SIMBAD references

2004A&A...416..125D - Astronomy and Astrophysics, volume 416, 125-136 (2004/3-2)

Proper motion surveys of the young open clusters Alpha Persei and the Pleiades.


Abstract (from CDS):

In this paper we present surveys of two open clusters using photometry and accurate astrometry from the SuperCOSMOS microdensitometer. These use plates taken by the Palomar Oschin Schmidt Telescope giving a wide field (5° from the cluster centre in both cases), accurate positions and a long time baseline for the proper motions. Distribution functions are fitted to proper motion vector point diagrams yielding formal membership probabilities. Luminosity and mass functions are then produced along with a catalogue of high probability members. Background star contamination limited the depth of the study of Alpha Per to R=18. Due to this the mass function found for this cluster could only be fitted with a power law (ξ(m)=m–α) with α=0.86+0.14–0.19. However with the better seperation of the Pleiades' cluster proper motion from the field population results were obtained down to R=21. As the mass function produced for this cluster extends to lower masses it is possible to see the gradient becoming increasingly shallow. This mass function is well fitted by a log normal distribution.

Abstract Copyright:

Journal keyword(s): astrometry - stars: low mass, brown dwarfs - Galaxy: open clusters and associations: individual: Alpha Per, Pleiades

VizieR on-line data: <Available at CDS (J/A+A/416/125): tableb1.dat tableb2.dat tableb3.dat tableb4.dat>

Nomenclature: Table 1: Cl* Melotte 20 DH NNN (Nos 1-302). Table 3: Cl* Melotte 22 DH NNN (Nos 1-916).

Simbad objects: 1259

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