A typical spectrum when first formed would be O2If and the star would be mostly or fully differentially rotating stars undergo such strong mixing that they remain chemically homogeneous during core hydrogen burning.
22.
If the star is big enough, this will generate enough temperature for helium fusion to occur, and the star will now have a helium burning core, with the hydrogen burning layer outside that.
23.
The presence of carbon in the exhaust from the ablative carbon-containing inner nozzle lining can be inferred by the yellow color of the engine exhaust, unlike the SSME's nearly-transparent flame of pure hydrogen burning.
24.
Subdwarf B ( sdB ) stars are in essence the cores of core-helium burning giants who have somehow lost most of their hydrogen envelopes, to the extent that there is no hydrogen burning shell.
25.
However it is still in a core hydrogen burning phase and hydrogen lines are also visible in the spectrum, in contrast to WN stars without hydrogen which are older, less massive, and less luminous.
26.
Normally this kind of AGB carbon star fuses hydrogen in a hydrogen burning shell, but in episodes separated by 10 4-10 5 years, the star transforms to burning helium in a shell, while the hydrogen fusion temporarily ceases.
27.
Because of this, if the orbit of HD 4747 B is inclined by less than 40? the mass of the object will be above the hydrogen burning limit at approximately that marks the transition between stars and brown dwarfs.
28.
In the core of a star, once hydrogen burning in nuclear fusion reactions stops, it becomes a collection of positively charged ions, largely helium and carbon nuclei, floating in a sea of electrons, which have been stripped from the nuclei.
29.
The most common red giants are stars on the red-giant branch ( RGB ) that are still asymptotic-giant-branch ( AGB ) stars with a helium burning shell outside a degenerate carbon oxygen core, and a hydrogen burning shell just beyond that.
30.
Hydrogen burning is an expression that astronomers sometimes use for the stellar process that results in the nuclear fusion of four protons to form a nucleus of helium-4 . ( This should not be confused with the combustion of hydrogen in an oxidizing atmosphere . ) There are two predominant processes by which stellar hydrogen burning occurs.
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