Astronomia:Gigante Vermelha se transformando em supernova? Ou era um quasar?

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http://arxiv.org/PS_cache/arxiv/pdf/1011/1011.5494v1.pdf

The Disappearance of the Red Supergiant Progenitor
of Supernova 2008bk
Massive stars end their lives in spectacular supernova explosions. Identifying
the progenitor star is a test of stellar evolution and explosion models. Here
we show that the progenitor star of the supernova SN 2008bk has now disappeared,
which provides conclusive evidence that this was the death of a red
supergiant star.

Seppo Mattila,1
,
2 Stephen Smartt,3 Justyn Maund,4
,
5 Stefano Benetti,6
Mattias Ergon1
1Department of Astronomy, Stockholm University, Oscar Klein Centre, AlbaNova,
SE-10691 Stockholm, Sweden.
2Tuorla Observatory, Department of Physics & Astronomy, University of Turku,
V¨ais¨al¨antie 20, FI-21500 Piikki¨o, Finland.
3Astrophysics Research Centre, School of Mathematics and Physics,
Queen’s University Belfast, Belfast BT7 1NN, UK.
4Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen,
Juliane Maries Vej, DK-2100 Copenhagen, Denmark.
5Sophie & Tycho Brahe Fellow.
6INAF Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5,
I-35122 Padova, Italy.

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