Treana System

The Treana System is a high-mass close trinary system in the Flower Galaxy, composed of two massive Wolf-Rayet stars and an O-type star. The system has existed for less than two million years, and is located at the dead center of the Treana Molecular Cloud Complex, in the Sapphire Cluster.

Properties

This ternary system is probably the most massive and energetic systems in the galaxy, residing in the Treana Molecular Cloud Complex and fueling its star formation. Treana contains the second most massive star in the entire galaxy (Treana Aa), at a whopping 148.2 solar masses.

The extreme luminosity of this star system made the Providence Union build several SICTIRIAD stations surrounding the system shortly before its demise. Treana itself was not affected by the burst of Black Hole Bombs, due to its population being relatively low. The Federation of the Treana Nebula has been at work repairing these stations, and Treana will likely soon become a hub of commerce.

An extremely large Dyson Sphere surrounds this star system, and is constantly under maintenance from the deadly solar winds emanating from the three stars. Owing to the constant repairing, it is not as safe to be around these spheres and they are home to obscure gang-esque groups which have caused repeated instability around the area. Fortunately, nothing like this has been found in or near the SICTIRIAD stations.

Orbital Characteristics

The Treana System is noteworthy as it is extremely tightly bound for a system with stars this massive. As a result, Treana Aa and Ab have a separation of only four Treana Aa radii, and the pair orbits around their barycenter around every 6.85 earth days. The separation between Treana Aa-Ab and B is only 3.5 AU, and because of the large masses involved, the system only takes 143 days to complete an orbit.

Physical characteristics

Out of the three, Treana B, also nicknamed Enirepa, is the most massive. It has a mass of almost 150 solar masses, astonishingly large for any kind of star. It is in fact the second most massive star in the entire Flower Galaxy. Because of this, it and Treana Aa are already wolf-rayet stars. Treana B's initial mass was around 190 solar masses, and it is also the largest of the three stars, being around 20 times the radius of the sun.

Treana Aa, also dubbed Traiteni, is the second most massive (~76.2 solar masses) and is also a Wolf-Rayet star. Its initial mass was around 100 solar masses.

Treana Ab, known as Uresie, is the least massive star and is what is known as a Slash Star, a rare form of "main-sequence" star which is about to become a Wolf-Rayet, and is around 49.4 solar masses in mass. It is the smallest of the three stars.

History

The Treana system only formed 1.9 million years ago, and is a very young star system. The Treanan stars formed much farther apart than they currently are, being formed in two separate systems, (3 light years apart when they first formed) one containing the single Treana B (Enirepa) and the other, the close Treana A binary. The reason that they are now a binary is that both Treana systems (A&B) formed in a dense star cluster, and stellar interactions were common. So Treana A managed to pull Treana B into a relatively distant orbit, both separated by around 620 AU. But, other stars were everywhere.

Around 61,000 years after this happened, a 26 solar masses late O-type star passed very close to the Treana system and took some of Treana A's velocity, leading to that star, now known as the hypervelocity star Eimvas, to be slingshotted out of Treana's home cluster and into interstellar space at a high velocity. Treana A and B were now separated by just 27 AU.

At this point, the stars were just 310000 years old, all very young O-stars at the time (O2V, O3V and O4V) which were still burning hydrogen in their cores. However, a significant amount of nitrogen was quickly accumulating in the envelope of Treana B (The most massive of the three), and due to convection, the ionised nitrogen rose up to the surface, leading to a f in its spectral type. The powerful solar winds of the three stars also were slowing down their speeds and consequently shrinking their orbits. Everything pretty much continued evolving for the next few hundred thousand years.

Around 900,000 years ago, Treana B expanded and cooled, turning into a Luminous Blue Variable, albeit quite a hot one (around 35000 K) As soon as it did so, its stellar wind increased 100-fold, quickly withering the Treanan trajectories until the stars were just 1.8 AU apart, a drastic change. During this, Treana B also released a huge outburst (~10 solar masses) which turned into a bubble nebula surrounding the system and later ionised by the Treanan stars' powerful solar winds.