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===Castor Aa===

===Castor Aa===

The primary star of the Castor A binary pair, '''Castor Aa''', is a main sequence blue-white star of spectral class A1 V, similar to [[Sirius]].  The star is estimated to have a mass 2.15 times that of our [[Sun]], with a radius 2.3 times as great.  The bright, blue-white star has a visual luminosity between 17 and 34 times that of our Sun.  Both Castor Aa and it's companion have a lower [[metallicity]] then our own Sun.<ref name="harv">http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2001A%26A...365L.344G&db_key=AST&high=3c1a46b25823484</ref>  Castor Aa is separated from it's companion Ab by an average distance of only 0.022 AUs, but their [[orbit]] is highly eccentric (e=0.499).  It takes a total of 9.21 days for the two stars to complete an orbit.<ref name="harv1">http://adsbit.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1914ApJ....39..459S&data_type=PDF_HIGH&type=PRINTER&ext=.pdf</ref>

The primary star of the Castor A binary pair, '''Castor Aa''', is a main sequence blue-white star of spectral class A1 V, similar to [[Sirius]].  The star is estimated to have a mass 2.15 times that of our [[Sun]], with a radius 2.3 times as great.  The bright, blue-white star has a visual luminosity between 17 and 34 times that of our Sun.  Both Castor Aa and its companion have a lower [[metallicity]] then our own Sun.<ref name="harv">http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2001A%26A...365L.344G&db_key=AST&high=3c1a46b25823484</ref>  Castor Aa is separated from its companion Ab by an average distance of only 0.022 AUs, but their [[orbit]] is highly eccentric (e=0.499).  It takes a total of 9.21 days for the two stars to complete an orbit.<ref name="harv1">http://adsbit.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1914ApJ....39..459S&data_type=PDF_HIGH&type=PRINTER&ext=.pdf</ref>

===Castor Ab===

===Castor Ab===