Unresolved Binaries and the Initial Mass Function |
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Authors: | Oleg Malkov |
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Institution: | (1) Institute of Astronomy, Pyatnitskaya 48, Moscow, 109017, Russia |
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Abstract: | In the area of binary stars the important contribution of GAIA will be towards statistical studies of the binary star distribution
functions. On the other hand, from the GAIA observations, more than 10 000 masses accurate to 1% can be expected. This improves
accuracy of the stellar initial mass function (IMF) still poorly known, particularly for the low-mass stars. A goal of the
present study is to simulate a solar vicinity model with 100% binaries for predicting observational distributions. Under the
assumption that star formation rate is constant, a random pairing of objects drawn from a pre-assumed single star power-law
IMF is generated. Stellar evolution and selection effects are taken into account. Orbital parameters are assumed to be spread
according to the common distributions. It is shown that under given assumptions the power-law IMF does lead to quasi-lognormal
turnovers for the resulting observational mass function. The described model can be used to estimate, under reasonable assumptions
on the IMF shape, the number of binaries of the different types that can be observed with GAIA.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | |
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