The Bizarre Eclipsing Nucleus of the Planetary Nebula SuWt 2

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

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.1308b&link_type=abstract

American Astronomical Society, AAS Meeting #212, #13.08; Bulletin of the American Astronomical Society, Vol. 40, p.530

Astronomy and Astrophysics

Astronomy

2

Scientific paper

The southern planetary nebula (PN) SuWt 2 consists of a bright, nearly edge-on ring, with faint bipolar lobes extending perpendicularly to the ring. A bright star located close to the geometric center of the PN has been found to be an eclipsing binary composed of two nearly identical early A-type stars. There is no evidence in direct images and IUE UV spectra for a hot star in the system, although it is possible that a third star, now faded below detectability due to a high remnant mass, was responsible for ejection of the PN. Extensive photometry and spectroscopy of the 4.9-day binary shows that both stars are larger than main-sequence (MS) stars of their masses, implying that both are evolving off the MS, or conceivably that they are out of thermal equilibrium due to an interaction with the PN wind. Both stars appear to be rotating slower than synchronously with the orbital period. We discuss possible evolutionary scenarios for this bizarre system.

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