The intermediate-age open clusters Ruprecht 61, Czernik 32, NGC 2225 and 2262 |
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| Authors: | G Carraro † G Baume R A Vázquez A Moitinho D Geisler |
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| Institution: | Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile;Astronomy Department, Yale University, PO Box 208101, New Haven, CT 06520-8101, USA;Facultad de Ciencias Astronómicas y Geofísicas de la UNLP, IALP-CONICET, Paseo del Bosque s/n, La Plata, Argentina;CAAUL, Observatório Astronómico de Lisboa, Tapada da Ajuda, 1349-018 Lisboa, Portugal;Universidad de Concepción, Departamento de Fisica, Casilla 160-C, Concepción, Chile |
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| Abstract: | We present the first BVI CCD photometry to V = 22.0 of four fields centred on the region of the southern Galactic star clusters Ruprecht 61, Czernik 32, NGC 2225 and 2262 and of four displaced control fields. These clusters have never been studied before, and we provide for the first time estimates of their fundamental parameters, specifically radial extent, age, distance and reddening. We find that the four clusters are all of intermediate age (around 1 Gyr), close to the Sun and possess lower than solar metal abundance. |
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| Keywords: | open clusters and associations: general open clusters and associations: individual: Ruprecht 61 open clusters and associations: individual: Czernik 32 open clusters and associations: individual: NGC 2225 open clusters and associations: individual: NGC 2262 |
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