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ASTRO: HH 389 and GN 20.59.5.01



 
 
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  #1  
Old May 10th 14, 07:06 AM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
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Posts: 3,085
Default ASTRO: HH 389 and GN 20.59.5.01

This interesting field in Cygnus just under 6 degrees due north of the
North American Nebula. I've centered on the variable star V1331 Cyg. It
harbors HH389 and lights up the reflection nebula around it GN
20.59.5.01 forming an arc around the variable star. SIMBAD notes that
while some consider the star an FU Orionis class star they say this is
unlikely though it is a young stellar object so likely a star just
coming onto the main sequence. It has a G5 spectrum so a bit redder
than our sun. The reflection nebula is the dust left from the creation
of the star that's lit by the star it created. As such it takes on
pretty much the color of the illuminating star. Radiation pressure from
the star likely created the arc as it pushed away the dusty cocoon of
its birth. The star seems out of center indicating this dust may be
piling up at a shock front as it moves through the very dusty
interstellar medium in this part of the galaxy. I found no papers on
this so am just speculating here.

The dark nebula complex running southwest (down and right) from the star
is LDN 981. It appears something like a trident with an overly long
central prong. The dark nebula in the lower left corner is LDN 984.
Most of it is out of my frame. A bright star is out of the frame to the
left center. It cast a very nasty set of bright streaks onto the image.
I thought it far enough away not to be a problem. My crude attempts
to process out the streaks may have done more damage than leaving the
streaks in.

One paper puts the entire complex of the star, emission and dark nebula
at a distance of 0.8kpc which is 2,600 light-years.
http://cdsads.u-strasbg.fr/cgi-bin/n...osetcook ie=1

14" LX200R @ f/10, L=4x10' RGB=2x10', STL-11000XM, Paramount ME

Rick
--
Prefix is correct. Domain is arvig dot net

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  #2  
Old May 12th 14, 07:44 PM posted to alt.binaries.pictures.astro
Stefan Lilge
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Posts: 2,269
Default ASTRO: HH 389 and GN 20.59.5.01

Mighty image Rick.
The dark lane looks like a hand to me, touching a pearl.
Went straight to my list, let's see if I manage to find it.

Stefan


"Rick Johnson" schrieb im Newsbeitrag
...

This interesting field in Cygnus just under 6 degrees due north of the
North American Nebula. I've centered on the variable star V1331 Cyg. It
harbors HH389 and lights up the reflection nebula around it GN
20.59.5.01 forming an arc around the variable star. SIMBAD notes that
while some consider the star an FU Orionis class star they say this is
unlikely though it is a young stellar object so likely a star just
coming onto the main sequence. It has a G5 spectrum so a bit redder
than our sun. The reflection nebula is the dust left from the creation
of the star that's lit by the star it created. As such it takes on
pretty much the color of the illuminating star. Radiation pressure from
the star likely created the arc as it pushed away the dusty cocoon of
its birth. The star seems out of center indicating this dust may be
piling up at a shock front as it moves through the very dusty
interstellar medium in this part of the galaxy. I found no papers on
this so am just speculating here.

The dark nebula complex running southwest (down and right) from the star
is LDN 981. It appears something like a trident with an overly long
central prong. The dark nebula in the lower left corner is LDN 984.
Most of it is out of my frame. A bright star is out of the frame to the
left center. It cast a very nasty set of bright streaks onto the image.
I thought it far enough away not to be a problem. My crude attempts
to process out the streaks may have done more damage than leaving the
streaks in.

One paper puts the entire complex of the star, emission and dark nebula
at a distance of 0.8kpc which is 2,600 light-years.
http://cdsads.u-strasbg.fr/cgi-bin/n...osetcook ie=1

14" LX200R @ f/10, L=4x10' RGB=2x10', STL-11000XM, Paramount ME

Rick
--
Prefix is correct. Domain is arvig dot net

 




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