World Builder's Handbook: Class IV K stars.

[Derpious]

I noticed that, there's no information about Class IV K stars after K0, but it says earlier that Class IV K-type stars can have subtypes up to SubType 4.
Any suggestions about how to calculate or something similar?

 

[Geir]

I noticed that, there's no information about Class IV K stars after K0, but it says earlier that Class IV K-type stars can have subtypes up to SubType 4.
Any suggestions about how to calculate or something similar?

I can tell you what my spreadsheet did for aK4 IV: hold the mass steady at 1.5 and the diameter steady at 6, and decrease the temperature as normal for a K4 to 4560K. That will reduce luminosity accordingly to about 14.0235.

So for all of K0-4 IV, its the same mass of 1.5 Sol and diameter of 6 Sol with decreasing temperature and luminosity.

 

[Derpious]

Sweet, Thanks!

 

[Derpious]

I noticed it's the same for Class VI B stars. Since A0 VI doesn't exist in the table, B6, 7, 8, 9 VI doesn't exist either.

I assume it's the same thing there? Temp drops but mass and diam stays steady?

 

[Geir]

I noticed it's the same for Class VI B stars. Since A0 VI doesn't exist in the table, B6, 7, 8, 9 VI doesn't exist either.

I assume it's the same thing there? Temp drops but mass and diam stays steady?

That's a good assumption. I didn't do it that way in the spreadsheet, but I should have (I stepped it between B5 and G0, but those steps are too big... gotta fix it)

 

[coolAlias]

For my part, I used the difference betwen K0 and G5 as an approximation of the difference that should occur between K5 and M0.

I.e. 1.5 (K0 IV mass) - 1.2 (G5 IV mass) = 0.3, so 1.5+0.3 = 1.8 as the approximate mass of a theoretical K5 IV, then used to interpolate K1-K4.

Similarly, for B5-B9 VI, I used 0.3 (0.4-0.5 = -0.1+0.4 = 0.3) as the mass of a theoretical A0 VI.

Then I did the same for Diameter and Luminosity.

Of course, being neither astronomer nor physicist, that's probably completely wrong.