Imaging Circumstellar Nebulae around Luminous Blue Variables in the Magellanic Clouds

Details Imaging Circumstellar Nebulae around Luminous Blue Variables in the Magellanic Clouds Imaging Circumstellar Nebulae around Luminous Blue Variables in the Magellanic Clouds

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6540s&link_type=abstract

HST Proposal ID #6540

Physics

Hst Proposal Id #6540 Hot Stars

Scientific paper

We propose to exploit the unique spatial resolution of the Planetary Camera to image circumstellar ejecta of hot and luminous stars in the Magellanic Clouds {MCs}, where ground- based imaging of new, spectroscopically discovered nebulae is difficult and cannot provide meaningful spatial information. The objectives are to study the distribution of the ionized gas and dust in order to determine the morphology and physical properties of the circumstellar nebulae, by observing them in a narrow, line-free V continuum filter and in the HAlpha emission line. These data will provide information about the mass-loss history of the central stars, important for understanding the evolution of massive stars and of the interstellar medium of their host galaxies. Two aspects of this proposal are of particular significance: the study of the nebular morphology, to provide input to hydrodynamic models now becoming available, and the determination of the total mass ejected, which can now be predicted with the latest theoretical models of massive-star evolution. This promises to supply us with a much better knowledge of the statistical properties of LBV nebulae, which is needed to test evolutionary models. There is a larger number of LBVs and candidates known in the MCs than in the Galaxy, and only HST is capable to provide sufficent spatial resolution to study them.

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