Steve Jackson Games Forums [ SPACE 4e ] Minimum Luminosity
 User Name Remember Me? Password
 Register FAQ Calendar Mark Forums Read

 Thread Tools Display Modes
 07-21-2019, 08:18 PM #1 manhamster   Join Date: Jul 2019 [ SPACE 4e ] Minimum Luminosity I have not turned up entries concerning this. Concerns the minimum luminosity table ( correction the L-Min on the Stellar Evolution Table ). Does anyone know the possible formula for behind those L-Min numbers? Probably not the actual scientific formula unless you think that was the one used. I tried some variations, going with the assumption that it is calculated based on stellar mass ( in Sols ), but with no luck. I am inquiring partly of out curiosity and the other part is using a formula ( in a project I am toying with ) would be more efficient than doing a bunch of IF statements ( what I'm using is not Excel so I do not have the benefit of using VLOOkUP ). Last edited by manhamster; 07-22-2019 at 10:07 AM.
 07-21-2019, 09:34 PM #2 Captain Joy     Join Date: Nov 2006 Location: Heartland, U.S.A. Re: [ SPACE 4e ] Minimum Luminosity Could you clarify a bit? You’re asking for a “formula” for luminosity as a function of mass for low-mass stars? __________________
07-21-2019, 09:49 PM   #3
Sunrunners_Fire

Join Date: Mar 2010
Location: Bullhead City, AZ
Re: [ SPACE 4e ] Minimum Luminosity

Quote:
 Originally Posted by manhamster I have not turned up entries concerning this. Concerns the minimum luminosity table. Does anyone know the possible formula for minimum luminosity? I tried some variations, going with the assumption that it is calculated based on stellar mass ( in Sols ), but with no luck. I am inquiring partly of out curiosity and the other part is using a formula ( in a project I am toying with ) would be more efficient than doing a bunch of IF statements ( what I'm using is not Excel so I do not have the benefit of using VLOOkUP ).
"minimum luminosity" for ...? Minimum to do what?

Absent clarification, more information can be found here.
__________________
"Art thou wroth? Wherefore art thou wroth, brother?"

07-21-2019, 09:50 PM   #4
Agemegos

Join Date: May 2005
Location: Oz
Re: [ SPACE 4e ] Minimum Luminosity

Quote:
 Originally Posted by Captain Joy Could you clarify a bit? You’re asking for a “formula” for luminosity as a function of mass for low-mass stars?
I think the OP wants a formula for the luminosity of a star at the beginning of its life on the main sequence, as a function of mass. That's the value given as "L-Min" on the Stellar Evolution Table, p. 103 of GURPS Space.

In real astrophysics that is called the "zero-age main sequence luminosity". There's a fitted analytical function on the second page of Tout, C. A., Pols, O. R., Eggleton, P. P., & Han, Z. "Zero-age main-seqence radii and luminosities as analytic functions of mass and metallicity" Monthly Notices of the Royal Astronomical Society, Volume 281, Issue 1, pp. 257-262, but I don't think you're going to like it.
__________________
© copyright Brett Evill
FLAT BLACK discussion group at tekeli.li
On-line texts at flatblack.wikidot.com

Last edited by Agemegos; 07-21-2019 at 10:18 PM.

 07-22-2019, 12:54 AM #5 Anthony   Join Date: Feb 2005 Location: Berkeley, CA Re: [ SPACE 4e ] Minimum Luminosity In practice, starting with a table of values and extrapolating will get you closer than you can possibly need for gaming. __________________ My GURPS site and Blog.

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Fnords are Off [IMG] code is Off HTML code is Off Forum Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Illuminati Headquarters     SJ Games Discussion     Daily Illuminator     Forum Feedback and Help Warehouse 23     Warehouse 23 General Discussion     Warehouse 23 Digital     Pyramid Munchkin     Munchkin 101     Munchkin     Munchkin Collectible Card Game     Other Munchkin Games Roleplaying     Dungeon Fantasy Roleplaying Game         DFRPG Resources     GURPS         GURPS Resources         GURPS Character Assistant     Transhuman Space     Traveller     The Fantasy Trip         The Fantasy Trip: House Rules     In Nomine     Roleplaying in General     Play By Post Board and Card Games     Car Wars         Car Wars Old Editions     Ogre and G.E.V.         Ogre Video Game         Ogre Scenarios     Board and Dice Games     Card Games     Miniatures The Gnomes of Zurich     The Industry     Conventions     Trading Post     Gamer Finder

All times are GMT -6. The time now is 02:31 PM.

 Contact Us - Steve Jackson Games - Privacy Statement - Top

Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2019, vBulletin Solutions, Inc.