Physical Properties of Stars and Stellar Dynamics

Authors: Yuri Heymann

The present study is an investigation of stellar physics based on observables such as mass, luminosity, radius, and photosphere temperature. We collected a dataset of these characteristics for 360 stars, and diagramed the relationships between their characteristics and their type (white dwarf, red dwarf, main sequence star, giant, supergiant, hypergiant, Wolf-Rayet, carbon star, etc.). For stars dominated by radiation pressure in the photosphere which follow the Eddington luminosity, we computed the opacity and cross section to photon flux per hydrogen nuclei in the photosphere. We considered the Sun as an example of star dominated by gas pressure in the photosphere, and estimated the density of the solar photosphere using limb darkening and assuming the adiabatic gradient of a monoatomic gas. We then estimated the cross section per hydrogen nuclei in the plasma of the solar photosphere, which we found to be about 2.66\e{-28} \, m^2, whereas the cross section of neutral hydrogen as given by the Bohr model is 8.82\e{-21} \, m^2. This result suggests that the electrons and protons in the plasma are virtually detached. Hence, a hydrogen plasma may be represented as a gas mixture of electrons and protons. If the stellar photosphere was made of large hydrogen atoms or ions such as the ones we find in gases, its surface would evaporate due to the high temperatures.

Comments: 15 Pages. Accepted for publication in Progress in Physics

Download: PDF

Submission history

[v1] 2016-12-26 11:48:47 (removed)
[v2] 2017-01-14 04:18:08

Unique-IP document downloads: 45 times is a pre-print repository rather than a journal. Articles hosted may not yet have been verified by peer-review and should be treated as preliminary. In particular, anything that appears to include financial or legal advice or proposed medical treatments should be treated with due caution. will not be responsible for any consequences of actions that result from any form of use of any documents on this website.

Add your own feedback and questions here:
You are equally welcome to be positive or negative about any paper but please be polite. If you are being critical you must mention at least one specific error, otherwise your comment will be deleted as unhelpful.

comments powered by Disqus