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2009MNRAS.394.1075H - Mon. Not. R. Astron. Soc., 394, 1075-1084 (2009/April-1)
Local effects in astrometric binary orbits: perspective transformation and light-travel time.
HALBWACHS J.-L.
Abstract (from CDS):
It is derived from simulations that, at a distance of 5pc, and assuming velocities typical of Population I stars, the position of the right ascending node could be derived for a few simulated unresolved binaries when the astrometric measurements have errors around 1µas. For the resolved brown dwarf binary 2MASSJ07464256+2000321, it appears that ignoring the LP effect would result in underestimating the masses of the components by 14 per cent of the errors as soon as the astrometric errors are around 20µas for each measurement. However, a `degenerate LP solution', taking into account the variation of the semimajor axis when the distance is varying, should provide reliable masses when the measurement errors are larger than 1 or 2µas. A few binaries in the Gaia program could deserve a degenerate LP solution, whereas a complete LP+LTT solution could be justified for resolved binaries observed with Space Interferometry Mission (SIM).
Abstract Copyright: © 2009 The Author. Journal compilation © 2009 RAS
Journal keyword(s): methods: analytical - astrometry - binaries: general - stars: fundamental parameters - stars: individual: 2MASSJ07464256+2000321
Simbad objects: 1
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