Milli-arcsecond Binaries

Details Milli-arcsecond Binaries Milli-arcsecond Binaries

2008-04-24

arxiv.org/abs/0804.4018v1

Astronomy and Astrophysics

Astrophysics

Proceedings ADELA 2008

Scientific paper

As part of an astrometric program, we have used the Very Long Baseline Array to measure the trigonometric parallax of several young stars in the Taurus and Ophiuchus star-forming regions with great accuracy. Additionally, we have obtained an unprecedented sample of high-resolution (~ 1 mas) images of several young stellar systems. These images revealed that about 70% of the stars in our sample are very tight binary stars (with separations of a few mas). Since it is highly unlikely that 70% of all stars are such tight binaries, we argue that selection effects are at work.

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