Physics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8395b&link_type=abstract
HST Proposal ID #8395
Physics
Hst Proposal Id #8395 Sakurai S Novalike Object: Real-Time Monitoring Of
Scientific paper
The eruption of Sakurai's novalike variable in Sagittarius presents a "once-in-a-lifetime" opportunity for real-time observations of a star undergoing a final helium thermal pulse. The star rose from obscurity to become an 11th-magnitude, hydrogen-deficient red giant in 1995-96, but it is {possibly} already evolving back to high temperature. During the next few years, it will begin to {re}-ionize its large, faint planetary nebula, and we should be able to witness the reestablishment of a fast stellar wind as the effective temperature increases. We will use STIS to monitor the spectroscopic development of the star in the UV at regular 2-month intervals over the next 3 years. We will also use WFPC2 to check for propagation of a light echo into the surrounding medium by obtaining images twice per year. In combination with ground-based monitoring {optical, IR, and mm}, we will produce the first detailed case study of a thermal pulse. As we are essentially seeing a star retracing its evolution across the HR diagram from the AGB to the planetary-nebula phase, these observations will also aid our understanding of the more general case of post-AGB stellar evolution.
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