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Mark72
professor emeritus


Reged: 09/19/12

Loc: Munich, Germany
VDB 136 - rarely imaged yellow nebula new
      #5979569 - 07/19/13 10:36 AM

Somehow I could not find any close up of this object. There are just 2 wide-field images though it's in Cygnus.

May be Rick J could add some info on this target. I guess it's like NGC1555 - T-Tauri class star?

The image looks a bit blurred. This is due to a rather diligent stretch to show the thin film of blueish dust in this region.


http://www.astrobin.com/46786/B/

Thanks for looking!

Mark


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blueman
Photon Catcher
*****

Reged: 07/20/07

Loc: California
Re: VDB 136 - rarely imaged yellow nebula new [Re: Mark72]
      #5979739 - 07/19/13 12:21 PM

Very cool off beat object. There are so many in Cygnus.
Blueman


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Dan Crowson
professor emeritus
*****

Reged: 10/08/10

Loc: O'Fallon, MO
Re: VDB 136 - rarely imaged yellow nebula new [Re: blueman]
      #5979884 - 07/19/13 02:06 PM

Really nice image. I'm going to add that one to my want list.

Note that it is fairly close to B348 so there are a few images on the net.

Dan


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Rick J
Postmaster
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Reged: 03/01/08

Loc: Mantrap Lake, MN
Re: VDB 136 - rarely imaged yellow nebula new [Re: Dan Crowson]
      #5979918 - 07/19/13 02:24 PM

Had to put that one back on the redo list as was a victim of my lousy weather the past 16 months. Haven't researched it as yet. I'll never get 10 hours on it even if the weather cooperates which it shows no indication of doing.

Rick


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Mark72
professor emeritus


Reged: 09/19/12

Loc: Munich, Germany
Re: VDB 136 - rarely imaged yellow nebula [Re: Rick J]
      #5980750 - 07/20/13 12:34 AM

Thanks for your comments!

Mark


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Thomas Davis
Dust Buster


Reged: 04/25/08

Loc: Inkom, ID USA
Re: VDB 136 - rarely imaged yellow nebula new [Re: Mark72]
      #5982282 - 07/21/13 01:02 AM

Here's my "close up".

http://tvdavisastropics.com/astroimages-1_0000c7.htm

-Tom


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Mark72
professor emeritus


Reged: 09/19/12

Loc: Munich, Germany
Re: VDB 136 - rarely imaged yellow nebula new [Re: Thomas Davis]
      #5982372 - 07/21/13 02:23 AM

Yes Tom,

your images are great inspiration for wide-field AP.

Mark


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bill w
Postmaster
*****

Reged: 03/26/05

Loc: southern california
Re: VDB 136 - rarely imaged yellow nebula new [Re: Mark72]
      #5982807 - 07/21/13 11:24 AM

cool shot
so what causes a yellow nebula?
looks very reflection-like
perhaps dust in front, and not behind the star
so that the scattering angles are lower?


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Mark72
professor emeritus


Reged: 09/19/12

Loc: Munich, Germany
Re: VDB 136 - rarely imaged yellow nebula new [Re: bill w]
      #5983022 - 07/21/13 01:31 PM

Thanks Bill,

I guess it's a young sun-like star?

Mark


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Thomas Davis
Dust Buster


Reged: 04/25/08

Loc: Inkom, ID USA
Re: VDB 136 - rarely imaged yellow nebula new [Re: Mark72]
      #5983211 - 07/21/13 03:37 PM

It is yellow for similar reasons to the Antares Nebula. Star type, dust particle size and light angle all contribute. The Antares Nebula (its main components) is the most obvious example of a yellow reflection nebula, but vdB 136 (here presented in glorious form by Mark), vdb 135, vdb 151, and the Toby Jug Nebula are other examples.

Toby Jug:
http://tvdavisastropics.com/astroimages-1_0000be.htm

vdb 135:
http://tvdavisastropics.com/astroimages-1_0000e3.htm

vdb 151 (pale):
http://tvdavisastropics.com/astroimages-1_0000c5.htm


-Tom


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Rick J
Postmaster
*****

Reged: 03/01/08

Loc: Mantrap Lake, MN
Re: VDB 136 - rarely imaged yellow nebula new [Re: Thomas Davis]
      #5983342 - 07/21/13 05:33 PM

It's illuminating star, HD 196819, is listed as K2.5IIb (bright giant luminosity class) so a yellow orange star. We get so used to reflection nebula around blue stars it is easy forget they can be other colors. Of course other factors play in this, is this forward or backward scattering, what's the size distribution of the particles etc.?

Rick


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