You Must Know the Definition of All Terms That Are Bold Faced and Underlined

The Stars 1

·  You must know the definition of all terms that are bold faced and underlined.

Reading Packet 3.1

1.  What is stellar parallax ?

2.  How is our observation of the sky effected by parallax ?

3.  How large of a shift can be caused by the Earth’s motion ?

4.  What is a second of arc ?

5.  How is distance calculating using parallax ?

6.  Define a parsec. What is it’s relation to the light year ?

The Stars 2

Reading Packet 3.2

7.  What is spectroscopy ?

Reading Packet 3.3

8.  How are spectral lines produced ?

Know the following terms

Binding Energy

Ground state

Excited state

Photon

9.  What is the difference between an emission spectrum and a absorption spectrum ?

Reading Packet 3.4

10.  How is the spectra of stars created ?

Photosphere

Reading Packet 3.5

11.  What are Fraunhofer lines ?

Reading Packet 3.6

12.  Give the spectral classes of stars.

The Stars 3

Reading Packet 3.7

13.  How can you tell different stars apart if they are made of the same stuff ?

Reading Packet 3.8

14.  What is an ionized atom ?

15.  In what kind of stars do you find ionized atoms ?

16.  What kind of elements are found in K spectral stars ?

17.  What happens in cooler stars ?

Reading Packet 3.9

18.  What is space velocity ?

Radial motion

Proper motion

19. What is a Doppler shift? How can it be used to determine radial motion ?

Redshift

Blueshift

The Stars 4

20. Over time what is the effect of space motion ?

Reading Packet 3.10

21. What other properties of stars can be found from spectroscopy ?

Reading Packet 3.12

22. What is luminosity ?

23.Why does our sun look so bright ?

Reading Packet 3.13

24. Explain the inverse square law of luminosity

m / distance

Reading Packet 3.14

25. What is apparent magnitude

The Stars 5

26. What is the difference in brightness between apparent magnitudes on the magnitude scale ?

Reading Packet 3.15

27. What is absolute magnitude

28. What happens with magnitude when

A star is greater than 10 pcs away ?

A star is less than 10 pcs away

Reading Packet 3.17

29. Lets get it straight, what happens when :

High / low
Apparent magnitude
Absolute magnitude
Spectral class
Parallax angle

The Stars 6

Reading Packet 3.18

30.What is the H-R diagram ? How does it relate to spectral classes ? /

31 . What is a

brown dwarf (Uranus)? / Blue giant
Red Dwarf / Red giant
White Dwarf

Reading Packet 3.19

32. What does the location on the H-R diagram tell us about stars ? /

33. What determines where a star will appear on the main sequence ?

34. What stars make up the majority of the main sequence ?

The Stars 7

35. What is the relationship between mass and luminosity for main sequence stars ?

36.What is a binary star ? give an example

37. Describe the following types of binary stars and give examples

Type of binary star / Description / Example
Astrometric binary
Spectroscopic binary
Eclipsing binary
Optical double