Motions of neutral hydrogen at high latitudes

Blaauw, Adriaan; Feješ, I.; Tolbert, C. R.; Hulsbosch, A. N. M.; Raimond, E.

doi:10.1017/s0074180900101068

Cited by 330 publications

(487 citation statements)

References 1 publication

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“…This assumption is consistent with both the observed birth locations of massive stars in a thin disk in the Galactic plane (e.g., Urquhart et al 2014), and more specifically the finding that metal abundances in the secondary in blackhole X-ray binaries is consistent with a thin-disk origin (e.g., González Hernández et al 2008). Population synthesis modeling can then be applied to include the contribution of Blaauw kicks (Blaauw 1961) from mass loss during the supernova and constrain the range of supernova-induced natal kicks required to preserve the binary with current orbital parameters.…”

Section: Introductionsupporting

confidence: 71%

Estimates of black hole natal kick velocities from observations of low-mass X-ray binaries

Mandel

2015

Mon. Not. R. Astron. Soc.

155

122

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The birth kicks of black holes, arising from asymmetric mass ejection or neutrino emission during core-collapse supernovae, are of great interest for both observationally constraining supernova models and population-synthesis studies of binary evolution. Recently, several efforts were undertaken to estimate black hole birth kicks from observations of black-hole low-mass X-ray binaries. We follow up on this work, specifically focussing on the highest estimated black-hole kick velocities. We find that existing observations do not require black hole birth kicks in excess of approximately 100 km/s, although higher kicks are not ruled out.

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Section: Introductionsupporting

confidence: 71%

Estimates of black hole natal kick velocities from observations of low-mass X-ray binaries

Mandel

2015

Mon. Not. R. Astron. Soc.

155

122

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“…There are two leading mechanisms by which massive stars can be ejected from their birthplaces; the binary supernova scenario where a massive binary system becomes unbound after a SN explosion (Blaauw 1961), and the dynamical ejection scenario where close encounters in a dense cluster can eject massive single or binary stars (Poveda, Ruiz & Allen 1967).…”

Section: Wr Stars At Large Distances From the Galactic Diskmentioning

confidence: 99%

Spatial distribution of Galactic Wolf–Rayet stars and implications for the global population

Rosslowe

Crowther

2015

Monthly Notices of the Royal Astronomical Society

123

143

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We construct revised near-infrared absolute magnitude calibrations for 126 Galactic Wolf-Rayet (WR) stars at known distances, based in part upon recent large scale spectroscopic surveys. Application to 246 WR stars located in the field, permits us to map their Galactic distribution. As anticipated, WR stars generally lie in the thin disk (∼40 pc half width at half maximum) between Galactocentric radii 3.5-10 kpc, in accordance with other star formation tracers. We highlight 12 WR stars located at vertical distances of 300 pc from the midplane. Analysis of the radial variation in WR subtypes exposes a ubiquitously higher N W C /N W N ratio than predicted by stellar evolutionary models accounting for stellar rotation. Models for non-rotating stars or accounting for close binary evolution are more consistent with observations. We consolidate information acquired about the known WR content of the Milky Way to build a simple model of the complete population. We derive observable quantities over a range of wavelengths, allowing us to estimate a total number of 1200 +300 −100 Galactic WR stars, implying an average duration of ∼ 0.25 Myr for the WR phase at the current Milky Way star formation rate. Of relevance to future spectroscopic surveys, we use this model WR population to predict follow-up spectroscopy to K S ≃ 13 mag will be necessary to identify 95% of Galactic WR stars. We anticipate that ESA's Gaia mission will make few additional WR star discoveries via low-resolution spectroscopy, though will significantly refine existing distance determinations. Appendix A provides a complete inventory of 322 Galactic WR stars discovered since the VIIth catalogue (313 including Annex), including a revised nomenclature scheme.

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“…The obtained space velocity of ≈ 30 km s −1 implies that κ Cas is a classical runaway star (e.g. Blaauw 1961). …”

Section: Observational Datamentioning

confidence: 82%

An astrosphere around the blue supergiant κ Cas: possible explanation of its filamentary structure

Katushkina

Alexashov

Gvaramadze

et al. 2017

Monthly Notices of the Royal Astronomical Society

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High-resolution mid-infrared observations carried out by the Spitzer Space Telescope allowed one to resolve the fine structure of many astrospheres. In particular, they showed that the astrosphere around the B0.7 Ia star κ Cas (HD 2905) has a clear-cut arc structure with numerous cirrus-like filaments beyond it. Previously, we suggested a physical mechanism for the formation of such filamentary structures. Namely, we showed theoretically that they might represent the non-monotonic spatial distribution of the interstellar dust in astrospheres (viewed as filaments) caused by interaction of the dust grains with the interstellar magnetic field disturbed in the astrosphere due to colliding of the stellar and interstellar winds. In this paper, we invoke this mechanism to explain the structure of the astrosphere around κ Cas. We performed 3D magnetohydrodynamic modelling of the astrosphere for realistic parameters of the stellar wind and space velocity. The dust dynamics and the density distribution in the astrosphere were calculated in the framework of a kinetic model. It is found that the model results with the classical MRN size distribution of dust in the interstellar medium do not match the observations, and that the observed filamentary structure of the astrosphere can be reproduced only if the dust is composed mainly of big (µm-sized) grains. Comparison of the model results with observations allowed us to estimate parameters (number density and magnetic field strength) of the surrounding interstellar medium.

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Motions of neutral hydrogen at high latitudes

Cited by 330 publications

References 1 publication

Estimates of black hole natal kick velocities from observations of low-mass X-ray binaries

Estimates of black hole natal kick velocities from observations of low-mass X-ray binaries

Spatial distribution of Galactic Wolf–Rayet stars and implications for the global population

An astrosphere around the blue supergiant κ Cas: possible explanation of its filamentary structure

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