Very low-mass stars and brown dwarfs of the young open cluster IC 2391

We have identified a large sample of probable low-mass members of the young open cluster IC 2391 based on optical (VRIZ) and infrared photometry. Our sample includes 50 probable members (JHK(s)) and 82 possible members, both very low-mass stars and brown dwarfs. We also provide accurate positions fo r these stars and brown dwarf candidates derived from red UK Schmidt plates measured using the microdensitometer SuperCOSMOS. Assuming an age of 53 My r, we estimate that we have reached a mass of 0.025 M-., if the identified objects are indeed members of IC 2391.