making a color magnitude diagram for globular cluster omega centauri
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Making a Color-Magnitude Diagram for Globular Cluster Omega Centauri. Jay Anderson, STScI. 1. This is the Early-Release Image of Omega Centauri, taken by WFC3/UVIS on board the Hubble Space Telescope (HST). http://hubblesite.org/gallery/wallpaper/pr2009025q/. 2.

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Presentation Transcript
slide2
This is the Early-Release Image of Omega Centauri, taken by WFC3/UVIS on board the Hubble Space Telescope (HST)

http://hubblesite.org/gallery/wallpaper/pr2009025q/

2

slide13
They like to sort the stars by color, putting the blue stars on the left and the red stars on the right.

13a

slide14
They like to sort the stars by color, putting the blue stars on the left and the red stars on the right.

13b

slide15
They like to sort the stars by color, putting the blue stars on the left and the red stars on the right.

13c

slide16
They like to sort the stars by color, putting the blue stars on the left and the red stars on the right.

13d

slide17
They like to sort the stars by color, putting the blue stars on the left and the red stars on the right.

13e

slide18
They like to sort the stars by color, putting the blue stars on the left and the red stars on the right.

13f

slide19
They like to sort the stars by color, putting the blue stars on the left and the red stars on the right.

13g

slide20
They like to sort the stars by color, putting the blue stars on the left and the red stars on the right.

13h

slide21
They like to sort the stars by color, putting the blue stars on the left and the red stars on the right.

13i

slide22
They like to sort the stars by color, putting the blue stars on the left and the red stars on the right.

13j

slide23
They like to sort the stars by color, putting the blue stars on the left and the red stars on the right.

13k

slide24
Note that there are very few extreme stars; most stars are white, meaning they have a balanced spectrum.

14

they like to sort the stars putting the bright stars on top and the faint stars on the bottom
They like to sort the stars, putting the bright stars on top, and the faint stars on the bottom.

15a

they like to sort the stars putting the bright stars on top and the faint stars on the bottom1
They like to sort the stars, putting the bright stars on top, and the faint stars on the bottom.

15b

they like to sort the stars putting the bright stars on top and the faint stars on the bottom2
They like to sort the stars, putting the bright stars on top, and the faint stars on the bottom.

15c

they like to sort the stars putting the bright stars on top and the faint stars on the bottom3
They like to sort the stars, putting the bright stars on top, and the faint stars on the bottom.

15d

they like to sort the stars putting the bright stars on top and the faint stars on the bottom4
They like to sort the stars, putting the bright stars on top, and the faint stars on the bottom.

15e

they like to sort the stars putting the bright stars on top and the faint stars on the bottom5
They like to sort the stars, putting the bright stars on top, and the faint stars on the bottom.

15f

they like to sort the stars putting the bright stars on top and the faint stars on the bottom6
They like to sort the stars, putting the bright stars on top, and the faint stars on the bottom.

15g

they like to sort the stars putting the bright stars on top and the faint stars on the bottom7
They like to sort the stars, putting the bright stars on top, and the faint stars on the bottom.

15h

they like to sort the stars putting the bright stars on top and the faint stars on the bottom8
They like to sort the stars, putting the bright stars on top, and the faint stars on the bottom.

15i

they like to sort the stars putting the bright stars on top and the faint stars on the bottom9
They like to sort the stars, putting the bright stars on top, and the faint stars on the bottom.

15j

they like to sort the stars putting the bright stars on top and the faint stars on the bottom10
They like to sort the stars, putting the bright stars on top, and the faint stars on the bottom.

15k

slide38
When Astronomers first plotted stars this way, they realized that stars don’t fall just anywhere in the diagram.

17

slide40
The unmistakable order in diagrams like this led astronomers to develop theories to explain stellar evolution.

19

slide42
Stars don’t move along this sequence; rather they sit at the same place for a long time fusing their hydrogen into helium.

MS

20b

slide43
This is a sequence in mass. Stars at the bright end are massive, and those at the faint, red end have very low masses.

MS

20c

the more massive stars consume their hydrogen fuel much faster than the lower mass stars
The more massive stars consume their hydrogen fuel much faster than the lower-mass stars.

MS

20d

slide45
When fuel becomes sparse in the stellar core, stars readjust their internal structure and move red-ward along the Sub-Giant Branch (SGB).

SGB

MS

21

slide46

RGB

They start to burn the hydrogen in a shell around the core and become big and bloated as they move up the Red Giant Branch (RGB).

SGB

MS

22a

slide51

RGB

HB

That is why there are so few stars on the HB compared to the MS. Stars do not spend much time on the HB.

SGB

MS

23c

slide52

RGB

HB

When the helium is gone, the star has no more fuel. With nothing left to burn, it fades away into blue darkness as a White Dwarf (WD).

SGB

WD

MS

24

slide53

RGB

HB

SGB

WD

MS

Since a star’s color and brightness tell us its evolutionary phase, we can easily identify stars by phase in the image.

25

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