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Astronomical Measurements

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Other measurementsEdit

R☉           Solar Radius

M☉          Solar Mass

L☉           Solar Luminosity

AU           Astronomical Unit                =149.597.871 km



Harvard ClassificationEdit

Class IEdit

White and blue stars with broad heavy hydrogen line

This includes the modern class A and early class F. Some include early class B.


Class IIEdit

Yellow stars

Hydrogen less strong, but evident metallic lines

This includes the modern classes G and K as well as late class F.


Class IIIEdit

Orange to red stars with complex band spectra

This corresponds to the modern class M.


Class IVEdit

Red stars with significant carbon bands and lines (carbon stars.)


Class VEdit

Emission-line stars.




Secchi ClassificationEdit

Edit

Temperature          ≥ 35000  ºC
Color                      Blue
Mass                     ≥ 16 M☉
Radius                   ≥ 6.6 R☉
Luminosity             ≥ 30,000 L☉
Hydrohen Lines      Weak



B Edit

Temperature          9700- 33,000 ºC
Color                     Deep Blue/ White
Mass                     2.1–16 M☉
Radius                   1.8–6.6 R☉
Luminosity             25–30,000 L☉
Hydrohen Lines      Medium

AEdit

Temperature          7200-9800 ºC
Color                      Blue White
Mass                     1.4–2.1 M☉
Radius                   1.4–1.8 R☉
Luminosity             5–25 L☉
Hydrohen Lines      Strong

FEdit

Temperature          5800- 9800 ºC
Color                      Yellow White
Mass                     1.04–1.4 M☉
Radius                   1.15–1.4 R☉
Luminosity             1.5–5 L☉
Hydrohen Lines      Medium


GEdit

Temperature          5000-5800 ºC
Color                     Yellowish White         
Mass                     0.8–1.04 M☉
Radius                   0.96–1.15 R☉
Luminosity             0.6–1.5 L☉
Hydrohen Lines      Weak


KEdit

Temperature            3500- 5000 ºC
Color                      Pale Yellow/Orange
Mass                     0.45–0.8 M☉
Radius                   0.7–0.96 R☉
Luminosity             0.08–0.6 L☉
Hydrohen Lines      Very weak


MEdit

Temperature         1700- 3500 ºC
Color                    Red, Light Orange/ Red  
Mass                   ≤ 0.45 M☉
Radius                  ≤ 0.7 R☉
Luminosity             ≤ 0.08 L☉
Hydrohen Lines      Very weak


LEdit

Temperature           1000- 1700 ºC
Color                      Red Brown, Scarlet
Mass                     n/a
Radius                   n/a
Luminosity             n/a
Hydrohen Lines      Extremely Weak


TEdit

Temperature           400- 1000ºC
Color                      Brown, Magenta
Mass                     n/a
Radius                   n/a
Luminosity             n/a
Hydrohen Lines      Extremely Weak


YEdit

Temperature           ≤ 400 ºC


Color                      Dark Bown, Dark Purple
Mass                     n/a
Radius                   n/a
Luminosity              n/a
Hydrohen Lines      Extremely Weak

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