EDP Sciences
Free access
Volume 410, Number 2, November I 2003
Page(s) 565 - 575
Section Stellar clusters and associations
DOI http://dx.doi.org/10.1051/0004-6361:20031280

A&A 410, 565-575 (2003)
DOI: 10.1051/0004-6361:20031280

Searching for unknown open clusters in the Tycho-2 catalog

B. S. Alessi1, A. Moitinho2, 3 and W. S. Dias1, 3

1  Universidade de São Paulo, Dept. de Astronomia, CP 3386, São Paulo 01060-970, Brazil
2  Observatorio Astronómico Nacional, UNAM, Apdo. Postal 877, C.P. 22800, Ensenada B.C., México
3  CAAUL, Observatório Astronómico de Lisboa, Tapada da Ajuda, 1349-018 Lisboa, Portugal

(Received 6 December 2002 / Accepted 8 August 2003)

We present 11 new open cluster candidates found in a systematic search for unknown star clusters using the astrometric and photometric data included in the Tycho 2 catalog. The possible existence of these stellar aggregates is supported by the analysis of proper motions, color-magnitude diagrams, stellar density distributions, and by the visual inspection of the Digitized Sky Survey (DSS) plates. With these tools we were able to determine mean absolute proper motions as well as preliminary reddenings, distances and ages for the majority of the candidates. We found that most of them are possibly nearby (closer than ~600 pc) open clusters never studied before.

Key words: Galaxy: open clusters and associations: general

Offprint request: W. S. Dias; wilton@usp.br

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