Jose Chacon
Adriana Correa
Alejandro Ramos
Lab 10
Part I: Apparent and Absolute Magnitudes Worksheet.
1)
a. m
b. M
c. M
2)
a. -6.9
3)
3a. Star D.
3b. Star D.
3c. Apparent magnitude increases making it fainter, and absolute magnitude stays the
same.
3d. Star E (Furthest), Star C, Star D, Star A&B are the same (Closest)
Part II: Determining the Distances from Photometry
The following table contains the results of observing a young cluster of stars. Your job is to
complete the table.
Table 1: Photometry Data
Star
B
V
B-V
M
Spectral
Type
D(pc)
1*
4.47
4.63
-0.16
-1.1
B5
140
2
14.2
13.0
1.2
7.3
K5
138
3
12.5
11.6
0.9
2.0
A5
832
4
9.55
9.13
0.42
3.4
F5
115
5
10.7
10.1
0.6
4.4
G0
138
6
16.1
14.7
1.4
9.0
M0
138
7
5.03
5.03
0
-.07
A0
105


8
11.5
10.8
0.7
5.9
K0
95
9
8.60
8.33
0.27
2.6
F0
140
10
7.86
7.73
0.13
2.0
A5
196
B = the apparent magnitude mB measured through a filter that is centered at 445 nm (Blue).
V = the apparent magnitude mV measured through a filter that is centered at 551 nm (Peak of
Visible).