View Single Post
  #1  
Old 10-09-2015, 02:30 PM
Placidus (Mike and Trish)
Narrowing the band

Placidus is offline
 
Join Date: Mar 2011
Location: Euchareena, NSW
Posts: 3,719
Yoda with 19 hours H-alpha

There are at least 12 Herbig-Haro objects, studded along two separate jets, in the region of Yoda's Walking Stick in Corona Australis.

See here for a learned ESO article with many diagrams.

A magnificent shot of just part of the region of interest from the ESO La Silla 8.2 metre scope is here.

Really wanting to see these, grit free, we added 19 hours of 3nM H-alpha to our existing colour shot (4.5hrs L, 2.5 hrs each RGB).

Adding the H-alpha as luminance was counter-productive, because it tends to exclude the wonderful blue reflection nebulosity and any OIII emission.

Consequently we added it in as red, with equal weighting to the rest of the red channel. We can now see most of the dozen or so labelled objects in the ESO article as intense red splotches or streaks.

Full size original image here.
Attached Thumbnails
Click for full-size image (Ha (red) 19hrs + (L4hrs30 RGB 2hrs30 each) Thumbnail.jpg)
194.2 KB86 views
Reply With Quote