Astronomy and Astrophysics, volume 374, 554-563 (2001/8-1)
Open clusters or their remnants: B and V photometry of NGC 1901 and NGC 1252.
PAVANI D.B., BICA E., DUTRA C.M., DOTTORI H., SANTIAGO B.X., CARRANZA G. and DIAZ R.J.
Abstract (from CDS):
Photometry in the B and V bands is presented for the southern stellar groups NGC 1901 and NGC 1252. NGC 1901 is often described as an open cluster while NGC 1252 consists of a concentration of about 20 stars centered ≃20' north of the original New General Catalogue coordinates, and at the southwest edge of the large region previously assigned to this object in the literature. NGC1901 has a clear main sequence and shares similarities with the Hyades. We derive a reddening value E(B-V)=0.04, a distance from the Sun d☉=0.45kpc (Z=-0.23kpc) and an age 0.6±0.1Gyr. NGC 1901 is conclusively a physical system, dynamically comparable to or more evolved than the Hyades. The colour-magnitude diagram of NGC 1252 suggests a turnoff and main sequence, and a total of 12 probable members. We simulated the Galactic field colour-magnitude diagram in the same direction and found it to be a poor match to NGC 1252, suggesting that NGC 1252 is not a field fluctuation. Isochrone fitting to the probable members is consistent with E(B-V)=0.02, d☉=0.64kpc (Z=-0.46kpc) and an age 3±1Gyr. NGC 1252 cannot be ruled out as a physical group with the available data. If so, evidence is found that it is not a classical open cluster, but rather an open cluster remnant.
galaxy: open clusters and stellar associations - galaxies: individual: NGC 1901, NGC 1252
Table 2: Cl* NGC 1901 PBD N (Nos 1-4).
Status at CDS:
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