Photometrically determined membership of the young, open cluster IC 2391

Free access article

Issue		Astron. Astrophys. Suppl. Ser. Volume 126, Number 2, December_I 1997


Page(s)		357 - 364
DOI		http://dx.doi.org/10.1051/aas:1997270

DOI: 10.1051/aas:1997270

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

W.R.J. Rolleston - P.B. Byrne

Send offprint request: W.R.J. Rolleston
Armagh Observatory, College Hill, Armagh BT61 9DG, N. Ireland

Abstract:

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

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