Astronomy Spectral Question?

[BigJimbo]

which star will have strong spectral lines from both hydrogen and helium in its spectrum?

our sun G2 on spectrum

sirius A1
rigel kentaurus G2
procyon F5
betelgeuse M2
ross 154 M5

its actually not for me this time but i have searched with no avail any help or pointers into the right area would be great!

 

[BigJimbo]

no one knows this? I posted on a few other forums with no luck I was sure someone here could figure this out

 

[element]

Well sirius is the brightest star in the night sky, magnitude -1.5 (lower is brighter)

 

[Descartes]

Our of the stars you mentioned I am almost certain that Sirius would have the strongest hydrogen and helium lines. The A spectral class is sometimes called a class of hydrogen stars, so it seems to be the most realistic answer. The further down you go (i.e. to M) the less prominent they become.

 

[silverpig]

Sirius.

Hydrogen lines are fairly strong over all spectral types, with the hydrogen lines being most prominent around the A0 mark.

Helium lines are reserved for the higher luminosity stars (OBA), so this leaves only Sirius from the ones you posted.

 

[Pex]

Originally posted by: silverpig
Sirius.

Hydrogen lines are fairly strong over all spectral types, with the hydrogen lines being most prominent around the A0 mark.

Helium lines are reserved for the higher luminosity stars (OBA), so this leaves only Sirius from the ones you posted.

how the hell do you knwo all this?