Fall Double Stars

09 November 2010 ASTR 110L, Sec. 1 Name: ________________

Sketch as many of the double/multiple star systems as we are able to observe, noting the following characteristics:
(a) Relative brightness of the stars (use bigger or smaller dots);
(b) Apparent separation of the stars (compared to others seen tonight);
(c) Colors of the stars (write on sketch — indicate stars).

β Lyrae multiple star
d = 882 ly
ε Lyrae quadruple star!
d = 161 ly
 
β Cygni apparent double
dorange = 385 ly
dblue = 376 ly
61 Cygni double star
d = 11.4 ly
 
γ Delphinus double star
d = 102 ly
70 Ophiuchus double star
d = 16 ly
P = 88 yr
 
β Cepheus double star
d = 595 ly
δ Cepheus double star
d = 980 ly
η Cassiopeia double star
d = 19 ly
P = 480 yr
σ Cassiopeia double star
d = 1500 ly
 
ι Cassiopeia triple star
d = 142
γ Andromeda triple star
d = 355 ly
 
ε Pegasus triple star?
d = 670
α1 α2 Capricornus apparent double
d1 = 690 ly
d2 = 109 ly
 
α Ursa Minor double star
d = 431

Joshua E. Barnes      (barnes at ifa.hawaii.edu)
Updated: 8 November 2010
http://www.ifa.hawaii.edu/~barnes/ast110l_f10/doublestars.html
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