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A catalogue of young runaway Hipparcos stars within 3kpc from the Sun
Astrophysics of Galaxies · Submitted 28 Jul 2010
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim Thus, after subtraction of those 20 per cent, the runaway frequency among young stars is about 27 per cent.
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The abstract, sentence by sentence
Traditionally runaway stars are O and B type stars with large peculiar velocities.We want to extend this definition to young stars (up to ~50 Myr) of any spectral type and identify those present in the Hipparcos catalogue applying different selection criteria such as peculiar space velocities or peculiar one-dimensional velocities. Runaway stars are important to study the evolution of multiple star systems or star clusters as well as to identify origins of neutron stars. We compile distances, proper motions, spectral types, luminosity classes, V magnitudes and B-V colours and utilise evolutionary models from different authors to obtain star ages and study a sample of 7663 young Hipparcos stars within 3 kpc from the Sun. Radial velocities are obtained from the literature. We investigate the distributions of the peculiar spatial velocity, the peculiar radial velocity as well as the peculiar tangential velocity and its one-dimensional components and obtain runaway star probabilities for each star in the sample. In addition, we look for stars that are situated outside any OB association or OB cluster and the Galactic plane as well as stars of which the velocity vector points away from the median velocity vector of neighbouring stars or the surrounding local OB association/ cluster although the absolute velocity might be small. We find a total of 2547 runaway star candidates (with a contamination of normal Population I stars of 20 per cent at most). Thus, after subtraction of those 20 per cent, the runaway frequency among young stars is about 27 per cent. We compile a catalogue of runaway stars which will be available via VizieR.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | Traditionally runaway stars are O and B type stars with large peculiar velocities.We want to extend this definition to young stars (up to ~50 Myr) of any spectral type and identify those present in the Hipparcos catalogue applying different selection criteria such as peculiar space velocities or peculiar one-dimensional velocities. | contribution 0.79 | 0.51 | 0.04 | asserted 0.98 |
| s1 | Runaway stars are important to study the evolution of multiple star systems or star clusters as well as to identify origins of neutron stars. | background 1.00 | 0.04 | 0.02 | asserted 1.00 |
| s2 | We compile distances, proper motions, spectral types, luminosity classes, V magnitudes and B-V colours and utilise evolutionary models from different authors to obtain star ages and study a sample of 7663 young Hipparcos stars within 3 kpc from the Sun. | method 0.96 | 0.96 | 0.03 | asserted 0.98 |
| s3 | Radial velocities are obtained from the literature. | method 1.00 | 0.26 | 0.01 | asserted 0.99 |
| s4 | We investigate the distributions of the peculiar spatial velocity, the peculiar radial velocity as well as the peculiar tangential velocity and its one-dimensional components and obtain runaway star probabilities for each star in the sample. | method 0.92 | 0.96 | 0.04 | asserted 0.99 |
| s5 | In addition, we look for stars that are situated outside any OB association or OB cluster and the Galactic plane as well as stars of which the velocity vector points away from the median velocity vector of neighbouring stars or the surrounding local OB association/ cluster although the absolute velocity might be small. | method 0.91 | 0.91 | 0.03 | asserted 0.76 |
| s6 | We find a total of 2547 runaway star candidates (with a contamination of normal Population I stars of 20 per cent at most). | result 1.00 | 0.96 | 0.49 | asserted 1.00 |
| s7 | Thus, after subtraction of those 20 per cent, the runaway frequency among young stars is about 27 per cent. | result 0.89 | 0.93 | 0.43 | asserted 0.89 |
| s8 | We compile a catalogue of runaway stars which will be available via VizieR. | contribution 0.93 | 0.90 | 0.06 | asserted 0.99 |
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Original abstract
Traditionally runaway stars are O and B type stars with large peculiar velocities.We want to extend this definition to young stars (up to ~50 Myr) of any spectral type and identify those present in the Hipparcos catalogue applying different selection criteria such as peculiar space velocities or peculiar one-dimensional velocities. Runaway stars are important to study the evolution of multiple star systems or star clusters as well as to identify origins of neutron stars. We compile distances, proper motions, spectral types, luminosity classes, V magnitudes and B-V colours and utilise evolutionary models from different authors to obtain star ages and study a sample of 7663 young Hipparcos stars within 3 kpc from the Sun. Radial velocities are obtained from the literature. We investigate the distributions of the peculiar spatial velocity, the peculiar radial velocity as well as the peculiar tangential velocity and its one-dimensional components and obtain runaway star probabilities for each star in the sample. In addition, we look for stars that are situated outside any OB association or OB cluster and the Galactic plane as well as stars of which the velocity vector points away from the median velocity vector of neighbouring stars or the surrounding local OB association/ cluster although the absolute velocity might be small. We find a total of 2547 runaway star candidates (with a contamination of normal Population I stars of 20 per cent at most). Thus, after subtraction of those 20 per cent, the runaway frequency among young stars is about 27 per cent. We compile a catalogue of runaway stars which will be available via VizieR.
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$η$ UMa HD 120315 1.86 B3V 31.87 10 A/B early M 1,2,3 $α$ Cep HIP 105199 2.46 A8Vn 15.04 900 B mid M 4, 5, 2, 6 $ϵ$ UMa HD 112185 1.77 A1III-IVpkB9 25.31 530 B/C early M 4, 2, 7 $γ$ Boo HD 127762 3.02 A7IV+(n) 26.40 900 – – 8, 2, 9 a) Contrast limits are defined at an angular separation of 06. b) References are: 1) [ref] , 2) [ref] , 3) [ref] , 4) [ref] , 5) [ref] , 6) [ref] , 7) [ref] , 8) [ref] , and 9) [ref] .
SCExAO/CHARIS High-Contrast Pre-Launch Vetting of Roman Coronagraph Technology Demonstration PSF Reference Stars · Introduction · 0.89
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