EDP Sciences
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Volume 381, Number 3, January III 2002
Page(s) 884 - 893
Section Stellar clusters and associations
DOI http://dx.doi.org/10.1051/0004-6361:20011633

A&A 381, 884-893 (2002)
DOI: 10.1051/0004-6361:20011633

NGC 2571: An intermediate-age open cluster with a White Dwarf candidate

E. E. Giorgi1, 2, R. A. Vàzquez1, G. Baume1, 3, W. Seggewiss4 and J.-M. Will4

1  Facultad de Ciencias Astronómicas y Geofísicas, UNLP, and IALP (UNLP-CONICET), Paseo del Bosque s/n, 1900, La Plata, Argentina
2  Fellow of Comisión de Investigaciones Científicas de la Provincia de Buenos Aires, Argentina
3  Post-doctoral fellow of CONICET
4  Sternwarte der Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany

(Received 3 August 2001 / Accepted 18 October 2001 )

CCD UBVI imaging photometry was carried out in the field of the open cluster NGC 2571. From the analysis of our data we state the cluster is at a distance of 1380 $\pm$ 130 pc and its age is $50 \pm 10 \times 10^{6}$ yr. The cluster mass function has a slope larger than a typical Salpeter's law. There are two notorious features in NGC 2571: the cluster contains a high proportion of stars located below the reference line that are serious candidates to be metallic line stars (probably Am-Fm), and shows also a sharp gap along its main sequence that cannot be explained by a random process nor by a biased rejection of cluster members. A striking blue object was detected in the cluster field that could be a white dwarf candidate.

Key words: open clusters and associations: individual: NGC 2571 -- stars: luminosity function, mass function -- H-R diagrams -- stars: chemically peculiar -- stars: blue stragglers

Offprint request: E. Giorgi, egiorgi@fcaglp.edu.ar

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