Sakurai's Novalike Object: Real-Time Monitoring of a Stellar Thermal Pulse

Details Sakurai's Novalike Object: Real-Time Monitoring of a Stellar Thermal Pulse Sakurai's Novalike Object: Real-Time Monitoring of a Stellar Thermal Pulse

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10111b&link_type=abstract

HST Proposal ID #10111

Physics

Hst Proposal Id #10111 Hot Stars

Scientific paper

This is a continuation of a program carried out in Cycles 7-10. Sakurai's Object {V4334 Sgr} 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 ``born-again'' hydrogen-deficient red giant in 1995-96, and currently it is undergoing episodes of atmospheric dust formation. If it follows the pattern that the similar object V605 Aql took early in the 20th century, it will soon begin evolving back to high temperature. During the subsequent few years, it will begin to {re}-ionize its large, faint, old planetary nebula as well as the new ejecta, and we should be able to witness the re-establishment and evolution of a fast stellar wind as the effective temperature increases. When the star does begin to heat up, we will initiate Target-of-Opportunity STIS observations to monitor the star's spectroscopic development in the UV at regular intervals, continuing over the next 3 Cycles. We will also use ACS/HRC twice over the next 3 years to continue our monitoring of the expansion of the ejecta and to determine the star's proper motion. In combination with ground-based monitoring {optical, IR, and mm}, we will thus produce the first detailed case study of a thermal pulse, as the star re-traces its evolution across the HR diagram from the AGB back to the hot planetary-nebula-nucleus phase.

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