On the luminosity ratio of pre-main sequence binaries
O. Malkov 1,
A. Piskunov 1 and
H. Zinnecker 2
Received 30 March 1998 / Accepted 16 April 1998
Assuming random pairing of single stars from the same fundamental IMF as a good scenario for pre-main sequence binary formation, we show how to derive the mass ratio distribution and the fundamental IMF from the observational luminosity ratio distribution, taking into account pre-main sequence evolution. We also determine how the detectability of a brown dwarf as a companion relates to its own mass, the mass of the primary, and the age of the system. Our calculations suggest that for a particular mass of a brown dwarf companion, there is a "best age" for detection, namely when the brown dwarf is in its deuterium burning phase. Clusters with ages to years would be most favorable to catch brown dwarfs at their "best age".
Key words: binaries: visual stars: pre-main-sequence stars: low-mass, brown dwarfs
Send offprint requests to: H. Zinnecker
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© European Southern Observatory (ESO) 1998
Online publication: September 14, 1998