A&A Supplement Series, Vol. 126, December I 1997, 357-364
Received February 23, 1996; accepted March 20, 1997
W.R.J. Rolleston - P.B. Byrne
Send offprint request: W.R.J. Rolleston
Armagh Observatory, College Hill, Armagh BT61 9DG, N. Ireland
New 4-colour 
CCD photometry to a limiting magnitude of
is presented for 1428 objects observed towards the direction
of the young, open cluster IC 2391. We observed 36 (
) fields
within 17 arcmin of the nominal cluster core. By fitting the theoretical
isochrones of D'Antona & Mazzitelli (1994) to a combination of
colour-magnitude and colour-colour diagrams, we have identified 17 stars
as probable cluster members with a further 85 stars as possible members.
The brightness distribution of low-mass members is compared with the
luminosity function observed for the Pleiades and we estimate that the
contamination due to background giants should be small.
keywords: stars: evolution -- stars: late-type -- open clusters: individual: IC 2391