Premiss: I'm not sure if this topic may match with subforum theme. I hope so because it is about world-building, though in alternative universe, but using same notable stars we know.
All the things I'm going to write here refer to a storyline a deviantArtist (nick)named "
Gorgonbreath" is writing and drawing. She is developing a science fiction taking place on a post-apocalyptic Earth, dwelled by drawing swanky, coloured and eerie original characters, mostly new species (or even genera) of
Homo sapiens.
We are currently working together on a speculative project involving the fiction of her.
She writes stories and situations and draws characters too.
I'm building up a scientific fictional background. And sometimes I do fan service at my website
Pratically I offer scientific consultation *lol*
Anyway her gallery is viewable here:
http://gorgonbreath.deviantart.comDystopia is the name of the fiction.
It takes place on an alternative Earth (to who knows Turtledove's novels has already got what I mean) and alternative Solar System. Apparently nothing differs from our Universe, even life has developed in specular way as in our Universe and so have Mankind and its History.
Everything alike our World
...but here difference is...In Dystopia Universe
star's life lasts half than expected time calculated in our Universe. If a Sun-like star, with 1 solar mass, takes 10 billion years before dying in Our Universe, in Dystopia's one takes only 5. And Sun is just 5 billion years old.
So the lifetime formula:
T
MS= 10
10[M/M
Sun][L
Sun/L]
Has to be divided by two.
So in Dystopia's Universe the Sun is close to death at current time.And so are other evolved stars in Solar Neighborhood
Especially the brightest ones alike
Sirius and
ProcyonHow does Dystopia Universe appears?The Sun has nearly exhausted hydrogen and is slowly beginning burning helium in its core. Mankind's technology has allowed to terraform and settle Mars and to emigrate toward younger Solar System analogues too. Indeed Earth's inhabitant have gone elsewhere, alike Epsilon Eridani, Epsilon Indi, Sigma Draconis et cetera, where stellar age is much younger and lively "blue dots" are present and may host newborn colonies.
On the other hand here how other nearby stars would appear (stars are scaled according to distance from Sun):
-
Alpha Centauri A-B: star A is slightly older than Sun, thus it's evolving off the Main Sequence alike Sun. Star B is less massive and will live more. But it won't be so lively due to evolving primary and increasing luminosity of its.
-
Tau Ceti: much older than Sun (7 billion years) it does appear as a K2III giant, with radius 15 times larger than Sun and nearly 80 times more luminous.
-
Sirius: the Dog's Star is already experiencing the second phase of red giant phase, appearing as a bright giant of spectal class K0II (luminosity=700 times that of Sun, 28 times brighter than before). White dwarf companion B is appear much dimmer than before and really hard to resolve.
-
Procyon: much more evolved than nearby Sirius, Procyon is passing through first stage of red giant star. Effective temperature significantly lowered (T=3,460 Kelvin from former 6,650) and radius enormously bloated (180 Solar radii) let the star being classified as Mira-type pulsating giant, with S6III spectral type. Luminosity nearly 4,200 higher than Sun. Moreover the star that now interacts with white dwarf companion as symbiotic binary (alike much further away stars R Aquarii, CH Cygni).
-
Delta Pavonis: passed through 1st red giant phase, the star is currently a K2III giant, 53 times more luminous than Sun.
-
Beta Hydri: 2nd stage Red giant star of Mira-type, with likely spectral type of M7III. Close to post-AGB phase.
-
Arcturus: the star lies in advanced phase of stellar death, appearing as briefly luminous post-AGB star, a hot but shrunken subdwarf star (sdB-type star) surrounded by hot gas forming a planetary nebula.
-
Altair: the prince star of Aquila constellation (the Eagle) appears as a cold but bright K5/7III giant star. Radius 55 times larger than Sun, 700 times more luminous.
-
Vega: it has evolved off the main sequence and appears alike a G5Ib pulsating Cepheid.
-
Pollux: it appears as a post-AGB giant with subsequent dim planetary nebula. Degenerate star appears as a hot B subdwarf (T=18,700 K). The planet has surived and lies nearly at same orbital separation (roughly 1.6 AUs)
- Capella: a couple of white dwarfs orbiting around common orbital barycentre.
-
Aldebaran: it's nicknamed "Bullwinkle" by Earthlings because of its stellar remnant, a neutron star. The closest pulsar to Solar System.
-
Algol: evolving primary has "swallowed" secondary K2III-IV subgiant and interacts only with former tertiary (yet unevolved) component. Thus the Demon Star includes a F7Ib supergiant and a close-in A5-type main sequence star.
- Gacrux: another neutron star, with invisible companion, likely a white dwarf.
There would be more stars to list, but I would quit here.
Further thread bumps should display planets and other stuff.
It was funny to imagine how notable stars will appear in the future.
I am also developing stc and ssc files for fictional evolved systems.
It would be a curious extra as Celestia Add-on.
Feedback about models' feasibility is requested.
Thanks for the attention