2006-07-25 08:23:33 · 7 answers · asked by Jason p 1 in Science & Mathematics ➔ Astronomy & Space
If you specifically are referring to absolute magnitude color indicies such as B-V, or V-I etc, keep in mind that the sensititivity of the index to temperature is itself temperature dependent (this is because it is hard to fit a "black body" curve (aka a planck function) with only two data points. These indicies are essentially ratios of the brightness at different color bands because magnitudes are a logarithmic scale (and when you subtract logarithms, the result is the log of the ratio of the original quantities).
I can't remember if it is Astrophysical Formulae or Astrophysical Quantities that has VERY nice set of tables for going between photosphere temperature and color index for a variety of indicies. Check 'em out in your local university library.
I think it is Astrophysical Formulae
I am pretty sure it is Astrophysical Formulae. . .
2006-07-25 11:15:13 · answer #1 · answered by Mr. Quark 5 · 0⤊ 0⤋
Yes. What exactly is the question? The surface temperature of a star determines the color, redder = cooler and blue is hotter. Works similarly to a light bulb, (not exactly but) it's a thermal process. Light from within is absorbed and re-radiated so the surface temp determines the color.
2006-07-25 08:37:20 · answer #2 · answered by seedy v 2 · 0⤊ 0⤋
Hi, of course if you want i can give you example.
Color color index Effective temperature (k) Example
1.Blue -0.3 28000 , 50 000 Roi
2.Blue -0.2 9900 , 28000 Rigel
3. Yellow 0.0 6000, 7400 Procyon
4.Yellow 0.7 49000, 6000 Sun
5.Orange 1.2 3500 , 4900 Arcturus
6.Red 1.4 2000 , 3500 Betelgeus
2006-07-25 08:46:02 · answer #3 · answered by snow g 1 · 0⤊ 0⤋
a million. Stars of which colour have the utmost floor temperature? (a million component) (0 pts) crimson (0 pts) Orange (0 pts) Yellow (a million pts) Blue 2. Stellar distances are commonly expressed in what contraptions? (a million component) (0 pts) Miles (0 pts) Kilometers (a million pts) easy-years (0 pts) not one of the above 3. The diploma of a megastar’s brightness is named its ____. (a million component) (a million pts) value (0 pts) parallax (0 pts) intensity (0 pts) colour index
2016-12-14 13:47:06 · answer #4 · answered by ater 4 · 0⤊ 0⤋
Yes. This is true of all hot things, not just stars. For example, a white hot iron is way hotter than a red hot iron.
2006-07-25 08:50:19 · answer #5 · answered by campbelp2002 7 · 0⤊ 0⤋
yes, a blue star is coolest, yellow is medium, red hotter, and white is the hottest, white hot stars burn out faster than any other star
2006-07-29 11:50:40 · answer #6 · answered by charles w 2 · 0⤊ 0⤋
yes?
2006-07-25 08:27:43 · answer #7 · answered by Anonymous · 0⤊ 0⤋