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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > absorption line > Fraunhofer line > HK lines > Ca K line

Ca K line
subject			fact

Ca K line	has wavelength 3933 Å
	has definition A spectral line of singly ionized calcium.
	is a kind of HK lines
HK lines	has species Ca II
Fraunhofer line	has dicovery date 1814
	has discoverer Joseph Fraunhofer
	occurs in Sun
absorption line	has antonym emission line
spectral line	has transition
	has equivalent width
spectral feature	has width
radiation measurement	has unit radiation unit
number	has value