Questions tagged [spectroscopy]
Questions about the measurement of light waves whereby the wavelength is classified by its position in the electromagnetic spectrum.
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Solar visible light spectrum
So the visible light from stars can be used to identify the elements in that star by looking at the spectral emission lines and comparing those lines to emission lines of various elements (and their ...
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How long would it take to collect a certain amount of photons? [closed]
So, I've received this question to solve, it's not a very advanced one, though advanced enough to cause headaches.
The situation is as follows:
Say, you are observing with a telescope with an ...
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Integral Field Spectroscopy vs Fabry-Perot Interferometry
Why are Fabry-Perot Interferometers (FPIs) and Fourier Transform Spectrographs (FTSs less common than Integral Field Spectrographs (IFS) nowadays? My understanding is that:
With FPIs and FTSs you ...
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What forces expelled these huge clouds, then blocked further progress, yet allowed it to maintain its threads?
From Wikipedia and NASA:
Caption: NASA: S74-15583
(July 1973) --- A huge solar eruption can be seen in this Spectroheliogram obtained during the Skylab 3 mission by the Extreme Ultraviolet ...
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How do elements with only one shell emit light? [closed]
Electrons move to higher energy levels and drop back (electron migration). When they drop levels, photons are emitted and the wavelength/frequency emitted is based on how many levels are dropped. My ...
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How to convert theoretical template spectrum from luminosity density to flux density units?
I'm working with galaxy spectral templates (e.g., Bruzual & Charlot 2003) which seem to always come with y-axis units of $L_{\odot}$/A and x-axis units of Angstroms. Thus the y-axis is a ...
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Can some stars not emit any energy in the visible spectrum?
Stars convert mass into energy. Even converting the slightest mass into energy is immense because the speed of light is so great and $E = mc^2$. This means that stars have to emit large amounts of ...
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Was the discovery of six exoplanets around one star as "easy" as counting six peaks in the FT?
The phys.org article Scientists make huge dataset of nearby stars available to public describes the release of a publicly accessible database of Echelle radial velocity measurements; The LCES HIRES/...
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Why do different instrumental filters use different magnitude systems (Vega vs AB)?
Suppose I wanted to construct the spectral energy distribution (SED) of an object. Further suppose I observe this object through the 9 broad-band filters using the Subaru Suprimecam (just for an ...
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How does glass affect taking solar spectra?
In this case I'm using a CCD camera mounted telescope pointed at the clouds to take solar spectra and was wondering how the telescope being pointed at the clouds through a double gazing (two layer) ...
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Are blue and red shift visible?
When looking into the sky at night using my bare eyes, I see that stars appear in different colors. From my understanding this is caused by different chemical compositions of those stars which show up ...
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wavelength-based IFU data cubes VS velocity-based IFU data cubes
I have 2 simulated IFU data cubes of the same observation, let's say A and B. The 3rd dimension of cube A is in wavelengths. In order to create cube B I just rebinned cube A in log-wavelengths and ...
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Have we Observed Continuum Emission from Neutron Stars?
Have we detected continuum optical emission from any rotating neutron stars that do not have an accretion disk dominating the light? I ask because I know we have observed Doppler broadening of ...
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What's the differences between one-dimensional spectrum and two-dimensional spectrum?
mostly, we use the one-dimensional spectrum. But sometimes we use two-dimensional spectrum, what's the differences between them?
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What's the slit and slot on EIS(EUV Imaging Spectrometer) instrument of Hinode?
There are two slits and two slots on EIS, are they just four types of grating?
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