Sky background

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#577973
Alun Halsey
Participant

Hi David,

     Thank you for your reply.

     No, I have left the data of NGC2903 as is,I will return to it and do a subtraction. You are right though the much stronger lines are from my sky background and I used the sodium D (5896A) to match up with the sodium in the A class star,or am I wrong in doing this?  I feel a lot happier now though that I have got the calibration nearly right if there is indeed a redshift 🙂

   Regards

       Alun