Astron. J., 133, 889-905 (2007/March-0)
New distant companions to known nearby stars. II. Faint companions of Hipparcos stars and the frequency of wide binary systems.
LEPINE S. and BONGIORNO B.
Abstract (from CDS):
We perform a search for faint, common proper motion companions of Hipparcos stars using the recently published Lépine-Shara Proper Motion-North catalog of stars with proper motion µ>0.15''/yr. Our survey uncovers a total of 521 systems with angular separations 3''<Δθ<1500'', with 15 triples and 1 quadruple. Our new list of wide systems with Hipparcos primaries includes 130 systems identified here for the first time, including 44 in which the secondary star has V>15.0. Our census is statistically complete for secondaries with angular separations 20''<Δθ<300'' and apparent magnitudes V<19.0. Overall, we find that at least 9.5% of nearby (d<100 pc) Hipparcos stars have distant stellar companions with projected orbital separations s>1000 AU. We observe that the distribution in orbital separations is consistent with Öpik's law, f(s)ds∼s–1ds, only up to a separation s~4000 AU, beyond which it follows a more steeply decreasing power law f(s)ds∼s–lds with l=1.6±0.1. We also find that the luminosity function of the secondaries is significantly different from that of the single stars' field population, showing a relative deficiency in low-luminosity (8<MV<14) objects. The observed trends suggest either a formation mechanism biased against low-mass companions, or a disruption over time of systems with low gravitational binding energy.
Astrometry - Stars: Binaries: General - Galaxy: Kinematics and Dynamics - Galaxy: Solar Neighborhood
VizieR on-line data:
<Available at CDS (J/AJ/133/889): table1.dat table2.dat table3.dat>
Par. 4.2 : HIP 64522 is not HD 115061, it is HD 115136.
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