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The procedure that has been adopted for the processing of the data includes the following stages:
- The spectrum of a reference star is obtained.
- The sky is removed from the raw spectral star image.
- The columns perpendiclar to the spectral image are added to obtain the stella spectrum.
These tasks have been performed in IRIS. The sky removal and optimal addition options within IRIS both seem to give excellent results.
The output from IRIS has had the local sky effects removed but is still dependant on the spectral response of the optical system. To calibrate the spectrum we do the following:
- Divide our spectrum by a library spectrum for the same spectral type.
- The resulting curve is smoothed.
- This is then used to calibrate the other spectra... We divide our other spectra by the calibration curve.
These tasks are performed in Visual Spec. The library spectra are supplied as part of that package. These appear to be from the Pickles catalogue and are normalised with to 550nm (V-Band) to equal a relative flux value of 1.
It is clear that errors could be included at each step in the procedure. It would also be very complex to calculate these individual errors. However, the differences between the different spectra of the same star taken over the course of a number of nights would give us a good idea of the overall accuracy of our results.
So.... If we.....
- Take the spectrum of a reference star, process it to obtain a spectral response curve.
- Take the spectrum of another star with a different spectral type, use the response curve to calibrate it.
- Repeat this same procedure a number of times over a number of different nights.
- Compare the data sets and calculate an error value for each wavelength and hopefully a percentage error.
- Convert this to an average error across the B, V & R bands if this is possible.
This could then provide some level of quality assurance for the spectra obtained.
I hope it help you... :)
What else can I help you with?
What does a spectrograph help determine?
The elemental composition of the materiel forming the spectrum.
Scientists determined this was expanding by using the spectrograph?
Scientists determined that the object was expanding by analyzing its light spectrum using a spectrograph. By observing the Doppler shift in the spectral lines, scientists could infer the motion of the object relative to Earth, leading to the conclusion that it was moving away and expanding.
What is the emission spectrograph used for?
An emission spectrograph is used to identify elements present in a sample by measuring the wavelengths of light emitted when the sample is excited. It can be useful in various fields such as chemistry, environmental science, and material science for identifying unknown substances and analyzing their composition.
What is a device that separates the light from stars and other objects according to wavelength in order to produce a spectrum?
A spectrograph is a device that separates light from stars and other objects into its different wavelengths to produce a spectrum. This allows astronomers to study the composition, temperature, and other properties of the object emitting the light through analysis of the spectrum.
What is the difference between Aston's mass spectrograph and Dempster's mass spectrometer?
Aston's mass spectrograph is a magnetic sector mass spectrometer that separates ions based on their mass-to-charge ratio using magnetic and electric fields. Dempster's mass spectrometer is an early design of a mass spectrometer that used electric and magnetic fields to separate ions based on their mass-to-charge ratio. Aston's design was an improvement over Dempster's, offering higher resolution and precision in analyzing isotopic composition.
Why do scientists use a spectrograph?
because they want to
What is a calutron?
An electromagnetic apparatus for separating isotopes of uranium and other elements according to their masses, using the principle of the mass spectrograph. It lost me at 'mass spectrograph'.
An istrument that breaks the light from an object into colors?
A spectrograph can do that.
What is the detector in a spectrograph in which spectral lines are recorded photographically?
The detector in a spectrograph that records spectral lines photographically is a photographic plate or film. This photographic medium captures the light from the spectral lines dispersed by the spectrograph, allowing them to be recorded for analysis and interpretation.
Can a spectrograph tell the age of a star?
Yes, but not to any precision.
What do spectrograph do?
A spectroscope identifies the elements by the color that they give off.
What does a spectrograph help determine?
The elemental composition of the materiel forming the spectrum.
How does a spectrograph provide information about stars chemical composition?
A spectrograph breaks down the light from stars into its component colors or wavelengths. Each chemical element absorbs and emits light at specific wavelengths, creating a unique fingerprint called a spectral line. By analyzing the spectral lines in a star's light, scientists can determine its chemical composition.
What space gadgets is used by astronomers?
telescopes, spectrograph's, screw drivers, and lots of Physics!
What does a spectograph tell us?
A spectrograph tells us which colors (wavelengths of light) are in a luminous source.
Change of color on the spectrograph as objects move toward or away from other objects?
Doppler shift
The spectrum of a star is called a what?
... a photonic 'fingerprint'. The picture of a star's spectral lines is its photo-spectrograph.
