Primordial System Age Question (WBH)

[Derpious]

Hello! I had taken a hiatus from playing around with The World Builder's Handbook; but I am back at it. I enjoy playing with it even though I have little to no likelyhood of ever using what I create

Anyway, I'm detailing random star systems as a hobby project and I've run into a bit of an issue or question mark regarding Primordial Star Systems.

So I have a system with a primary star of type O6 V. Reading about O-Type stars reveals that they automatically count as Primordial Star Systems. Then, when I got to the part where I detail the age of the star I ran into a bit of confusion.
The special rules for Primordial Star Systems talks about using the Table on page 22 to detemine the stars actual age. Problem is, there is no row in the table for Primordial stars. Protostars exist in the table, and the quote about determining age based on the table on 22 is identical between Protostar special rules and primordial.

So I simply used large star age generation which left me with 0.157 Million Years. But that just feels really low. Is there supposed to be a different way to generate age for primordial stars, or have I done it correctly despite being confused?

 

[Fluffy Bunny Feet]

Type O stars only live for about 10 million years. So while young your .157 million year old doesn't have that long left as stars go.

 

[Derpious]

So you think using the Large Star Age formula works well enough? Seemingly at least. I believe the Main Sequence Lifespan was approx 0.336 or so million years, and current age being 0.157

 

[Fluffy Bunny Feet]

Given how the star dies before the planets finish forming it won't affect the players or universe if it has 100,000 years left or the full 10 million so I'd say it is acceptable. From the point of human civilizations the star is likely effectively immortal and unchanging.

 

[rinku]

O-type main-sequence star - Wikipedia

en.wikipedia.org

The WBH sections on primordial systems you're looking at basically can't cope with these guys well; they're mostly for normal stars that happen to be very young. Honestly, I'd just go with a flat D6 million years old.

 

[Geir]

O-type main-sequence star - Wikipedia

en.wikipedia.org

The WBH sections on primordial systems you're looking at basically can't cope with these guys well; they're mostly for normal stars that happen to be very young. Honestly, I'd just go with a flat D6 million years old.

That's not a bad idea for O main sequence stars. It seem like stars above 8 solar masses don't really go through a Herbig phase, so the planetary system rules probably apply (a.k.a. lots of protoplanetary junk not enough time for planets to form by accretion and star ignition likely burns away all the volatiles). But the stars themselves seem to pop right into the main sequence.

 

[rinku]

The system age calculation is mostly to work out available planet types and likely native life, isn't it? So mostly, it's a bit academic for the larger stars. Even protoplanetary disk vs a bunch of rocks makes for mot much difference.