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Flux calibrated spectrum: AG Dra


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About this observation
Kevin Gurney
Time of observation
01/06/2020 - 00:30
AG Dra
Observing location
Celestron C11, Alpy 600
RVO 80mm refractor, Baader V filter
Atik 460EX (spectroscopy)
ZWO ASI 1600mono (photom)
Fornax 102 mount
spectrocopy - 10x300s subs; photometry - 10x10s observations

My first attempt at flux calibration of a low res spectrum (following
the method of David Boyd). The V-filter magnitude (9.7) used to do this was
from my own observation.  As a kind of cross check, I convolved the
flux calibrated spectrum with a 'Bessel' type B-filter transfer
function and obtained a B-mag of 11.2. I think this compares reasonably
well with AAVSO data that seem bounded between 10.9 and
11.16 for about the same time period as my observation. I tried to use
a Johnson-V transfer function (Baader, like my V-filter) but
this required signal in the spectrum at blue wavelengths I didn't
reliably have  (It seems to have a wider spread than the Bessel).

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