Other causes of valve disease include: 1  Deposits of calcium (calcification) in parts of the valve. 2  A floppy valve, which is a common cause of mild mitral valve regurgitation. 3  Some congenital heart problems. 4  Infection of the valve (infective endocarditis). 5  A complication of various uncommon diseases.
exists and is an alternate of . Castor is a variable star and also a quadruple star system, and has a spectral class of A1/A2 giving it a colour of white to white blue. Castor is a variable star and also a quadruple star system, and has a spectral class of A1/A2 giving it a colour of white to white blue. See link for more information.  <br /><br /> See link for more information. Castor is a variable star and also a quadruple star system, and has a spectral class of A1/A2 giving it a colour of white to white blue. <br /><br />
Cepheid Variable Stars. Cepheid variables are types of stars that illuminate or brighten and dim with regularity. Its cycle of becoming brilliant to dim and vice-versa is called the period of fluctuation lasts for more or less than fifty days.epheid variables are types of stars that illuminate or brighten and dim with regularity. Its cycle of becoming brilliant to dim and vice-versa is called the period of fluctuation lasts for more or less than fifty days.