Hydrogen burning in chlorine produces a flame and in the process emits gaseous hydrogen chloride ( HCl ) as the combustion product.
12.
During core hydrogen burning, the helium fraction in the core increases and according to the virial theorem the core pressure and temperature will increase.
13.
This causes it to increase in temperature and hydrogen fuses in a shell outside the core, which provides more energy than core hydrogen burning.
14.
As a result of their hydrogen-rich envelopes, residual hydrogen burning via the CNO cycle may keep these white dwarfs hot on a long timescale.
15.
The reactive core zone of " hydrogen burning ", where hydrogen is converted into helium, is starting to surround an inner core of " helium ash ".
16.
:: : : I suspect that the flame is indeed hydrogen burning in oxygen ( possibly with traces of sodium from the salt making for a pretty colour ).
17.
Gradually, the hydrogen burning in the shell around the solar core will increase the mass of the core until it reaches about 45 % of the present solar mass.
18.
As core hydrogen burning progresses, a very massive star would slowly expand and become more luminous, becoming a blue hypergiant and eventually an LBV while still fusing hydrogen in the core.
19.
At an estimated age of nearly 20 million years, this star is around 55 65 % of the way through its evolutionary period on the main sequence of core hydrogen burning stars.
20.
In massive stars, the core is already large enough at the onset of the hydrogen burning shell that helium ignition will occur before electron degeneracy pressure has a chance to become prevalent.
