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Questions tagged [h-alpha]

Questions about the spectral line at 656.28 nm in the Balmer series called H-alpha or H$\alpha$.

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How rare are nebulae which emit H-Beta/H-Gamma/H-Delta? (Balmer series) [duplicate]

Most of the visible light emission nebulae have a lot H-alpha emissions, and because of that appear red. But why are other Balmer emissions much rarer? Do they need a hotter environment which is ...
jack_O'Dim's user avatar
7 votes
2 answers
157 views

When was H-alpha first used to observe the universe?

The H-alpha line is used by astronomers to trace the presence of hydrogen in galaxies or to view protuberances on the Sun. When was the H-alpha emission of astronomical objects such as galaxies first ...
usernumber's user avatar
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1 vote
0 answers
109 views

H alpha - double peak (Be star)

What is the double peak in this case, please? What does the third mean? Many thanks
Elena Greg's user avatar
1 vote
1 answer
418 views

How to isolate H$_\alpha$ from Nitrogen doublet emission lines

I am trying to find out line intensity and FWHM of H$_\alpha$6565 emission line from a quasar spectrum obtained from SDSS DR-14Q. Visual inspection of spectrum shows H$_\alpha$ being contaminated with ...
Adnan Mirza's user avatar
4 votes
1 answer
164 views

Any simple experiment with an H-alpha telescope?

Is there any simple experiment that can be done with an H-alpha telescope, for example to estimate the Sun's mass, size, distance, temperature or intensity? I give lessons about renewable energy and ...
Eric Duminil's user avatar
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2 votes
2 answers
1k views

about H$_\alpha$ and H$_\beta$ lines in astronomical objects' spectra

Generally there may be some line ratio between the two lines. If H$\alpha$ is strong, it is quite possible we can see H$_\beta$ too. Is it possible we can see H$_\beta$, but can not see H$_\alpha$? ...
questionhang's user avatar
  • 3,157
3 votes
0 answers
72 views

H-alpha velocity fields of spirals falling into a cluster

What kind of impact would you expect ram pressure stripping / tidal interactions / harassment / interactions with the cluster potential (etc!) to have on the h-alpha velocity fields of infalling ...
astro person's user avatar