## ONE/2 System Age And Abundance

STEP ONE: Determine the relative age of the system by rolling 1d10 and consult the chart, section of the primary star. This is especially important to main sequence F, G and K-class stars. From the relative age, get the absolute age listed in the chart and apply it to all the other stars in the system. (In other words, in a multiple-star system all are of the same age). Note the absolute age and round it off to the nearest Gy - it will become important later. (A giga-year (Gy) is 1,000,000,000 years.)

STEP TWO: Apply the percentile adjustments given from the chart - if any - to the luminosity of the star.

STEP THREE: Determine the Abundance of the system by rolling on 1.2.3.

Table 1.2.1 System Age

Note: nc = no change, Temp Mod = adjustment to temperature roll in section ONE/1

Ia, Ib, II, and III
 Find a main sequence star of the same mass. (This would be what the giant was before it became a giant). Use ... MS Age = 10 x M / L ... to determine age of main sequence star (in Gy). Then ... Giant Age = MS Age x 1.2
IV
 Find a main sequence star of the same mass. (This would be what the subgiant was before it became a subgiant). Use ... MS Age = 10 x M / L ... to determine age of main sequence star (in Gy). Then ... Subgiant Age = MS Age x 1.1
O0v - O9v
 Class O main sequence stars have very short lives. To determine the age (in Gy) use ... Age = 1d10 / 1000
B0v - B9v
 First use ... Max Age = 10 x M / L ... to determine the maximum age this star could be (in Gy). Then ... Age = Max Age x (1d10/10)
A0v - A4v
 1d10 Age Luminosity 1 0.1 Gy -20% 2 0.1 Gy -20% 3 0.2 Gy -10% 4 0.2 Gy -10% 5 0.3 Gy nc 6 0.3 Gy nc 7 0.4 Gy +10% 8 0.4 Gy +10% 9 0.5 Gy +20% 10 0.6 Gy +20%
A5v - A9v
 1d10 Age Luminosity 1 0.2 Gy -20% 2 0.4 Gy -20% 3 0.5 Gy -10% 4 0.6 Gy -10% 5 0.7 Gy nc 6 0.8 Gy nc 7 0.9 Gy +10% 8 1.0 Gy +10% 9 1.1 Gy +20% 10 1.2 Gy +20%
F0v - F4v
 1d10 Age Luminosity 1 0.3 Gy -40% 2 0.6 Gy -30% 3 1.0 Gy -20% 4 1.3 Gy -10% 5 1.6 Gy nc 6 2.0 Gy +10% 7 2.3 Gy +20% 8 2.6 Gy +30% 9 2.9 Gy +40% 10 3.2 Gy +50%
F5v - F9v
 1d10 Age Luminosity 1 0.5 Gy -40% 2 1.0 Gy -30% 3 1.5 Gy -20% 4 2.0 Gy -10% 5 2.5 Gy nc 6 3.0 Gy +10% 7 3.5 Gy +20% 8 4.0 Gy +30% 9 4.5 Gy +40% 10 5.0 Gy +50%
G0v - G4v
 1d10 Age Luminosity 1 1 Gy -40% 2 2 Gy -30% 3 3 Gy -20% 4 4 Gy -10% 5 5 Gy nc 6 6 Gy +10% 7 7 Gy +20% 8 8 Gy +30% 9 9 Gy +40% 10 10 Gy +50%
G5v - G9v
 1d10 Age Luminosity 1 1 Gy -40% 2 2 Gy -30% 3 3 Gy -20% 4 4 Gy -10% 5 5 Gy nc 6 6 Gy nc 7 7 Gy nc 8 8 Gy +10% 9 9 Gy +20% 10 10 Gy +30%
K0v - K4v
 1d10 Age Luminosity 1 1 Gy -20% 2 2 Gy -15% 3 3 Gy -10% 4 4 Gy -5% 5 5 Gy nc 6 6 Gy nc 7 7 Gy nc 8 8 Gy nc 9 9 Gy nc 10 10 Gy +5%
K5v - K9v
 1d10 Age Luminosity 1 1 Gy -10% 2 2 Gy -5% 3 3 Gy nc 4 4 Gy nc 5 5 Gy nc 6 6 Gy nc 7 7 Gy nc 8 8 Gy nc 9 9 Gy nc 10 10 Gy nc
M0v - M9v
 1d10 Age Luminosity 1 1 Gy -10% 2 2 Gy nc 3 3 Gy nc 4 4 Gy nc 5 5 Gy nc 6 6 Gy nc 7 7 Gy nc 8 8 Gy nc 9 9 Gy nc 10 10 Gy nc
VII ("White Dwarfs")
 1d10 Age Temp Mod 1 1 Gy -4 2 2 Gy -4 3 3 Gy -3 4 4 Gy -3 5 5 Gy -2 6 6 Gy -2 7 7 Gy -1 8 8 Gy -1 9 9 Gy 0 10 10 Gy 0
Brown Dwarfs
 1d10 Age Temp Mod 1 1 Gy 0 2 2 Gy +1 3 3 Gy +1 4 4 Gy +2 5 5 Gy +2 6 6 Gy +3 7 7 Gy +4 8 8 Gy +5 9 9 Gy +6 10 10 Gy +7

Table 1.2.2 Determine system abundance

 Roll 2d10 and add the system age (in Gy). Check on the chart and note the system modifier.Note: Halo stars are always depleted (-3). 2d10 Comment System Modifier -9 Exceptional +2 10-12 High +1 13-18 Normal 0 19-21 Poor -1 22+ Depleted -3