The Astrology of Space - Matrix Software

The Astrology of Space
The Two Types of Intrinsic Variables:
Extrinsic Variables
Extrinsic are not “true” variable stars. Their variations
are not caused by something happening within them,
but by the intervention of some external action or by
changes in aspect, as when an ellipsoidal star
revolves or rotates. The eclipsing variables are
extrinsics that change brightness when two stars
eclipse one another, total or partially, and sometimes
stars appear to have variance due to obscuring matter
drifting in front of them. These often show physical
interaction with interstellar matter.
Intrinsic Variables
These are the true variable stars, for something within
them is happening to cause the variation in their
appearance. The rest of this article will describe some
of the basic attributes of the various major types of
intrinsic variable stars. Some intrinsic variables have
a more or less regular rhythm or period and are
termed Periodic Variables, while others are only
periodic in a rough fashion and ire termed Semiregular
or Cyclic Variables.
These semi-regular variables may be seen to
dissolve, in a step-by-step manner, into those stars
whose variations show no obvious pattern, the
Irregular Variables. The most spectacular of all the
variables are the Novae, Supernovae, and other
Cataclysmic or Exploding Variables.
Periodic Variables
The periodic variables are giant and super-giant stars
with periodic variations ranging from an hour or so to
three years in length. In spectral class, the stars
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