Volume 395, Number 3, December I 2002
|Page(s)||813 - 821|
|Section||Galactic structure, stellar clusters, and populations|
|Published online||18 November 2002|
A substellar mass function for Alpha Persei*
Laboratorio de Astrofísica Espacial y Física Fundamental, INTA, PO Box 50727, 28080 Madrid, Spain
2 Laboratoire d'Astrophysique, Observatoire de Grenoble, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France e-mail: email@example.com
3 IPAC, California Institute of Technology, Pasadena, CA 91125, USA e-mail: firstname.lastname@example.org
4 Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany e-mail: email@example.com,firstname.lastname@example.org
Corresponding author: D. Barrado y Navascués, email@example.com
Accepted: 28 August 2002
We present a deep, wide-field optical survey of the young stellar cluster Alpha Per, in which we have discovered a large population of candidate brown dwarfs. Subsequent infrared photometric follow-up shows that the majority of them are probable or possible members of the cluster, reaching to a minimum mass of 0.035 . We have used this list of members to derive the luminosity and mass functions of the substellar population of the cluster (, when expressed in the mass spectrum form ) and compared its slope to the value measure for the Pleiades. This comparison indicates that the two cluster mass functions are, indeed, very similar.
Key words: open clusters and associations: individual: Alpha Per / stars: low-mass, brown dwarfs / stars: luminosity, mass functions
© ESO, 2002
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