Issue |
Astron. Astrophys. Suppl. Ser.
Volume 143, Number 3, May I 2000
|
|
---|---|---|
Page(s) | 409 - 420 | |
DOI | https://doi.org/10.1051/aas:2000187 | |
Published online | 15 May 2000 |
CCD photometry and proper motions of late–type stars in the young open cluster Stock 2*
1
Armagh Observatory, College Hill, Armagh BT61 9DG, N. Ireland e-mail: ath@star.arm.ac.uk
2
Department of Pure and Applied Physics, The Queen's University of Belfast, Belfast BT7 1NN, N. Ireland
3
Department of Physics and Astronomy, Michigan State University, E. Lansing, Michigan 48824, U.S.A.
Send offprint request to: A. Theissen
Received:
8
December
1998
Accepted:
8
February
2000
We present the results of the first CCD BVRI photometric
and proper motion study of late-type stars
in the young open cluster Stock 2.
Twenty–one fields of approximately size
have been observed photometrically, from which we have identified 118
candidate members based on their positions on colour–magnitude diagrams
relative to
theoretical isochrones.
From a comparison of the known star density of the
Pleiades, we estimate the contamination of this selection
process due to background
stars to be as large as
.
However, only 22 of those 118 candidate members
have proper motions consistent with
membership,
suggesting that the contamination is of the order of
.
Additional candidate members were found by means of a proper motion analysis of
Schmidt plate material for a
field containing the cluster.
The cluster proper motion allows us to separate members
from background and foreground stars.
We have found 634 stars
with a membership probability
down to a limiting magnitude of
, corresponding to late–M dwarfs at the distance
of Stock 2.
Key words: stars: evolution / stars: late-type / open clusters: individual; stock 2
© European Southern Observatory (ESO), 2000