Castor

Castor is a star group of six stars. Castor A, B, and C are all spectroscopic doubles. A and B orbits around each other and C revolves around A and B. Castor is the second brightest star in the Gemini constellation and the 23rd star in the sky.





Location: Castor A (RA 105° 34' 58.86" | Dec 31° 53' 17.79"), Castor B (RA 105° 34' 59.1" | Dec 31° 53' 18.57"), Castor C (RA 105° 34' 37.58" | Dec 31° 53' 17.82")

Stellar Classification: Castor A: Main-Sequence, Spectral type A1; Castor B: Main-Sequence, Structural type A5; Castor C: Dwarfs, Spectral type M1

Chemical Makeup: Abundances of Hydrogen and Helium, traces of Sc, Ti, V, Cr, Mn, Fe, Co,

Spectrum Analysis: 

Sources:

http://astropixels.com/stars/Castor-01.html

http://www.cuckney.pwp.blueyonder.co.uk/astronmy/ObservationsStarSpectroscope.htm

http://stars.astro.illinois.edu/sow/castor.html

Struve, O., & Kilby, R. (1953). A New Determination of the Spectrographic Orbit of Capella. ApJ ApJL The Astrophysical Journal, 117, 272-272. doi:10.1086/145691