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The Bizarre Central Star of SuWt2

Published online by Cambridge University Press:  26 May 2016

Katrina Exter ,
Howard Bond ,
Don Pollacco  and
Philip Dufton
Katrina Exter
Affiliation:
1APS Division, Dept of Pure and Applied Physics, Queens University Belfast, Belfast, BT7 1NN, UK
Howard Bond
Affiliation:
2STScI, 3700 San Martin Drive, Johns Hopkins University Homewood Campus, Baltimore, MD 21218 USA
Don Pollacco
Affiliation:
1APS Division, Dept of Pure and Applied Physics, Queens University Belfast, Belfast, BT7 1NN, UK
Philip Dufton
Affiliation:
1APS Division, Dept of Pure and Applied Physics, Queens University Belfast, Belfast, BT7 1NN, UK

Abstract

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SuWt2 has been found to contain a double lined and eclipsing binary system. Surprisingly, both components appear to be A-type stars with masses of about 3 M⊙ moving in essentially circular orbits with a period of 4.9 days. We see no indications of a hotter component in the optical or IUE spectra. We discuss the possibility that this is a triple system.

Deep Hα + [N II] images show the nebula to be an inclined ring (≃600 to the line of sight) while spectra show anomalous line ratios (eg I([N II] 6584) ≥≥ I(Hα)) which maybe indicative of recombination in a changing radiation field. Further modeling is ongoing.

Type
Part IV: Central Stars and their Atmospheres
Information
Symposium - International Astronomical Union , Volume 209: Planetary Nebulae: Their Evolution and Role in the Universe , 2003 , pp. 234
Copyright
Copyright © Astronomical Society of the Pacific 2003