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NOTES: Spectral Class (Color-Temperature Class) : Annie Jump Cannon (1912) classified dark lines for 200,000 stars! O B A F G K M <----------------- T BLUE RED Subclasses : Sun is a G2V star.

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slide1

NOTES: Spectral Class (Color-Temperature Class):

Annie Jump Cannon (1912) classified dark lines for 200,000 stars!

O B A F G K M

<-----------------

T

BLUE RED

Subclasses: Sun is a G2V star.

A. 1-10 Spectral Subclass.

B. Luminosity Class I-V (I--supergiant, V--main sequence).

The Evolution of a Star:

Hertzsprung-Russell Diagram (1910): A plot of Luminosity vs Surface Temperature, T (see overlay). A one solar mass star like the sun goes through the stages of: protostar, main sequence, red giant, planetary nebula, white dwarf.

slide2

Spectral Class (Color-Temperature Class):

Annie Jump Cannon (1912) classified dark lines

for 200,000 stars!

O B A F G K M

Pnemonic: Oh Be A Fine Geek, Kiss Me

slide5

Subclasses: Sun is a G2V star.

A. 1-10 Spectral Subclass.

B. Luminosity Class I-V (I--supergiant, V--main sequence).

slide6

Nearby stars can be plotted--

Luminosity vs Surface Temperature, T:

slide8

The majority of stars lie on the main sequence

of the H-R Diagram where they burn Hydrogen in their cores.

slide9

Arthur Eddington’s great discovery!

Mass determines stages of star life.

Analogy: weigh the baby at birth,

and know everything that

will happen to the baby.

He also proved stars bend light

Like Einstein’s theory suggests.

slide10

Also he suggested that star pressure balances gravity.

The outward pressure is created by heat and light.

slide11

The Hertzsprung-Russell, or H-R Diagram allows us

to plot the stages of life of stars from their initial mass.

Lifetime of a 1 solar mass star

slide12

Multiple Star Systems:

More than half have companions.

Most are: Binaries.

slide13

Optical double--a false binary

--two stars not bound together, one at a greater distance.

Albireo, an optical double. 10/25/03

slide14

Spectroscopic binary:

We don\'t see separate stars, just separate spectra

slide16

Visual binary--actually seen as separate.

Castor in Gemini: a visual binary

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