Astronomer guru question!

[OamodSias]

Hey guys,

I wonder if you can help me.

I'm busy working on an exploration tool for myself; in it, I'd like to be able to capture star information. You enter the name, the spectral class, the class subdivision and the luminosity; however, it seems ED doesn't mention the subdivision of a star in the system map. Update: The map does tell you the star type; but on the Galaxy Screen not the System Map. What I would like to do, is enter the temperature of the star and have my app automatically select the right subdivision. So, for example, I enter the Sol system then in my app I enter its class and it's temp and it will automatically select the correct subdivision (2) and luminosity (V), outputting "G2V" (now I mention it, I could just enter the temp and get that info too).

My question is, what determines the subdivision number? I know it's from 0-9 (hot to cold), but at what temperature does that number change? What determines that Sol is a G2 and not a G3? For example. I'd like to be able have something like "if TEMP is between THIS and THAT then subdivision = 2."

I can't seem to find anything online. Anyone with any ideas?

Thanks.

 

[OamodSias]

Bump.

Nobody can assist?

 

[adoredtv]

Probably not an exact science but scroll down to the bottom of this link for a general idea - http://astro.unl.edu/naap/hr/hr_background1.html

 

[DeltaW7]

This give a range for temperatures

http://en.wikipedia.org/wiki/Stellar_classification

 

[OamodSias]

Probably not an exact science but scroll down to the bottom of this link for a general idea - http://astro.unl.edu/naap/hr/hr_background1.html

Dude, that's perfect! Thank you so much!
Have some rep. ^-^

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This give a range for temperatures

http://en.wikipedia.org/wiki/Stellar_classification

Yeah, that was my primary source - it just didn't explain what determines the subdivision.
Thanks though,