# Tag Info

1 vote

### Stellar classification spectral lines: chemical abundance vs temperature

Both explanations are right. The strength of an absorption line does depend on the abundance of a chemical element in the photosphere. But it also does depend on the temperature of the photosphere. ...
• 129k

### How to do logarithmic wavelength binning (in Python) in order to find redshift?

I know you probably want to do and understand it yourself - Brian's answer is fine in that regard - but sometimes why reinvent the wheel? This is a standard task implemented in the specutils python ...
• 129k

### How to remove redshift from galaxy spectra in Python?

Yes, there are two ways (at least). Do a pixel by pixel cross-correlation of the galaxy and template spectrum. The cross-correlation function will have a broad peak, and the position of the peak is ...
• 129k

### Stellar classification spectral lines: chemical abundance vs temperature

It's in a state of superposition coherence which means both Luminosity is proportional to the temperature (which is technically ionization) via the stefan-boltzmann law. So the temperature also ...
• 687
Accepted

### What causes the Balmer Jump?

The Balmer break comes from a combination of two main things: the ability of photons with high enough energies (wavelengths shorter than 364.5 nm) to ionize hydrogen atoms that are in the $n = 2$ ...
• 15.1k

### What causes the Balmer Jump?

I don't quite understand your plot (does "grey" mean "blackbody"?), but I think you've stated what's going on pretty clearly (I'm reading Fundamental Astronomy by Karttumen et al ...
• 255
Accepted

### How do amateur astronomers do stellar spectroscopy?

Ad 1) There are multiple options: A diffraction grating in transmission like the StarAnalyzer 100 or 200, that are conveniently framed in a 1.25“ ring, so it can be attached to a standard ocular. A ...
• 329
1 vote

### Reduced chi square value

Should I expect a decrease in the reduced chi-square values with increasing n? You should see a decrease up to the point where you start overfitting -- assuming that your assumption that the correct ...
• 31.4k