NGC 6318: a young, highly reddened open cluster in the Galactic center direction

PIATTI, ANDRÉS E.; CLARIA OLMEDO, JUAN JOSÉ; AHUMADA, A.V.

Bol. Asociación Argentina de Astronomía

Año: 2005 vol. 48 p. 192 - 195

We present CCD BVI photometry for the open cluster NGC 6318. Star counts carried out in the cluster field yield an angular radius of 8.0' for NGC 6318. The comparison of the cluster CMDs with isochrones of the Geneva group yields E(B-V) = 1.20 + 0.05, E(V-I) = 1.55 + 0.10 and V-Mv = 15.45 + 0.35 (d = 2.1 + 0.5 kpc) for log t = 8.20 (t = 160 Myr) and Z = 0.020. Among the known clusters in the line-of-sight of NGC 6318, Havlen-Moffat 1 and BH 222 are the farthest ones, while those located between 1 and 2 kpc from the Sun appear to be more absorbed than those expected to follow a quasi-linear extinction law.