Hadra

Hadra is a late WN-type wolf-rayet star in the Kerillis Nebula. It is very bright as far as wolf-rayet stars go, due to being very large compared to most. It is also, interestingly, a single star, which is not particularly common for wolf-rayets in The Silky Way.
== Discovery ==
Hadra was discovered shortly after the invention of the telescope on Teralla, and given the name of Hadra, meaning "small companion", due to the fact that it was very close to the much brighter Kerillis in the sky. It is also cataloged as MIP-14391 or SW-WR51.
== Properties ==
Hadra is a very hot star compared to other stars, but it is actually rather cold, compared to other Wolf-Rayet stars, being a WN9ha. It has an average temperature of 32,000 Kelvin, so it has a visual luminosity of 79,700 times the sun. 
== History ==
Hadra was originally an O-type main sequence star of roughly 150 solar masses, and stayed this way for the majority of its extremely short life. Four million years into its lifetime, it expanded into a yellow hypergiant, pushing outwards or absorbing the majority of its already pretty ragged disk. 
A few thousand years later, Hadra collapsed into a Luminous Blue Variable, a rare form of blue supergiant/hypergiant that can shrink or expand by a factor of four in the span of years, and can sometimes erupt, losing a vast amount of mass in the process (Usually on the order of 5 solar masses per eruption), and sometimes creating a nebula in the process. A mere 30,000 years after leaving the main sequence, Hadra became a Wolf-Rayet star, leaving us where we are today.
=== Predicted future ===
Hadra doesn't have long to live. It is set to slowly increase in temperature, and move onto the Wolf-Rayet Carbon spectrum, and potentially the exceedingly rare oxygen spectrum. In about two hundred thousand years, at only 110 solar masses remaining, it will go supernova, exploding in a powerful gamma-ray burst. Nothing will remain.
== Surroundings ==
Hadra has a dust disk left over from its protoplanetary disk days, and a shell of young comets. Its oort cloud is less massive than most oort clouds, due to Hadra's astonishingly high stellar wind.
=== Probes and such ===
Relatively recently, a series of small probes were sent across the vast gap of uncolonized space to explore the Parallelogram Cluster. Some of them went to Hadra. 
=== Discoveries ===
When the probes arrived, they found that the disk had a relatively large amount of rare elements in it, making a prime candidate for mining expeditions once the wave of colonization reaches the Kerillis Nebula. Category:Stars
Category:Kerillis Nebula
Category:Minmus' Articles