SCYON Abstract

Received on July 29 2004

NGC 5385, NGC 2664 and Collinder 21: three candidate Open Cluster Remnants

AuthorsS. Villanova (1), G. Carraro(2), R. de la Fuente Marcos(3), R. Stagni(1)
(1) Padova University
(2) Uchile/Yale
(3) Suffolk University-Madrid
Accepted byAstronomy & Astrophysics


We present CCD UBVI photometric and medium/high resolution spectroscopic observations obtained in the field of the previously unstudied dissolving open cluster candidates NGC 5385, NGC 2664 and Collinder 21. Our analysis stands on the discussion of star counts, photometry, radial velocity distribution, and proper motions available from the Tycho 2 catalogue. All the three aggregates clearly emerge from the mean Galactic field, but, regrettably, the close scrutiny of proper motions and radial velocities reveals that we are not facing any physical group. Instead, what we are looking at are just chance alignments of a few bright unrelated stars. Our analysis casts some doubt on the Bica et al. (2001) criterion to look for Possible Open Cluster Remnants. It seems mandatory to define a better criterion to adopt for further investigations.