Measuring the Stars (Part III)

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The “. Cosmic Distance Ladder. ”. Visual. “. Parallax. ”. “. Binocular. Vision”…. Let’s us “see” 3D images . (depth). …but, how to do this to get . Astronomical Distances. ?. “. ID: 729349 Download Presentation

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Measuring the Stars (Part III)




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Presentations text content in Measuring the Stars (Part III)

Slide1

Measuring the Stars

(Part III)

Slide2

Slide3

The “

Cosmic Distance Ladder

Slide4

Slide5

Slide6

Visual

Parallax

Slide7

Binocular

Vision”…

Let’s us “see” 3D images

(depth)

…but, how to do this to get

Astronomical Distances

?

Slide8

Stellar Parallax”

Using

Earth’s Orbit

as a “Baseline”!

Slide9

Slide10

Slide11

Slide12

Standard Candles

as

Distance Indicators

... :

 

(Measured)

(

Known

,

“Standard Candle”!)

(

C

an now be

Calculated

!)

Slide13

Slide14

Main Sequence

Stars as

Standard Candles

!

Slide15

(Both

K

-type

!)

But how to

tell apart

Main Sequence stars

from non-Main-Seq. stars,

for Spectroscopic Parallax…?

Small,

Dense

(Main Seq.) stars have

broader

Spectral Lines

than

“puffy”

Giant stars… :

Slide16

Slide17

Slide18

Turning

“Variable Stars”

into

Standard Candles

for finding distances... :

Cepheid “

Period-Luminosity Relationship

Slide19

Slide20

If

(

) now

known

 This Rotating Galaxy is a

Standard Candle

!

 

Faster

Rotation

More

Gravity

More

Mass

More

Light

(…we

assume

…!)

Slide21

Slide22

White Dwarfs (w/companions) always

blow up

(“

Type

Ia

Supernova

”) at the

Chandrasekhar Mass

(

M

= 1.4 x

M

Sun):

…Standard Explosion

 Standard Luminosity  Standard Candle

!

Slide23

Know

Distance to

a

Supernova

Know Distance

to its

Host Galaxy

Can

“Map”

the

Cosmic

Large-Scale

(Galactic)

Structure!

Slide24

Brighter

Supernovae

glow longer

than

dimmer

Supernovae…

Since

1995,

Type

Ia

Su

pernovae

now have

very well known

Luminosities…

 

Even better

Standard Candles

!

Slide25

1998

: Type

Ia

Supernova Standard Candle data proved that

the

Expansion Rate of the Universe is

Accelerating

!

Slide26

2011

Slide27

Slide28

Hubble’s Law

”:

V = H

0

x D

(Velocity =

Hubble’s Constant

x

Distance

)

Other Galaxies all

Doppler

Redshifted

Expanding Universe

makes them

recede

from us!

Slide29

Slide30

Cosmic Distance

Mapping the

Universe??

Ladder

Slide31

Cosmic Distance Ladder

Mapping the Universe

!


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