Infrared dust arcs around the stars: I. effect of the radiation pressure
arXiv:1904.07760 · doi:10.1093/mnras/stz1105
Abstract
In this paper we consider the distribution of the interstellar dust in the vicinity of the star under an influence of the stellar gravitation and radiation pressure. This study is applicable to the stars with relatively weak stellar wind and strong radiation, when the stellar radiation swept out the interstellar dust much further from the star than the position of the bow shock created by an interaction of the stellar and interstellar plasma flows. In this case the number density of dust for a certain dust grains radius can be calculated analytically based on the classical `cold model'. The dust density distribution for the mixture of dust grains with different radii is calculated. We also calculated intensity maps of the thermal infrared emission at 24~m from dust due to heating by the stellar radiation. It is shown that the obtained maps of the infrared emission extremely depends on the model parameters: material of dust grains, dust size distribution assumed in the interstellar medium, the approach used to calculate the dust temperature. The bright distinct arc at the intensity maps is seen for graphite dust grains and almost disappears for silicates. Absolute values of intensity in the case of graphite are several order of magnitudes larger than for silicates due to more intensive heating of graphite. Possible application of the presented theory is proposed as an algorithm for analysis of the observational images of the infrared arc around the star.
16 pages, 9 figures; accepted for publication in Monthly Notices of the Royal Astronomical Society
References in corpus (13)
- 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
- A comprehensive search for stellar bowshock nebulae in the Milky Way: a catalog of 709 mid-infrared selected candidates
- Wind bubbles within H II regions around slowly moving stars
- Orbital and physical properties of the Ori Aa,Ab,B triple system
- Dust dynamics and evolution in expanding HII regions. I. Radiative drift of neutral and charged grains
- Porous dust grains in debris disks
- Modeling the Infrared Bow Shock at delta Velorum: Implications for Studies of Debris Disks and lambda Bootis Stars
- Radiation-pressure-driven dust waves inside bursting interstellar bubbles
- Modelling interstellar structures around Vela X-1
- An astrosphere around the blue supergiant kappa Cas: possible explanation of its filamentary structure
- Eyes in the sky: Interactions between AGB winds and the interstellar magnetic field
- Non-monotonic spatial distribution of the interstellar dust in astrospheres: finite gyroradius effect
- Dense molecular globulettes and the dust arc towards the runaway O star AE Aur (HD 34078)