A variable star is a star whose brightness as seen from Earth that fluctuates.
Leon Campbell has written: 'The story of variable stars' -- subject(s): Stars, Variable, Variable stars
W. Strohmeier has written: 'Variable stars' -- subject(s): Variable stars
stars shining stars shining
It is a variable fraction.
You cannot.
Some aspect is variable, usually their luminosity.
No, it is a continuous process but not a continuous variable. The magnitude of star-shine, across all stars is a continuous variable. The magnitude of a star's shine over time is a continuous variable.
RR Lyrae stars. (Sometimes these stars are classed as a type of "Cepheid variable", but they are usually considered as a separate star type.)
Distance.
I would have to say so, since there are fixed units assigned (stars and half stars) and a limited number of responses possible. If you could give any amount of stars ( like 2.923 stars) then it would not be a discrete variable.
A variable star is a star whose brightness as seen from Earth that fluctuates.
Sidney Dean Townley has written: 'Orbit of Psyche' 'Harvard catalogue of long period variable stars' -- subject(s): Variable stars