Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20915012s&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #150.12; Bulletin of the American Astronomical Society,
Other
Scientific paper
I discuss two recently discovered ring nebulae around hot massive stars in our galaxy, where the ring nebulae are nearly identical to that around SN1987A. One is a triple-ring nebula around the luminous blue variable (LBV) candidate HD168625, where an equatorial ring was previously known, but a larger bipolar ringed nebula has now been discovered in Spitzer images. The second object is a previously uncataloged B1.5 supergiant seen projected in the Carina Nebula, which is surrounded by a thin equatorial ring that is identical to SN1987A's. Including the previously known nebula around Sher25 in NGC3603, there are now three examples of circumstellar nebulae in our galaxy that are close analogs of the nebula around SN1987A, and all three of them are around blue supergiants. In the two cases where the stars have been studied in detail (Sher25 and HD168625) it is doubtful that the nebulae were formed through the usual paradigm where a fast wind sweeps up a cool red supergiant wind --instead, they were probably ejected in LBV eruptions. The third object in Carina is a new discovery and needs to be studied further. In any case, these three new ring nebulae and other examples around LBVs hint that blue supergiants can eject bipolar nebulae with equatorial rings, without requiring a previously existing slow disk to constrict the outflow. Their similiarity to SN1987A calls into question ideas about the formation of SN1987A's nebula via a fast/slow interacting wind scenario and its previous red supergiant phase. If SN1987A's nebula was also ejected as a blue supergiant, it may have suffered an episodic mass-loss event analogous to LBV explosions, but at somewhat lower luminosity. This would have important consequences for our understanding of stellar evolution at high masses.
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