Star System calculations

[Spartan159]

I am using the following formula for the calculation of habitable and other zones in a star system:

Inner Limit: R = 0.2 * M or R = 0.0088 * √L, whichever is greater.
Inner Habitable Zone: R = 0.95 * √L
Outer Habitable Zone: R = 1.3 * √L
Snow Line: R = 5 * √L
Outer Limit: R = 40 * M

M = Mass (Sol)
R = Radius in AU
L = Luminosity (Sol)

My question is this, for Binary star systems with a close or contact companion, do I simply add the values of the two stars together?

 

[Taav]

Rule Set

My question is this, for Binary star systems with a close or contact companion, do I simply add the values of the two stars together?

The "counter-"question is what rule-set did you select to generate your world?

 

[Spartan159]

The formulae are from GURPS Traveller First In, page 54 sidebar, but I am using stellar data from Bk 6 Scouts. I'm also using World Builders Handbook for world details.