Supernova 1999bw in Barred Spiral Galaxy NGC 3198

Supernova 1999bw in NGC 3198

The following is the data on Supernova 1999bw:

Discovered: April 20th, 1999, by the Lick Observatory Supernova Search team.

From IAU Bulletin 7152 (4/25/99):

A. V. Filippenko, W. D. Li, and M. Modjaz... write: "A CCD spectrum ...... obtained on Apr. 24 with the 3-m Shane reflector at Lick Observatory looks very similar to that of the type-IIn SN 1997bs in NGC 3627 (M-66). Another example of an object having a similar spectrum is SN 1999Z, but it was much more luminous. The type-IIn subclass clearly spans a very broad range of properties, as was already known to some extent (e.g., Filippenko 1997, Ann. Rev. Astron. Astrophys. 35, 309). It remains to be seen whether the explosion mechanism is core collapse in all of these objects; perhaps in some cases the star is not fully destroyed ...

Follow this Link to a NASA Web site on supernovas. It has a very nice animation and a description of what these objects are.

Spiral Galaxy NGC 3198:

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George Normandin, KAS

May 13th, 1999