14.0 Modeling The Spectral Types We begin modeling the various types of stars by spectral
class. In order to do this we need to compute the radii of of the planets, their sizes. We want to
do this according to the equation!
!
This holds for our planet and I found it as presented by Hindu astrologers of ancient Vedic
scriptures. In India they have noticed that the diameter of the Sun is about 108 times the
diameter of the Earth, and, that the average distance from the Sun to the Earth (the Earth
orbital radius) is about 108 solar diameters. 108 is considered sacred and dynamic to them and
the yogis. They noticed that!
Where is the diameter the Sun, is the diameter of the Earth, and is the diameter of the
Sun. We will find that interestingly, as the mass of the star goes up on the HR diagram, meaning
its luminosity goes up, and therefore the habitable zone goes further out, the increase in
habitable zone distance compensates for the being squared in such a way that the radius of
the planet remains about constant, which turns out to be around the radius of the Earth. This
equation does not necessarily hold for all planets, but it may be the case for optimally habitable
planets, which is what our theory is primarily dealing in so far, This may be because given the
Nature of chemical compounds and elements necessary for a solid terrestrial planet, the planet
has to be the right size and density to be stable, have water oceans, and have the right gravity to
hold in the right kind of atmosphere. We even suggest that the planet day length of 24 hours
(86,400 seconds) remains close to constant. For a planet of Earth size it may need the day
length for the right climate and seasons. It is not absurd to suggest, Mars is further than Earth
from the Sun, and even much smaller, and less dense than the Earth, but it has the same day
length of 24 hours. So, in our modeling we will include the day as more or less constant as well.
The pressure gradient of protoplanetary discs we know is always 2.0 to 2.5 in stable planetary
systems. For our Sun we are quite sure it is 2.5, which is steep. The general trend is that it is
lowest for the more massive stars (2.2-2.3) for say F stars, and increases as we go down, but
starts to decrease again as we reach K and M stars. This may be because the HR diagram is not
linear, but an S-shaped curve. However, any of the stars can have a value for p anywhere in the
range from 2.0-2.5 depending on the initial gas cloud compositions, mass, and angular
momentum from which the protoplanetary disc formed in its collapse. Our values for the
masses, the radii, and luminosities of the star according to spectral class (the color of the star,
blue, yellow, orange, or red) are refined values. The S-shaped curve has a thickness, and the
values we have are the average values of the stars for each spectral class has have been measured
in sky surveys. We also use
in all of the computations (1.8) and not