VERY WIDE BINARIES AND OTHER COMOVING STELLAR COMPANIONS: A BAYESIAN ANALYSIS OF THE HIPPARCOS CATALOGUE

By Edward Shaya, R. Olling. 2010

286 citations recorded by the source corpus.

We develop Bayesian statistical methods for discovering and assigning probabilities to non-random (e.g., physical) stellar companions. These companions are either presently bound or were previously bound. The probabilities depend on similarities in corrected proper motion parallel and perpendicular to the brighter component's motion, parallax, and the local phase-space density of field stars. Control experiments are conducted to understand the behavior of false positives. The technique is applied to the Hipparcos Catalogue within 100 pc. This is the first all-sky survey to locate escaped companions still drifting along with each other. In the <100 pc distance range, ∼220 high probability companions with separations between 0.01 and 1 pc are found. The first evidence for a population (∼300) of companions separated by 1–8 pc is found. We find these previously unnoticed naked-eye companions (both with V < 6th mag): Capella & 50 Per, δ Vel & HIP 43797, Alioth (ϵ UMa), Megrez (δ UMa) & Alcor, γ & τ Cen, ϕ Eri & η Hor, 62 & 63 Cnc, γ & τ Per, ζ & δ Hya, β01, β02 & β03 Tuc, N Vel & HIP 47479, HIP 98174 & HIP 97646, and s Eri & HIP 14913. High probability fainter companions (>6th mag) of primaries with V < 4 are found for: Fomalhaut (α PsA), γ UMa, α Lib, Alvahet (ι Cephi), δ Ara, β Ser, ι Peg, β Pic, κ Phe, and γ Tuc.

Subfields: Astronomy and Astrophysics, Computational Mechanics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/bba7536e1fd5bbecabe261e67eb455655ff4e14e

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Citations in the corpus

Stellar Multiplicity (2013, background): “For solar-type and intermediate-mass stars stars, systems with separation out to several pc have been identified (e.g., Caballero 2009, 2010, Shaya & Olling 2011).”
FROM BINARIES TO MULTIPLES. I. DATA ON F AND G DWARFS WITHIN 67 pc OF THE SUN (2014, methodology): “CPM pairs wider than 30′′ are also found in the WDS or by matching the Hipparcos stars in PM and parallax (e.g. Shaya & Olling 2011).”
Multiplicity among Solar-type Stars (2017, background): “This also implies that HR 3570 is probably not a very wide companion of δVel, as suggested by Shaya & Olling (2011).”
EXTRACTING RADIAL VELOCITIES OF A- AND B-TYPE STARS FROM ECHELLE SPECTROGRAPH CALIBRATION SPECTRA (2015, background): “…7, van Leeuwen (2007)’s measured parallax of 21.03 mas, and the separations of the previously measured companions (van de Kamp & Vyssotsky 1929; Shaya & Olling 2011; De Rosa et al. 2014), and our new value of d(RV )dt = 0.96 km/sec/year, we find that if the RV trend we observe was caused by…”
WIDE COMPANIONS TO HIPPARCOS STARS WITHIN 67 pc OF THE SUN (2012, background): “Shaya & Olling (2011) found pairs with projected separations of few pc in theHipparcos catalog, many of which belong to known moving groups.”