Solakku

Solakku

Solakku, viewed through a solar filter
Characteristics
Evolutionary stage	Main Sequence
Spectral type	kA5hA8mF4
B−V color index	0.27
Details
Mass	1.55 M☉
Radius	1.559 R☉
Luminosity	7.96 L☉
Temperature	7800 K
Metallicity [Fe/H]	0.178 dex
Age	2.6 billion years
Orbit
Mean distance from Milky Way core	8200 light-years
Galactic period	45 million years
Velocity	340 km/s about Galactic Center

Solakku is the star at the centre of the avali home system. It is chemically peculiar and roughly classifiable as an A-type main-sequence star. It orbits the galactic enter at a distance of 8200 light-years on average and is approximately 6.4 astronomical units (960,000,000 km) away from Avalon. This corresponds to about 53 light-minutes.

Solakku forms a binary solar system together with its red dwarf companion Crest. Alone, Solakku contains 91.29% of the total mass of this system and together with Crest, the two stars hold 99.77% of the total mass.

Like other main-sequence stars, Solakku produces energy through nuclear fusion of Hydrogen into Helium and emits most of this energy through light, in its case mostly visible light and infrared.

Composition

Solakku consists mainly of hydrogen and helium, though the composition is different between what is observable in the photosphere and what is present in the core. As it is already 77% through its total lifespan, Solakku’s core consists of 82% helium, with the remaining 18% being mostly hydrogen.

The measured photosphere composition is 78.3% hydrogen and 19.1% helium. Metals account for the remaining 2.6%, most notably 0.25% iron and traces of Calcium. This is an unusual high metallicity for an A-type star, making it an Am-type chemically peculiar star. This makes classification difficult. Visually, Solakku is an A8 star, but the calcium indicates A5 and the metallic lines F4, leading to its unusual spectral type kA5hA8mF4.

As elements heavier than hydrogen usually sink into the star over time due to gravity as the density of the core increases, it can generally be assumed that the metallicity of Solakku in its inner layers is even higher than what the photospheric composition would suggest.

Structure

Structurally, Solakku consist of several zones, separated by short transition layers. The main layers are the core, convective zone, radiative zone and atmosphere, which is itself split into the photosphere, chromosphere and corona.

Convective zone

Illustration of different stars’ internal structure based on mass. Solakku on the left has an inner convective zone and an outer radiative zone.

Solar radiation

TODO: section on solar radiation: what wavelengths are emitted, how much energy, how much arrives on Avalon

TODO: section on solar activity, mainly flares

Life phases

Formation

Solakku formed approximately 2.6 billion years ago through gravitational collapse of a molecular cloud, beginning its life cycle. This occurred most likely at the same time as Crest’s formation, as they are projected to have very similar ages. However, Crest does not share Solakku’s chemical peculiarities, so the two stars may have formed in different regions of their molecular cloud. Another theory posits that Crest was captured by Solakku and the overlapping ages are merely a coincidence.

Main Sequence

TODO: mention age and how far it is into its main sequence

Location

TODO: section on location and celestial neighbourhood

Solar system

TODO: section on planetary system with relevant links to individual bodies

TODO: embed relevant links to wikipedia articles in text