Hi, Bob Erdmann has abandoned the site - the last step in a sad story! Harold Corwin tries to contact him, but there is not much hope that BE will ever be...
I have a question regarding the intensity ratio H alpha/H beta lines for emission nebula. As far as I understand, the theoretical value should be around 3. Are...
Owen, Christopher, Wolfgang, and all - The Internet Archive keeps copies of essentially all publically accessible websites (back to about 1996) in their...
Brent, Surely, a great way to get at previous verisons of web content (use it all the time), but I'm a little more concerned about the man behind the site...
To become a bit more specific: My intention behind this question is to find out whether H alpha intensities are a good indicator for the visibility of an...
here's a bit on the topic including a spectrogram of a typical nebula http://www.narrowbandimaging.com/synthetic_rgb_page.htm really you should be seeking...
Hi Richard, thanks for your answer! I had the information about the H alpha to H beta 3:1 ratio from the same WHAM page, to which you also have a link on your...
Hi Rainer, the transition probabilities for H alpha and H beta are given by the Einstein coefficients of the energy levels which (at least of my knowledge) are...
for completely ionized Hydrogen the 2.92:1 ratio is what amounts to the quantum mechanical probabilities of the various shell transitions. the transition that...
In fact, a different possibility to find out whether OIII or H-beta emission dominates could be to compare the individual filaments on red and blue DSS 2...
I have done an extended visual survey of emission nebulae with various filters: http://www.prairieastronomyclub.org/filtercomparisons.htm It does yet not have...
David W. Knisely
KA0CZC@...
Feb 3, 2009 5:16 pm
21901
Adding to David's excellent list: if there is significant Halpha there will be significant Hbeta. If there's little [OIII] but plenty of Halpha, then Hbeta...
Hey Richard, do you own one of those Custom Scientific H-beta filter ? Could be a fun project for the second half of winter to do the Simeiz with that one and...
I have both a 3nm Cust Sci Hbeta filter and a Lumicon Hbeta that is a bit wider: maybe 12nm I have been moving my home and shop since mid October and am happy...
I recently purchased star-charting software that has an error, mislabeling an object as Ced 71 that I know is really something else. So I started investigating...
A couple of items to notice. First, the position you quote from the Cederblad catalogue is for equinox 1900 and also has a Dec-sign error (in the on-line...
Brian Skiff
bas@...
Feb 3, 2009 10:29 pm
21907
Brian Skiff wrote; ... ************* Thanks so much, Brian, this is just what I expected. So, how come it took you maybe 5 minutes to resolve all of this, and ...
... Cuz I do this sort of thing _a_lot_, and know what sorts of goofs can show up in the catalogues. The poor folks at SIMBAD probably dread the many...
Brian Skiff
bas@...
Feb 3, 2009 10:52 pm
21909
Hi, all I'm looking for coordinates of various DSO, for my web pages. Every object is supposed to have its page, with infobox. I need some data so I can feed...
For most of the van den Bergh reflection nebulae, it is reasonable enough simply to adopt the position of the illuminating star. Look them up in SIMBAD and...
Brian Skiff
bas@...
Feb 4, 2009 7:50 am
21911
Hi Ante, Yes, really there is little or nothing of information in the Web. You know this page? http://galaxymap.org/ With Enzo De Bernardini we make this...
Hi, Thanks Brian and Rudolfo, I do know about galaxymap.org and some other usefull pages, but the problem is that I need *a lot* of data and I have no other ...
Matthias, thanks for the the paper. That is precisely what I was looking for. According to their spectra, Sim147 has relatively strong OIII emission, which...
Pretty sure you just missed one this past Monday morning at about 0600 UT. You have about a four hour window to catch it. Sorry, don't know about the rest of...
Thanks Grant. Yes, I would see the Lunar-X this month but could not find the moment. I hope to have more data for coming months. Best regards, Enzo. __ Buenos...
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