Observation by Kevin Gurney: Flux calibrated spectrum: AG Dra

Uploaded by

Kevin Gurney

Observer

Kevin Gurney

Observed

2020 May 31 - 23:30

Uploaded

2020 Jun 28 - 11:16

Objects

Spectrum

Equipment
  • Celestron C11, Alpy 600
  • RVO 80mm refractor, Baader V filter
  • Atik 460EX (spectroscopy)
  • ZWO ASI 1600mono (photom)
  • Fornax 102 mount
Exposure

spectrocopy - 10x300s subs; photometry - 10x10s observations

Location

Sheffield

Target name

AG Dra

Title

Flux calibrated spectrum: AG Dra

About this image

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).

Files associated with this observation
Like this image
Copyright of all images and other observations submitted to the BAA remains with the owner of the work. Reproduction of work by third parties is expressly forbidden without the consent of the copyright holder. By submitting images to this online gallery, you grant the BAA permission to reproduce them in any of our publications.