Color index: Difference between revisions

Revision as of 22:38, 5 May 2024

Revision as of 04:47, 10 May 2024

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|+Quantitative color index terms<ref name=":0">{{Cite journal |last=Neuhäuser |first=R |last2=Torres |first2=G |last3=Mugrauer |first3=M |last4=Neuhäuser |first4=D L |last5=Chapman |first5=J |last6=Luge |first6=D |last7=Cosci |first7=M |date=2022-07-29 |title=Colour evolution of Betelgeuse and Antares over two millennia, derived from historical records, as a new constraint on mass and age |url=https://doi.org/10.1093/mnras/stac1969 |journal=Monthly Notices of the Royal Astronomical Society |volume=516 |issue=1 |pages=693–719 |doi=10.1093/mnras/stac1969 |issn=0035-8711|arxiv=2207.04702 }}</ref>

!Color (Vega reference)

!Color (human eye)

!Color index (B-V)

!Spectral class ([[main sequence]])

!Spectral class ([[Giant star|giant stars]])

!Spectral class ([[supergiant stars]])

!Examples&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

|-

|Red

|Orange

|≥1.40

|M

|K4-M9

|K3-M9

|[[Aldebaran]], [[Betelgeuse]], [[Antares]]

|-

|Orange

|Cream

|0.80-1.40

|K

|G4-K3

|G1-K2

|[[Arcturus]], [[Pollux (star)|Pollux]], [[Arcturus]]

|-

|Yellow

|Warm white

|0.60-0.80

|G

|G0-G3

|F8-G0

|[[Sun]], [[CapellaRigil Kent]]

|-

|"Green"{{efn|Such stars would not be seen as green, but either as whitish or yellow.|name=green}}

|Cool white

|0.30-0.60

|F

|F

|F4-7

|[[PolarisProcyon]]

|-

|White

|Bluish white

|0.00-0.30

|A

|A

|A0-F3

|[[Sirius]], [[CanopusVega]]

|-

|Blue

|Blue

| -0.33-0.00

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|OB

|OB

|[[RigelSpica]], [[BellatrixRigel]]

|}

The common color labels (eg. red supergiant) are taken using the star Vega as the reference. However, these labels don't reflect how the human eye would perceive the colors of these stars. Vega has a bluish white color. From outer space, the Sun would look like a neutral white somewhat warmer than the [[illuminant D65]] (which may be considered a slightly cool white).

==See also==