The Extraordinary Eclipsing Nucleus of the Planetary Nebula SuWt 2

Details The Extraordinary Eclipsing Nucleus of the Planetary Nebula SuWt 2 The Extraordinary Eclipsing Nucleus of the Planetary Nebula SuWt 2

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop..150b&link_type=abstract

NOAO Proposal ID #2001A-0150

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Scientific paper

We propose spectroscopic and photometric observations of the bizarre nucleus of the planetary nebula SuWt 2. Previous CTIO observations have shown the central star to be an eclipsing binary with a period of 4.9 days, surrounded by a remarkable elliptical nebular ring. Very recent AAT spectra have revealed that the nucleus is a double- lined spectroscopic binary, consisting of two A-type stars. Given the absence of any ionizing star, we surmise that one of the A stars is the true central star, caught at the beginning of a ``born- again'' helium shell pulse. We will use the 1.5-m to obtain spectra and radial velocities which, combined with analysis of the light curve, will yield dynamical masses for both stars. We will also use the 0.9-m to obtain detailed coverage of the eclipses and to search for the predicted secular expansion of the born-again component. As time permits, we will also obtain spectra and photometry of other binary nuclei of planetary nebulae.

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