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A&A Supplement Series, Vol. 126, December I 1997, 357-364

Received February 23, 1996; accepted March 20, 1997

Photometrically determined membership of the young, open cluster IC 2391

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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 tex2html_wrap_inline1191 CCD photometry to a limiting magnitude of tex2html_wrap_inline1193 is presented for 1428 objects observed towards the direction of the young, open cluster IC 2391. We observed 36 (tex2html_wrap_inline1195) 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

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