期刊
ASTRONOMY & ASTROPHYSICS
卷 395, 期 3, 页码 813-821出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20021262
关键词
open clusters and associations : individual : Alpha Per; stars : low-mass, brown dwarfs; stars : luminosity, mass functions
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 M-circle dot. We have used this list of members to derive the luminosity and mass functions of the substellar population of the cluster (alpha = 0.59 +/- 0.05, when expressed in the mass spectrum form phi proportional to M-alpha) and compared its slope to the value measure for the Pleiades. This comparison indicates that the two cluster mass functions are, indeed, very similar.
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