Doppler shift
 

Wavelengths l are in Angstrom.  This CLEA software produces only the purple part of the spectrum since that information is sufficient for the analysis we're doing.  Deep purple is at left (hardly noticeable at all to the human eye), deep blue on the right.
 
 

This intensity graph shows clearly the spectral lines of HD 35215 are shifted towards the red when comparing them to a standard B0 Main Sequence star.

Is this star receding or approaching?
 
 

Doppler shift of spectral standard versus HD 35215.

	standard l	measured l
Ca II (H-line)	3970.4	3969.0
H I (H d)	4102.5	4101.2
H I (H g)	4341.3	4340.4

Determine how fast this star moves by using the formula for the Doppler shift:  v = c (Dl) / (l) .