Antares

 Antares

I chose Antares because it is a bright star called the heart of the scorpion.
Chemicals: Hydrogen and Helium
Location: RA 16^h 29^m 24.45970^s | Dec -26° 25′ 55.2094''
Stellar Classification: red supergiant of spectral type M0.5Iab

Antares, also known by its Bayer designation Alpha Scorpii (abbreviated to α Scorpii or α Sco), is the fifteenth brightest star in the nighttime sky and the brightest star in the constellation Scorpius, and is often referred to as "the heart of the scorpion". Along with Aldebaran, Regulus, and Fomalhaut, Antares comprises the group known as the 'Royal stars of Persia'. It is one of the four brightest stars near the ecliptic.

Distinctly reddish when viewed with the unaided eye, Antares is a red supergiant of spectral type M0.5Iab and is one of the largest and most luminous observable stars. It is a slow irregular variable star with the quoted magnitude of +0.96. Antares is the brightest, most massive, and most evolved stellar member of the nearest OB association (the Scorpius-Centaurus Association).

It is located at RA 16^h 29^m 24.45970^s | Dec -26° 25′ 55.2094'' and contains hydrogen and helium. With a helium-burning core, the remaining hydrogen envelopes the surface area into a red giant.

Sources:
Greenwood, N. N., & Earnshaw, A. (n.d.). Chemistry of the Elements Second Edition 1. Origins of the Elements. Isotopes and Atomic Weights. Retrieved September 28, 2015, from https://books.google.com/books?id=EvTI-ouH3SsC&pg=PA6&lpg=PA6&dq=antares+star+chemical+compounds&source=bl&ots=pO7WSJhsI7&sig=Fj1M882EqOMGCTJsWMCiNb7Itts&hl=en&sa=X&ved=0CDYQ6AEwA2oVChMIkc3U9J-byAIVg48NCh2cEw8P#v=onepage&q=antares%20star%20chemical%20compounds&f=false

Wikipedia, the free encyclopedia. (2015, September 19). Retrieved September 28, 2015, from https://en.wikipedia.org/wiki/Antares

Visible Spectra of the Elements. (n.d.). Retrieved September 28, 2015, from http://www.umop.net/spctelem.htm