Download Astronomy Assignment #1

Astronomy Assignment #12
Your Name______________________________________
Your Class Meeting Time __________________________
This assignment is due on __________________________
Submit this cover sheet with your assignment.
Complete the assigned problems from the text listed below and address the Instructor Assigned Topic. Mathematical
problems may be hand written. Write out the problem, show your work in solving the problem and state your answer in
a complete sentence. Failure to complete all three of these tasks will result in less than full credit awarded. The
Instructor assigned topic must be typed.
Text Problems:
Unit Number
57
Questions for
Review
4, 5, 6, 7, 9 (refer to class
Problems
notes)
59
4, 5, 6, 7, 8, 9
60
61
5, 6, 7, 8, 9
4, 7, 9
11, 12, 14, 15 (Trick
Question)
11, 12, 15
Instructor Assigned Topic:
Create an HR diagram, using the blank HR diagram attached, for the 20 brightest stars and the 20 nearest star
systems. Use different colors or symbols so the two groups are easily distinguishable.
Using only the HR diagram, summarize the properties of the 20 brightest stars and the stars in the 20 nearest star
systems by comparing each to the Sun. Finally answer, and justify your answer, to the question “Is the Sun a
common star?”
I recommend that you write three paragraphs: 1st for the 20 brightest stars, 2nd for the 20 nearest star systems, and
3rd answer the question.
The Twenty Brightest Stars
Star
Sirius
Canopus
Alpha Centauri
Arcturus
Vega
Capella
Rigel
Procyon
Betelgeuse
Achernar
Beta Centauri
Altair
Alpha Crucis
Aldebaran
Spica
Antares
Pollux
Fomalhaut
Deneb
Beta Crucis
Multiple Star
System
Spectral
Type
Luminosity
Class
Apparent
Magnitude, m
Absolute
Magnitude, M
Distance,
lyrs
Yes
A1
F0
G2
K2
A0
G0
B8
F5
M2
B5
B1
A7
B1
K5
B1
M1
K0
A3
A2
V
Ib/II
V
III
V
III
Ia
IV
Ia/Ib
V
III
IV
IV
III
V
IB
III
V
Ia
-1.46
-0.72
-0.01
-0.06
0.04
0.05
0.14
0.37
0.41
0.51
0.63
0.77
1.39
0.86
0.91
0.92
1.16
1.19
1.26
1.4
-3.1
4.4
-0.3
0.5
-0.7
-6.8
2.6
-5.5
-1
-4.1
2.2
-4
-0.2
-3.6
-4.5
0.8
2
-6.9
8.8
98
4.3
35.9
26.1
46
815
11.4
490
65.2
295
16.6
390
52.2
260
390
39.1
22.8
2,600
B0
IV
1.28
-4.6
490
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
2
Common Name
Alpha Centauri A
Alpha Centauri B
Proxima Centauri
Barnard's Star
Wolf 359
Lalande 21185
Sirius
Sirius B
Catalog
Name
epsilon Indi
DX Cancri
tau Ceti
Gl 559 A
Gl 559 B
Gl 551
Gl 699
Gl 406
Gl 411
Gl 244 A
Gl 244 B
Gl 65 A
Gl 65 B
Gl 729
Gl 905
Gl 144
Gl 887
Gl 447
Gl 866 A
Gl 866 B
Gl 866 C
Gl 280 A
Gl 280 B
Gl 820 A
Gl 820 B
Gl 725 A
Gl 725 B
Gl 15 A
Gl 15 B
Gl 845
GJ 1111
Gl 71
RECONS 1
GJ 1061
UV Ceti
Ross 154
Ross 248
epsilon Eridani
Lacaille 9352
Ross 128
EZ Aquarii
Procyon
61 Cygni
The Twenty Nearest Star Systems
Multiple
Apparent
Spectral
Luminosity
Star
Magnitude,
Type
Class
System
m
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
G2
K0
M5.5
M4.0
M6.0
M2.0
A1
White Dwarf
M5.5
M6.0
M3.5
M5.5
K2
M1.5
M4.0
M5.0
------F5 I
White Dwarf
K5.0
K7.0
M3.0
M3.5
M1.5
M3.5
K5
M6.5
G8
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
--IV
V
V
V
V
V
V
Ve
V
Vp
0.01
1.34
11.09
9.53
13.44
7.47
-1.43
8.44
12.54
12.99
10.43
12.29
3.73
7.34
11.13
13.33
13.27
14.03
0.38
10.7
5.21
6.03
8.9
9.69
8.08
11.06
4.69
14.78
3.49
M5.5
V
13.03
Absolute
Magnitude,
M
Distance,
lyrs
4.38
5.71
15.53
13.22
16.55
10.44
1.47
11.34
15.4
15.85
13.07
14.79
6.19
9.75
13.51
15.64
15.58
16.34
2.66
12.98
7.49
8.31
11.16
11.95
10.32
13.3
6.89
16.98
5.68
4.36
4.40
4.22
5.96
7.78
8.29
8.58
8.58
8.72
8.72
9.68
10.32
10.52
10.74
10.91
11.26
11.26
11.26
11.40
11.40
11.40
11.40
11.52
11.52
11.62
11.62
11.82
11.82
11.88
15.21
11.92
3
HR Diagram
30,000 K
-10
9,500 K
7,200 K
6,000 K
5,250 K
3,800 K
1,000 R
60 M
-5
17.5 M
100 R
Absolute Magnitude
5.9 M
2.9 M
0
1.8 M
10 R
1.2 M
0.1 R
1.0 M
5
Sun
.67 M
1 R
0.01 R
10
.21 M
0.001 R
15
20
O
B
A
F
G
K
M
Spectral Type
4
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