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Autor:
Porter, John M., Hazelton, Joshua P.
Publikováno v:
In Advances in Surgery September 2023 57(1):257-266
Autor:
Porter, John M., Townsend, R. H. D.
Publikováno v:
Astrophys.J.623:L129-L132,2005
Recent observations of blue stragglers by De Marco et al. (2004) have revealed continuum deficits on the blue side of the Balmer discontinuity, leading these authors to infer the presence of discs around the stars. This intriguing possibility may thr
Externí odkaz:
http://arxiv.org/abs/astro-ph/0503437
Spectroastrometry is a technique which has the potential to resolve flux distributions on scales of milliarcseconds. In this study, we examine the application of spectroastrometry to binary point sources which are spatially unresolved due to the obse
Externí odkaz:
http://arxiv.org/abs/astro-ph/0408284
Autor:
Porter, John M.
Publikováno v:
Astron.Astrophys. 398 (2003) 631-638
Two models of the circumstellar disc around supergiant B[e] stars are discussed: an equatorial wind model produced by wind bi-stability, and a Keplerian viscous disc model. Both models are successful in providing a site for dust formation once they h
Externí odkaz:
http://arxiv.org/abs/astro-ph/0211449
We present infra-red (JHK) photometry of 52 isolated Be stars of spectral types O9--B9 and luminosity classes III--V. We describe a new method of reduction, enabling separation of interstellar reddening and circumstellar excess. Using this technique
Externí odkaz:
http://arxiv.org/abs/astro-ph/0101260
Autor:
Porter, John M.
It is assumed that Be star discs are driven by viscosity. Emission from disc models is calculated and is confronted with continuum observations. It is found that the outflowing viscous disc models can reproduce the observed IR continuum emission. How
Externí odkaz:
http://arxiv.org/abs/astro-ph/9906381
Autor:
Porter, John M., Skouza, B. A.
The flow generated by low-density radiatively driven winds which decouple their gas and radiation fields is discussed. In particular we concentrate on flow which is still bound to the star and can therefore reaccrete. The wind decelerates after decou
Externí odkaz:
http://arxiv.org/abs/astro-ph/9901120
Autor:
Porter, John M.
The effect of rotation of a star on the distribution of chemical species in radiative zones is discussed. Gravity darkening generates a large radiative force on heavy element ions which is directed toward the equatorial plane. Taking iron as an examp
Externí odkaz:
http://arxiv.org/abs/astro-ph/9810360
Autor:
Porter, John M.
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 d
Externí odkaz:
http://arxiv.org/abs/astro-ph/9805320