Nova Aql'99[2] in colour !
my homepage...
main spectroscopy page
Nova Aql'99[2] in colour !
my homepage...
main spectroscopy page
A reflective grating, large OG prism before a telescope and a small spectroscope at the telescope focal plane [mimicking the OG prism] were used for the following images captured with the Starlight Xpress single-shot colour CCD - either SX-c and MX-c. Note the smooth transition of the primary colours via these cameras - an effect difficult to achieve via tricolour filtration on a mono CCD or via colour film. More one-shot colour images are on my homepages.........
This reworked Beta Lyrae spectrum via OG prism and 26cm f/4 reflector, retains the colours within the hydrogen and helium emission lines but shows greater detail in the grey-scaled [centre] version.
The spectrum of the sun uses the reflection off a chromium plated eyepiece to act as a reflective 'slit' feeding a narrow sample of sunlight into a regular camera lens attached to a colour CCD camera. A reflective grating [600 lines/mm] before the camera lens breaks the sunlight into the various colours and shows the dark absorption lines caused by various elements in the sun's atmosphere some of which are marked.
These spectra - a faint 'planetary nebula' with emission lines and the bright star Altair - were taken with a large 23cm diam OG prism before the dedicated CCD telescope - see 'wpo overview'. When viewed visually through a telescope [without a spectroscope] only the brightly ionised oxygen lines [OIII] in this nebula registers on the retina giving it a greenish-blue appearance. Both Altair and the nebula have common hydrogen lines as marked.
