KMC Forums - Question about Class F stars

Home » Community » General Discussion Forum » Question about Class F stars

Question about Class F stars
Started by: Autokrat

Forum Jump:

Last Thread Next Thread

Author

Thread

Lucius
Unknown

Gender: Unspecified
Location:

Question about Class F stars

I’ve been working on a hard science fiction project and I’ve been trying to figure out several things.

- How far away would a planet have to be if it was orbiting a Class F star (specifically 2.0 the luminosity of Sol) and be within the habitual zone to the point of having similar temperatures to Earth?

- And, how would that effect the seasons (assuming this world has a similar axial tilt to Earth.)

The only thing I've managed to discover about Class F stars is that plants on a planet in orbit around a Class F star would be orange or red instead of green.

Apr 4th, 2010 08:15 PM

Click here to Send Lucius a Private Message

Symmetric Chaos
Fractal King

Gender: Male
Location: Ko-ro-ba

Re: Question about Class F stars

quote: (post)
Originally posted by Autokrat
- How far away would a planet have to be if it was orbiting a Class F star (specifically 2.0 the luminosity of Sol) and be within the habitual zone to the point of having similar temperatures to Earth?

Lets see.

For a star with double the luminosity of Sol at 1AU it looks twice as bright and at 2AU it looks half as bright as Sol (inverse square law).

So the apparent luminosity should be the same at 1.41 AU.

quote: (post)
Originally posted by Autokrat
- And, how would that effect the seasons (assuming this world has a similar axial tilt to Earth.)

The seasons would be identical, just longer.

quote: (post)
Originally posted by Autokrat
The only thing I've managed to discover about Class F stars is that plants on a planet in orbit around a Class F star would be orange or red instead of green.

Why is that?

__________________

Graffiti outside Latin class.
Sed quis custodiet ipsos custodes?
A juvenal prank.

Apr 4th, 2010 08:47 PM

Click here to Send Symmetric Chaos a Private Message

Bardock42
Junior Member

Gender: Unspecified
Location: With Cinderella and the 9 Dwarves

Oh and it should be "affect", not "effect", might come in handy during the writing of the story.

__________________

Let me out, what you see is not the same person as me...

Apr 4th, 2010 08:49 PM

Click here to Send Bardock42 a Private Message

Lucius
Unknown

Gender: Unspecified
Location:

Re: Re: Question about Class F stars

quote: (post)
Originally posted by Symmetric Chaos
Lets see.

For a star with double the luminosity of Sol at 1AU it looks twice as bright and at 2AU it looks half as bright as Sol (inverse square law).

So the apparent luminosity should be the same at 1.41 AU.

The seasons would be identical, just longer.

Why is that?

Thanks for the help. The reason the plants would be orange and red is because apparently chlorophyll wouldn't be as efficient for photosynthesis due to the different wavelengths of light from a Class F star. I'm not sure what would replace it, but from all the sites I've visited I found the same thing that plants would use some kind or orange or red pigment.

Apr 4th, 2010 08:51 PM

dadudemon
Senior Member

Gender: Male
Location: Bacta Tank.

Re: Re: Question about Class F stars

quote: (post)
Originally posted by Symmetric Chaos
Lets see.

For a star with double the luminosity of Sol at 1AU it looks twice as bright and at 2AU it looks half as bright as Sol (inverse square law).

So the apparent luminosity should be the same at 1.41 AU.

The seasons would be identical, just longer.

You beat me to it. Good work.

quote: (post)
Originally posted by Symmetric Chaos
Why is that?

A class F star is hotter than a class G. Our sun is a class G. The hotter the star, the higher up the spectrum the star's light is. A class F would be a mostly white star.

So, a different "material" would have to be used to collect the sunlight.

I would think that black would be the best choice in any form of "visible" light stars.

So, it would be mavrophyll? lulz.

There could also be materials in the mavrophyll that would absorb light out side of the visible spectrum. That would be even cooler.

As to what he's talking about, I'm not sure. The reasons for not using the "green" portions of the EMS are not factually known beyond stupid purple bacteria from back in the day. Hell, there are things out there like red algae that don't use Red as much as the green plants do. It's just something that happened.

__________________

Apr 4th, 2010 09:34 PM

Click here to Send dadudemon a Private Message

Rogue Jedi
Restricted

Gender: Male
Location: On my way to the Cage

Account Restricted

Geeks.

__________________

All the ways you wish you could be, that's me. I look like you wanna look, I **** like you wanna ****, I am smart, capable, and most importantly, I am free in all the ways that you are not.

Apr 4th, 2010 10:00 PM

Click here to Send Rogue Jedi a Private Message

Mindship
Snap out of it.

Gender: Male
Location: Supersurfing

quote: (post)
Originally posted by Autokrat
I’ve been working on a hard science fiction project...

Worldbuilding? Novel?

__________________

Shinier than a speeding bullet.

Apr 4th, 2010 10:07 PM

Click here to Send Mindship a Private Message

Lucius
Unknown

Gender: Unspecified
Location:

quote: (post)
Originally posted by Mindship
Worldbuilding? Novel?

Worldbuilding for a book yes.

Apr 4th, 2010 10:11 PM

Mindship
Snap out of it.

Gender: Male
Location: Supersurfing

Cool. Enjoy.

__________________

Shinier than a speeding bullet.

Apr 4th, 2010 10:16 PM

jaden101
Restricted

Gender: Male
Location: North Philadelphia

Account Restricted

Re: Re: Re: Question about Class F stars

quote: (post)
Originally posted by dadudemon

There could also be materials in the mavrophyll that would absorb light out side of the visible spectrum. That would be even cooler.

As to what he's talking about, I'm not sure. The reasons for not using the "green" portions of the EMS are not factually known beyond stupid purple bacteria from back in the day. Hell, there are things out there like red algae that don't use Red as much as the green plants do. It's just something that happened.

I vaguely remember you and I having a similar discussion before and also discussing Silicon rather than Carbon based life.

__________________

You come at the King, you best not miss!

Apr 4th, 2010 11:41 PM

Click here to Send jaden101 a Private Message

dadudemon
Senior Member

Gender: Male
Location: Bacta Tank.

Re: Re: Re: Re: Question about Class F stars

quote: (post)
Originally posted by jaden101
I vaguely remember you and I having a similar discussion before and also discussing Silicon rather than Carbon based life.

Yup.

The algae discussion was one we had about oceanic deserts in the conspiracy forum about the "bloop". The other one we discussed about carbon based and silicon based lifeforms, occurred in here, the GDF, in the thread about life on mars and the Phoenix Rover.

__________________

Apr 5th, 2010 12:35 AM