Pulsating Variable Stars

Stars have a vast array of types, luminosity, and characteristics that make each type of star unique in its own way. Whether the star is a brown dwarf, red giant, Mira, or symbiotic, these various types of stars each have their own characteristics that makes them unique. However, all of these stars are considered to be intrinsic stars meaning that variables about the stars change over time, as some may get brighter, dimmer, or even change size. Intrinsic variable stars can be subcategorized into two groups eruptive, which is what most of the stars that I mentioned are, or pulsating. Pulsating variable stars are an interesting type of star that varies over the course of its set life time. Pulsating variable stars change over the course of their lifetime, as sometimes their changes are short term and while some may even be permanent. The types of things that change on pulsating variable stars are usually its temperature and luminosity.

The pulsating variable stars consist of a bunch of various sub-star categories that are often times sought to be extremely rare. One specific type of variable star that is rare to come across is the Cepheid variable star. Cepheid variable stars are yellow super giants that are used in present day astronomy as well as historical astronomy. Yellow super giant are an exceptionally significant find and useful type of star to the study of astronomy because they allow scientists to measure galactic and extragalactic distances that generally would generally not be able to be measured if not for the yellow super giants. Another important and interesting type of variable star within the variable pulsating star category is the RR Lyrae, which is a type of star that only lasts for one day, but these types of stars are much more common, therefore, when attempting to distinguish the intergalactic distance between the earth or another object, these types of stars can be used as guide points to accumulate and comprehend the distance. Unfortunately, since these only last one day, and sometimes even less, these types of stars must be used under great pressure in fear that they will disappear at any given moment if not monitored correctly. The most common type of pulsating variable stars are long-term variable stars. These types of pulsating variable stars are known as red giants and super giants. These stars have a lifespan from anywhere between a couple of months to even possibly a year. These types of stars may start off extremely bright and then dissipate as time goes on, or perhaps start at very low luminosity and then increase. Sometimes these stars have been documented to fluctuate monthly, bouncing back from different luminosities each month.

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