منابع مشابه
On the warping of Be star discs
The theory of radiatively-induced warps in accretion discs is applied to the discs of Be stars. It is found that these discs may develop warps in their inner regions, although once the warp amplitude is large enough then the interaction between the disc and fast radiatively-driven wind will determine its evolution. The warping is shown to be more important for later than earlier B stars. Althou...
متن کاملOne-armed oscillations in Be star discs
Aims. In this paper we study the effect of the quadrupole-term in the gravitational potential of a rotationally deformed central Be star on one armed density waves in the circumstellar disc. The aim is to explain the observed long-term violet over red (V/R) intensity variations of the double peaked Balmer emission-lines, not only in cool Be star systems, but also in the hot systems like γ Cas. ...
متن کاملContinuum IR emission of Be star wind-compressed discs
A prescription for the density of a wind compressed disc (WCD) is given and the IRemissionof the disc is calculated. The prescription enables emission fromWCDs to be calculated simply without recourse to full 2 1 2 -dimensional (2 1 2 -D) modelling of rotating radiatively driven winds. It is shown that the standard WCD model is incapable of representing observed Be star discs. As a guide for fu...
متن کاملSpatially resolved star formation histories of nearby galaxies: evidence for episodic star formation in discs
Using long-slit spectroscopy from Moran et al. (2012) we constrain the radial dependence of the recent star formation histories of nearby galaxies with stellar masses greater than 1010M⊙. By fitting stellar population models to the combination of SSFR, D4000 and HγA, we show that the star formation histories of many disk galaxies cannot be accurately represented if their star formation rates de...
متن کاملStar formation in accretion discs : from the Galactic Center to Active Galactic Nuclei
Context. Keplerian accretion discs around massive black holes (MBHs) are gravitationally unstable beyond a few hundredths of parsec and should collapse to form stars. It was indeed shown recently that an accretion/star formation episode took place a few millions years ago in the Galactic Center (GC). This raises the question of how the disc can survive in AGN and quasars and continue to transpo...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1919
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/79.8.575