Bibcode
Bassino, L. P.; Waldhausen, S.; Martínez, R. E.
Referencia bibliográfica
Boletín de la Asociación Argentina de Astronomía, vol.41, p.75-76
Fecha de publicación:
0
1997
Número de citas
0
Número de citas referidas
0
Descripción
We present the preliminary results of BV(RI)KC CCD photometry
down to V = 21 mag. in the region of NGC 6994. To our knowledge, no
photometry has been previously reported for this object and we suggest
it to be a poor and sparse old open cluster. The colour excess is
estimated at EB-V = 0.10 ± 0.02 mag. by means of the
BVIC technique and the distance at approximately 500 pc.
(V0-MV = 8.5 ± 0.25 mag). As the galactic
latitude is b = -34o, this puts NGC 6994 at about 280 pc.
below the galactic plane. The theoretical isochrones (VandenBerg, 1985)
that are in better agreement with the data correspond to a range in age
of 2.5 - 4 Gyr., assuming solar metallicity. According to this results,
NGC 6994 probably belongs to the old open cluster population (ages of 1
Gyr. or greater) that are located in the outer disk and at large
distances from the galactic plane (Janes y Phelps, 1994).