<P> Classical nova eruptions are the most common type of nova . They are likely created in a close binary star system consisting of a white dwarf and either a main sequence , sub-giant , or red giant star . When the orbital period falls in the range of several days to one day , the white dwarf is close enough to its companion star to start drawing accreted matter onto the surface of the white dwarf , which creates a dense but shallow atmosphere . This atmosphere is mostly hydrogen and is thermally heated by the hot white dwarf , which eventually reaches a critical temperature causing rapid runaway ignition by fusion . </P>
<P> Classical nova eruptions are the most common type of nova . They are likely created in a close binary star system consisting of a white dwarf and either a main sequence , sub-giant , or red giant star . When the orbital period falls in the range of several days to one day , the white dwarf is close enough to its companion star to start drawing accreted matter onto the surface of the white dwarf , which creates a dense but shallow atmosphere . This atmosphere is mostly hydrogen and is thermally heated by the hot white dwarf , which eventually reaches a critical temperature causing rapid runaway ignition by fusion . </P>
where does the hydrogen fuel come from to cause a white dwarf to nova or supernova
where does the hydrogen fuel come from to cause a white dwarf to nova or supernova
This atmosphere
This atmosphere