Re: supernova rings

Glenn R. Morton (
Sun, 03 May 1998 23:29:32 -0500

At 11:03 PM 5/3/98 -0600, Bill Payne wrote:
>Perhaps. I had assumed that the rings were actually spheres, and we are
>only able to see what is the thickest part of the sphere from our
>vantage point, which would be the part of the sphere of dust that is
>perpendicular to our line of sight at the center of the star. Are you
>saying that the
>outer ring actually is a ring and not a sphere, and that the ring is
>perfectly centered around SN 1987A from our particular vantage point?

The "rings" that are causing the light echos are spheres. They look like
rings because the light reflects off only a small part of the material
along a ring cut through the sphere.


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