Henize 70

[Shiraz (Ray)]

Hi

have been using twilight and a bit of moonlit time to assemble some Ha and a little O3 on Henize 70 in the LMC.
http://www.astrobin.com/full/240670/0/?real=&mod=

Nothing technically special, but the object is interesting, with violent origins and a huge extent (300ly). The red star is an M class variable with a 3200k colour temperature, so the colour is probably about right, if somewhat unusual.

thanks for looking. regards Ray

[multiweb (Marc)]

Another cool shot. Very well defined. I understand this one is quite faint right?

[Shiraz (Ray)]

thanks Marc. yes, it's dim and it also seems to have an inherent fuzziness, which makes it a real pain to process.

[Atmos (Colin)]

Interesting little space bubble Ray, nicely done

[Stevec35 (Steve)]

Looks great to me Ray! It's certainly not an easy object.

Cheers

Steve

[tilbrook@rbe.ne (Justin Tilbrook)]

Great to see Henize 70 imaged Ray!

The first amateur image I remember of this was taken with through Ian Bedfords 30" scope with starlight express camera.
It blew me away when Ian did a basic stretch on the image and Henize 70 popped out.
Must be 10 years ago.

Cheers,

Justin.

[Placidus (Mike and Trish)]

Ray, that is inspiring.

The AAO write-up says it's a nebula around a bunch of WR stars. The APOD write-up says it's carved out by a mix of supernovas and "very hot" stars. Would love to know more about it, and in particular to see how much [SII] it has.

Nice work,
Mike

[Geoff45 (Geoff)]

Nice take on an unusual object. Colour looks good. Well done Ray.

[RickS (Rick)]

Bit of a change of pace for you Ray, but very nicely done.

Cheers,
Rick.

[rustigsmed (Russell)]

interesting object ray and nicely done as usual! plus its always nice to image something in another galaxy!

Russ

[Shiraz (Ray)]

Originally Posted by Atmos

Interesting little space bubble Ray, nicely done

thanks Colin - a few SNs can make a bit of a mess of their surrounds.

Originally Posted by Stevec35

Looks great to me Ray! It's certainly not an easy object.

Cheers

Steve

Thanks Steve. It is a bit difficult, but very interesting.

Originally Posted by tilbrook@rbe.ne

Great to see Henize 70 imaged Ray!

The first amateur image I remember of this was taken with through Ian Bedfords 30" scope with starlight express camera.
It blew me away when Ian did a basic stretch on the image and Henize 70 popped out.
Must be 10 years ago.

Cheers,

Justin.

Thanks Justin. Yes, it is one of those objects that looks slightly unreal.

Originally Posted by Placidus

Ray, that is inspiring.

The AAO write-up says it's a nebula around a bunch of WR stars. The APOD write-up says it's carved out by a mix of supernovas and "very hot" stars. Would love to know more about it, and in particular to see how much [SII] it has.

Nice work,
Mike

thanks very much Mike. I also could not find much that was explanatory.

From the little that I could find (and please correct if any of this is wrong), it seems that a bubble may begin with OB star associations condensing from dense molecular clouds. The OB stars (probably including W-Rs) spew stuff everywhere in massive stellar winds, forming an initial ball of gas and dust. Eventually the highest mass stars become SNs and the supersonic blasts from these sweep up and shock up the previously ejected material and other collected material - they also clear out the central region. This forms the hollow shell structure.

I could find one spectrum from a superbubble and that was almost exclusively Ha. I recorded very little O3 from H70 - it seems to be predominantly an Ha region as well, presumably activated by UV from whatever OBs and hot cinders are left in the central region.

If you find any good info on these things, be very grateful if you would post it - they are fascinating structures.

Originally Posted by Geoff45

Nice take on an unusual object. Colour looks good. Well done Ray.

thanks Geoff. Colour is basically Ha - there was not much else in H70 itself. I suppose that I should have added some Ha to the G and B to simulate Hb, but I didn't think that would add a lot.

Originally Posted by RickS

Bit of a change of pace for you Ray, but very nicely done.

Cheers,
Rick.

Thanks Rick. Yep, way out of my comfort zone, but these things are fascinating and imaging in twilight is a good way to get and extra hour or two of data in a night.

Originally Posted by rustigsmed

interesting object ray and nicely done as usual! plus its always nice to image something in another galaxy!

Russ

Thanks Russ. exactly! how much fun to be able to see a bit of detail in something that far away.

regards Ray

[strongmanmike (Michael)]

What a great utiliser of time you are Razzor! Bloody nice job indeed too with some good detail how bright was the sky and what band width filter are you using?

Mike

[Shiraz (Ray)]

Hi Mike. well I figured that I was wasting an hour or more every night just waiting for the scope to cool, the twilight to go away and the seeing to settle down - wasted time that will never come around again. So I used a 7nm Ha, mainly in twilight and a bit of moonlight over a month or so and got well over 10 hours of very variable data - about half was usable. combined that with about an hour of O3 taken on a clear moon free night and ended up with a "nearly for free" image that is technically mediocre, but of an object of interest . Started imaging as soon as it was dark enough that the guider would work and used 10 minute subs that were short enough that the focus did not vary too much through the exposures.

regards Ray

[suma126 (Shane)]

great image

[Shiraz (Ray)]

Originally Posted by suma126

great image

thank you Shane.

[andyc (Andy)]

Imaging through twilight... cheeky skills there Ray! That's a very nice image of an unusual object

[Paul Haese]

Its an interesting looking object Ray. I like the look of the colour overall. Nice 3D look to the nebula

[gregbradley]

A fabulous image Ray. I like these types of objects. It looks like a SNR.

Greg.

[marco (Marco Lorenzi)]

Yeah, very cool shot indeed! It would be great adding RGB to proper colorize the stars, leaving the details of the Ha/O3 combination on the nebula. Perhaps already planned next LMC season?
Clear skies
Marco

[astronobob (Bob)]

Some mighty interesting activity you've captured there Ray, , This hobby has never-ending surprises for us all
Very nicely done processing and particularly acquisition wise - NB etc