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Open clusters or their remnants : B and V photometry of NGC 1901 and NGC 1252

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Open clusters or their remnants : B and V photometry of NGC 1901 and NGC 1252

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Título Open clusters or their remnants : B and V photometry of NGC 1901 and NGC 1252
Autor Pavani, Daniela Borges
Bica, Eduardo Luiz Damiani
Dutra, Carlos Maximiliano
Dottori, Horacio Alberto
Santiago, Basilio Xavier
Carranza, Gustavo Jose
Díaz, Rubén Joaquín
Abstract Photometry in the B and V bands is presented for the southern stellar groups NGC1901 and NGC1252. NGC1901 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 dʘ = 0.45 kpc (Z = −0.23 kpc) and an age 0.6 ± 0.1 Gyr. NGC1901 is conclusively a physical system, dynamically comparable to or more evolved than the Hyades. The colour-magnitude diagram of NGC1252 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 NGC1252, suggesting that NGC1252 is not a eld fluctuation. Isochrone fitting to the probable members is consistent with E(B − V ) = 0.02, dʘ = 0.64 kpc (Z = −0.46 kpc) and an age 3 ± 1 Gyr. NGC1252 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.
Contido em Astronomy and astrophysics. Les Ulis. Vol. 374, no. 2 (Aug. 2001), p. 554-563
Assunto Aglomerados estelares
Associações de estrelas
Fotometria astronômica
Fotometria estelar
[en] Galaxies: individual: NGC1901, NGC1252
[en] Galaxy: open clusters and stellar associations
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/98497
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