Astronomy and Astrophysics – Astrophysics
Scientific paper
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)
Barbuy Batriz
Bica Eduardo
Catelan Márcio
Momany Yazan
Ortolani Sergio
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