SPECTROSCOPY

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This topic contains 4 replies, has 3 voices, and was last updated by Kevin Worvill Kevin Worvill 5 years, 1 month ago.

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  • #1572
    Kevin Worvill
    Kevin Worvill
    Participant

    A spectrum of Vega recorded 4/12/2013 from Chipping Norton Airfield.
    Look – no telescope! Cannon 400D + Leica R 90mm f2.8 + StarAnalyser 100 grating
    A single shot 0.5 secs at about f4 ( grating filter stop ) and ISO 800
    The graphical image is from processing with IRIS + VSPEC software.
    Dark blue line is the recorded data
    Red line is from a library of “standard” spectra – in this case an A0V class star.
    Light blue peaks indicate element transitions – hydrogen only selected and show from the left hydrogen gamma (434.0 nm) , beta (486.1 nm) and alpha (656.2 nm).
    I guess a modified camera-filter would improve things at the red end.

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    #1576
    melgigg
    melgigg
    Participant

    I’m intrigued Kevin, shooting with a 90mm lens you must have captured multiple stars in your image, have you just selected Vega?

    #1579
    Kevin Worvill
    Kevin Worvill
    Participant

    Yes Mel just Vega selected – you don’t need many pixels for this game!
    With well separated bright stars and short exposures it works ok – anything closer can cause an overlap of the dispersions which is then impossible to untangle.
    I’ll try a busy star field for a demo next time.

    #1581
    Astrosurf
    Astrosurf
    Participant

    This is fascinating. I’d like a go at this myself. My dad, who was one of the founders of the OU (the Faculty of Technology was his idea), got hold of an old spectrograph (a little black tube) so I’ve been fascinated by spectra since I was a little girl. I don’t know very much about them though!

    #1624
    Kevin Worvill
    Kevin Worvill
    Participant

    A good place to start is “Grating spectroscopes and how to use them”
    by Ken Harrison published by Springer 2013. About £30 on Amazon I think.

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