Quote:
Originally Posted by JJDOBBER79
Hi gang,
I just read that the rosette nebula has a large H 2 concentration. Are they referring to hydrogen beta? As in a hbeta filter will help on this target.? I am really just trying to justify buying one. Is the hbeta filter really just a one trick pony? Was that a pun?????.
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The rosette will have Hb emission but that isn't what is meant by H2 or more correctly H II.
This is just astronomer speak for ionised Hydrogen meaning single H atoms that are also ionised rather than H2 which is the form of hydrogen we have commonly on earth.
The level of ionisation determines the emission frequency. As Ken stated, Hb is usually about 50% as strong as Ha.
see
http://en.wikipedia.org/wiki/H_II_region