Imaging the Circumstellar Environments of the Cool Hypergiants

Details Imaging the Circumstellar Environments of the Cool Hypergiants Imaging the Circumstellar Environments of the Cool Hypergiants

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8099h&link_type=abstract

HST Proposal ID #8099

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Hst Proposal Id #8099 Stellar Ejecta

Scientific paper

The cool hypergiants are evolved massive stars that lie just below the empirical upper luminosity boundary in the HR Diagram, with spectral types ranging from late A to M. Our recent observations of two of these stars have yielded surprising results about their circumstellar environments including evidence for bi-polarity, equatorial disks, and multiple high mass loss events. To fully understand their mass loss histories, we need to sample these stars at a variety of stages during their brief evolution as cool hypergiants. We propose high resolution imaging of 8 of the most luminous known cool stars. The presence or lack of fossil shells, equatorial ejecta, jets and other structures in their circumstellar environments will be a record of their current and prior mass loss episodes. Each star has been selected on the basis of its infrared emission, strong molecular emission, or peculiar spectroscopic variations to give us a snapshot of different steps in their evolution across the top of the HR Diagram.

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