Capella A

I chose this star because it is also a part of the top 10 brightest stars in the sky which means it is one of the most known. It is the most prominent in the constellation Auriga and sixth brightest in the sky. It is a part of a star system composed of four stars in two binary pairs. The first two are giant stars and the second pair, around 10,000 astronomical units from the others, are two small, faint, and cool red dwarfs.

Star: Capella A

Chemical makeup: helium, carbon, oxygen

Location in space: Right ascension- 5 hr 16 min 41.4 sec
Declination- +45 degrees 59' 52.8"
42.2 light years from Sun

Spectrum analysis of most abundant chemical (helium):

 

https://en.wikipedia.org/wiki/Helium

Stellar classification: G5III red giant star

http://s585.photobucket.com/user/jlorea14/media/Holmesmap.jpg.html

Sources: 
100,000 Stars. (n.d.). Retrieved September 26, 2015, from http://stars.chromeexperiments.com/
Internet STELLAR DATABASE. (n.d.). Retrieved September 27, 2015, from http://www.stellar-database.com/
Capella. (n.d.). Retrieved September 27, 2015, from https://en.wikipedia.org/wiki/Capella

 Stars. (n.d.). Retrieved September 29, 2015, from http://www.astrophysicsspectator.com/topics/stars/RedGiants.html