters have RR Lyrae. We derive a reddening E(B-V) ~ 0.29 and a distance from the Sun dsun ~ 11.2 kpc for NGC 5986, and E(B-V) ~ 0.33 and dsun ~ 7.9 kpc for NGC 6712. Their galactocentric distances of RGC = 5.2 and 3.6 kpc respectively, locate them in the inner halo; NGC 6712 could be considered to be located in the bulge. NGC 6712 has |z| ~ 500 pc, indicating that the cluster is crossing the disk. We estimate metallicities of [Fe/H] = -1.6 and -1.0 respectively for NGC 5986 and NGC 6712. Observations collected at the European Southern Observatory -- ESO, Chile, proposal no. 64L-0212(A)

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