Non-monotonic spatial distribution of the interstellar dust in astrospheres: finite gyroradius effect

Abstract

High-resolution mid-infrared observations of astrospheres show that many of them have filamentary (cirrus-like) structure. Using numerical models of dust dynamics in astrospheres, we suggest that their filamentary structure might be related to specific spatial distribution of the interstellar dust around the stars, caused by a gyrorotation of charged dust grains in the interstellar magnetic filed. Our numerical model describes the dust dynamics in astrospheres under an influence of the Lorentz force and assumption of a constant dust charge. Calculations are performed for the dust grains with different sizes separately. It is shown that non-monotonic spatial dust distribution (viewed as filaments) appears for dust grains with the period of gyromotion comparable with the characteristic time scale of the dust motion in the astrosphere. Numerical modelling demonstrates that number of filaments depends on charge-to-mass ratio of dust.

arXiv comment14 pages, 13 figures, published in MNRAS

References in corpus (20)

• NLTE line formation of Fe in late-type stars II: 1D spectroscopic stellar parameters
• A far-infrared survey of bow shocks and detached shells around AGB stars and red supergiants
• Three-dimensional kinetic-MHD model of the global heliosphere with the heliopause-surface fitting
• Probing the mass-loss history of AGB and red supergiant stars from CO rotational line profiles I. Theoretical model -- Mass-loss history unravelled in VY CMa
• E-BOSS: an Extensive stellar BOw Shock Survey. I: Methods and First Catalogue
• Search for OB stars running away from young star clusters. I. NGC 6611
• The enigmatic nature of the circumstellar envelope and bow shock surrounding Betelgeuse as revealed by Herschel. I. Evidence of clumps, multiple arcs, and a linear bar-like structure
• A comprehensive search for stellar bowshock nebulae in the Milky Way: a catalog of 709 mid-infrared selected candidates
• Models of the circumstellar medium of evolving, massive runaway stars moving through the Galactic plane
• Very Large Interstellar Grains as Evidenced by the Mid-Infrared Extinction
• E-BOSS: An Extensive stellar BOw Shock Survey. II. Catalogue second release
• Search for OB stars running away from young star clusters. II. The NGC 6357 star-forming region
• The Astrosphere of the Asymptotic Giant Branch Star Irc+10216
• OB Stars & Stellar Bowshocks in Cygnus-X: A Novel Laboratory Estimating Stellar Mass Loss Rates
• Infrared Emission and the Destruction of Dust in HII regions
• Blowing in the wind: The dust wave surrounding $\sigma$ Ori AB
• Dust dynamics and evolution in expanding HII regions. I. Radiative drift of neutral and charged grains
• Detecting stellar-wind bubbles through infrared arcs in HII regions
• A Cometary Bow Shock and Mid-Infrared Emission Variations Revealed in Spitzer Observations of HD 34078 and IC 405
• 4U 1907+09: a HMXB running away from the Galactic plane

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• Non-thermal radio supernova remnants of exiled Wolf-Rayet stars
• Bow shocks, bow waves, and dust waves. II. Beyond the rip point
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• Infrared dust arcs around the stars: I. effect of the radiation pressure