The morphology and kinematics of nebulae around Luminous Blue Variables.

Details The morphology and kinematics of nebulae around Luminous Blue Variables. The morphology and kinematics of nebulae around Luminous Blue Variables.

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mkna.book.....w&link_type=abstract

The morphology and kinematics of nebulae around Luminous Blue Variables., by Weis, K.. Heidelberg Univ. (Germany). Naturwissens

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During their evolution the most massive stars (>50 Msun) enter an unstable phase and with a strong mass loss (≡10-3Msunyr-1). Stars in this phase are called Luminous Blue Variables (LBVs). The strong mass loss leads to the formation of nebulae around LBVs. In this thesis the analysis of several LBV nebulae reveals that bipolarity in LBV nebulae seems to be a common feature rather than being present only in the nebula around η Car. Kinematic and morphologic studies show that several other nebulae around LBVs show bipolar components. The expansion velocity of the nebula around WRA 751 indicates that it is older. The author proposes that LBV nebulae evolve along an evolutionary sequence, in which the nebula around η Car represents the youngest member, the nebula around WRA 751 is an older, more evolved object. A comparison of the X-ray emission of the nebula around η Car shows a quite different morphology from the optical appearance. Using the kinematic information it was shown that the X-ray emission originates from faster knots which produce shock fronts and emit in the X-ray band. Finally, for the first time a LBV nebula with a major blowout was found, namly around the LMC star S119.

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