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kaboom - expansion of the crab nebula

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19 years 8 months ago #5188 by albertw
kaboom - expansion of the crab nebula was created by albertw
Hi,

Came across a couple of images of the crab nebula, taken with a similar filter (I need to research that more), but 40 years apart, 1951 (POSS I) and 1991 (POSS II).

I used a morphing program to simulate the expansion of the nebula over this time. While both images are allegedly of the same are and size the stars on the left do move, exagerrating the expansion on that side. You can also make out what I assume is the proper motion of a star in the top right corner.

www.irishastronomy.org/user_resources/fi...1097987164-crab2.swf 700kb. Sorry thats the smallest format i could do it in.

Next to work out the expansion rate.

Cheers,
~Al

p.s. I anyone knows of a good (preferably free) morphing program please let me know. I'm using shareware at the moment, but all only allow a morph of 2 images.

Albert White MSc FRAS
Chairperson, International Dark Sky Association - Irish Section
www.darksky.ie/

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19 years 8 months ago #5189 by markdj
Replied by markdj on topic Re: kaboom - expansion of the crab nebula
Why does that star move and all the others don't? surely if it was motion of a star then all the others would be moving? could it be something else?

Also, in the lower left of the image there is a long streak coming from a star?

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19 years 8 months ago #5190 by stepryan
Replied by stepryan on topic Re: kaboom - expansion of the crab nebula

Why does that star move and all the others don't? surely if it was motion of a star then all the others would be moving? could it be something else?

Also, in the lower left of the image there is a long streak coming from a star?


i think most of them are moving a small amount, if you look in the bottom left it seems more pronounced as you can see one star pass another. maybe the one in the top right is in the local neightbourhood whereas the others are farther away.
stephen.

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19 years 8 months ago #5191 by voyager
Replied by voyager on topic Re: kaboom - expansion of the crab nebula
Very cool "picture" Al!

My Home Page - www.bartbusschots.ie

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19 years 8 months ago #5192 by Seanie_Morris
Replied by Seanie_Morris on topic V838 Monoceros
Its pretty neat actually! To see the difference over time.

1 thing I would comment on that swiff movie is that all the stars seem to move in/out of allignment from the center of the picture. Seems to indicate that while the Crab Nebula has expanded over time, the second picture had a slightly larger magnification than the earlier picture - thus pronouncing the expansion that bit extra.

A cool set of pictures that sticks in my memory is of the star V838 in Monoceros. Hubble caught a few pictures of it showing how its light echo expanded over a period of just a few months in 2002!

V838 Monoceros

Its pretty amazing to see something so big expand so fast in such a short space of time!


Seanie.

Midlands Astronomy Club.
Radio Presenter (Midlands 103), Space Enthusiast, Astronomy Outreach Co-ordinator.
Former IFAS Chairperson and Secretary.

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19 years 8 months ago #5193 by michaeloconnell
Replied by michaeloconnell on topic Re: kaboom - expansion of the crab nebula
Very cool stuff there Al ! 8)

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