Sysgen Series*: Stars (day 2)

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Sysgen Series*: Stars (day 2)

Postby Cralis on Sun 09 Aug 2009 22:06

Editorial Note: Friday night I either went to bed too late, or consumed too much hard liquor...and I worked all day yesterday. Either way, day 2 disappeared into the ether. so this is yesterdays and I'll do today's in a bit tonight.

Today was busy, so this is a tiny bit late. But welcome to the second day of the complex sysgen topics. Today's topic will be about stars. We cover a couple details that won't seem to have any real purpose until we get into the last couple of topics...but I will give a small hint as to where we are going.

Another consideration is that I have reduced the data in this topic slightly. Rather than use the full stellar chart (OBAFGKM), I have reduced it to the same colors that are used in ULTRA STARFIRE. This will keep things a little simpler and the end result is nearly the same.

So on to Star Generation.

There are two important concepts here: Population Groups, and Spectral Grouping.

Spectral Grouping is where a poly-star system has similar classes of stars because they were 'born' at roughly the same time. It doesn't always happen, and at least one spectral group comes about a completely different way, but it appears through-out the universe.

There is an 70% chance (+10% per star over the third) that the poly-star system is spectrally grouped. If the poly-star system is spectrally grouped then roll on the following table:

SPECTRAL GROUP ROLL
01-30roll d10: (1-6) Blue Giant (7-0) White Star
31-60roll d10: (1-3) White Star (4-0) Yellow Star
61-80roll d10: (1-8) Yellow Star (9-0) Orange Star
81-99roll d10: (1-8) Red Star (9) Red Dwarf (0) White Dwarf
00(1st Star) Blue Giant, (2nd Star) Red Dwarf,
roll d10 for each additional star: (1-5) Blue Giant, (6-8) Red Dwarf, (9) Red Star, (0) White Dwarf


Populations have to do with the metallicity, with older stars having heavier metal elements. Populations were grouped by observation and have become a method of determining the rough age of a region of stars. And the age of a group of stars will roughly determine what types of stars you will find.

Why does this matter? Because in the sysgen topics about regions we will be limiting star types by populations. But more on that when the time comes.

There are two basic characteristics of a star we will be rolling to determine: the size class, and the spectral class. Roughly translated - how big and what color.

SIZE CLASSES
Special note about sizes: ULTRA STARFIRE "dwarf" is the Size-VI sub-dwarf, and "regular star" is Size-V dwarf and Size-IV sub-giant sizes. For ease of transition, I've broken the sizes into 4 categories for this: sub-dwarf, dwarf/sub-giant, giant, and super-giant. The complex sysgen has all of them separated out.

POPULATION I and II
01Sub-Dwarf (Size-VI)
02-50Dwarf and Sub-Giant (Size-IV and V)
51-95Giant (Size-II and III)
96-99Super-Giant (Size I and 0)
00Special


POPULATION III and IV
01-05Sub-Dwarf
06-75Dwarf/Sub-Giant
96-98Giant
99Super-Giant
00Special


GENERIC 'ALL POPULATIONS' I-IV
01Sub-Dwarf
02-70Dwarf/Sub-Giant
71-95Giant
96-99Super-Giant
00Special


Now that we know what size class the star is, we need to determine its spectral class. Spectral class is much more defined by the population then size, and different groups of populations produce slightly different results. This means that there are more charts for the distribution of spectral class then size class.

NOTE: These are highly stylized towards ULTRA. I know.

POP I
Size/ColorBlueWhiteYellowOrangeRedWhite Dwarf
Sub-Dwarf--01-9698-00------
Dwarf/Sub-Giant--01-9091-00------
Giant01-9091-00--------
Super-Giant01-7071-9091-00------


POP II
Size/ColorBlueWhiteYellowOrangeRedWhite Dwarf
Sub-Dwarf--01-7071-00------
Dwarf/Sub-Giant--01-7071-9091-00----
Giant01-4041-6061-8081-9091-00--
Super-Giant01-5061-9091-00------


POP III
Size/ColorBlueWhiteYellowOrangeRedWhite Dwarf
Sub-Dwarf--01-5051-00------
Dwarf/Sub-Giant--01-2526-9091-00----
Giant01-0203-4041-6061-8081-00--
Super-Giant----01-20--21-00--


POP IV
Size/ColorBlueWhiteYellowOrangeRedWhite Dwarf
Sub-Dwarf----01-1011-2031-9091-00
Dwarf/Sub-Giant----01-4041-6061-00--
Giant----01-2526-4041-00--
Super-Giant--------01-00--


NOTE: For populations that include multiple groups, I simply blended the charts. It would take too much space to do it here so I'm leaving it for you. For the generic "everything chart" I simply blended into a Pop I-II-III-IV chart.

If you look back at the size charts, you'll see "specials". For this chart I use a d100 to make certain types very rare.

SPECIAL STAR TYPES
001-200Odd Star (roll on a population table other than the current region's table)
201-400Pulsar
401-450Radio Pulsar (has radiation zone terrain)
451-700Brown Dwarf with d10 moons
401-800Neutron Star
801-850Infrared Giant
851-900Black Dwarf
901-999Super Nova Remnant: (1) Gravastar (blackhole), (2-6) Pulsar + emissions nebula, (7-0) Neutron star + nebula
000Gravastar (aka Blackhole)


STAR SIZES
ColorSub-dwarfDwarf/Sub-giantGiantSuper-giant
Blue30 LS72 LS96 LS140 LS
White4.5 LS12 LS60 LS360 LS
Yellow2 LS10 LS160 LS1200 LS
Orange0.5 LS0.5 LS300 LS3000 LS
Red0.5 LS100 LS720 LS6000 LS


White Dwarves: < 1 tH
Brown Dwarf: < 1 tH
Black Dwarf: < 1 tH
Neutron Star: < 1 tH
Infrared Giant: 15 + 1d10 LM
Pulsar: 2 tH (1/2 LS)
Radio Pulsar: same

NOTE: Another WP abnormality occurs here. Any WP that would normally occur INSIDE a star is instead pushed to the sH of its outer edge. Instead the WP will be 1d100 tH inside the edge of the star. Additional WP that end up in the same sH will use the ULTRA "multiple WP per hex" rules.

The next chart is for the next sysgen topic.

LUMINOSITY
ColorSub-dwarfDwarf/Sub-giantGiantSuper-giant
Blue430830180052000
White6.5113333000
Yellow0.61.31329000
Orange0.080.3925000
Red0.010.046.220000


White dwarf = 2/3 original luminosity
Black dwarf = 0
Infrared Giant = 25
Pulsars and Neutron stars are as per their original star

Ok, next we move to stellar disks. There is where we will handle the calculation of rocky, gas, and ice zones.
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Cralis
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