What Color Are The Stars And How Hot Are They?

Рет қаралды 14,942

7 жыл бұрын

In this video I teach about the color of the stars and how you can predict the temperature of stars quite accurately based on their color. The formula that I use in the video for converting RGB color values to temperature is from this paper found in this stack exchange link:
dsp.stackexchange.com/question...
I actually had to correct this formula slightly by applying Temp=400*CCT+5220 to it. Then it worked great! RGB values are actually quite difficult to predict temperatures from because there are only certain wavelengths that are produced by black body radiation. For example there is no green in the black body radiation color scale.
Thumbnail star scale is from :
CC BY-SA 3.0, commons.wikimedia.org/w/index...
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Пікірлер: 26

@zinzolin14 3 жыл бұрын

"Have you ever wondered what colour stars are?" ... Well now I do.

@daniellesweeney5625 7 жыл бұрын

I FRIGGIN' LOVE SPACE.

@readyplayeridk8571 3 жыл бұрын

Yes! And when you go into it you get suffocated, burned, frozen and boiled!

@duck1047 3 жыл бұрын

OMG SAME ASTRONOMY 🔭

@codyrobinson1982 2 жыл бұрын

This deserves to be posted again. Ty for making the world fun

@Sam-ze9mo 7 жыл бұрын

This is really cool!

@MammaOVlogs 7 жыл бұрын

wow way interesting! l loved it!

@jamesrobert7155 4 жыл бұрын

Is our vision skewed somewhat though looking through our atmosphere?

@lakshaystyles8985 3 жыл бұрын

What should I comment so you'd reply?

@deviscrimson3360 7 жыл бұрын

But what will be the unit of temperature? will it be in kelvin(K)?

@ActionLabShorts 7 жыл бұрын

Yes it will be kelvin

@yashsvidixit7169 2 жыл бұрын

I think you missed about the white balance in the RGB equation.

@DeathDome_ 8 ай бұрын

yes

@heidix1513 3 жыл бұрын

😊😊😍

@ratdude010 3 жыл бұрын

Problem with this method is that it fails to take into account the Doppler effect from stars moving away from or toward the camera. Since the stars are visible with the naked eye, this is probably negligible. Not sure how they determine the Doppler effect, if the only thing they have is a stars color. You neither know the exact temperature or the stars speed.

@yashsvidixit7169 2 жыл бұрын

They use spectroscopy. Different elements have different spectral lines. Doppler shift will shift all those lines. My matching the pattern with known spectral lines, one can deduce the red shift.

@ratdude010 2 жыл бұрын

Yea, but how would they know the element itself? For example (and this is way oversimplified), if helium produces a red color normally, and is blue, couldn’t that simply be another element? There might be characteristics like the number of spectral lines present in certain elements; the whole thing is a bit confusing though.

@yashsvidixit7169 2 жыл бұрын

@@ratdude010 let's talk about, say, Carbon. The spectral lines it produces looks like this. en.wikipedia.org/wiki/Spectral_line#/media/File:Carbon_spectrum_visible.png Now, if the light(with carbon's spectral lines) coming from a star experiences a Doppler shift, then all the wavelength will be multiplied by the same factor. So even in the shifted spectrum of received light, you will able to identify the carbon's spectral lines pattern. because the relative ratios of the wavelength of spectral lines will be preserved. Does that make more sense?

@ratdude010 2 жыл бұрын

@@yashsvidixit7169 Thanks, I think so; all colors shift proportionately to one another though? IE. Red light shifts proportionately the same as blue light from the same body?

@yashsvidixit7169 2 жыл бұрын

@@ratdude010 Yes,, for every wavelength, the multiplication factor is the same. So the shifts are all proportional. So, patterns are preserved.