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Estimating the binary fraction of planetary nebulae central stars

  • D. Douchin (a1) (a2) (a3), O. De Marco (a1) (a2), D. J. Frew (a1) (a2), G. H. Jacoby (a4), J.-C. Passy (a5) (a6), T. Hillwig (a7), S. B. Howell (a8), H. Bond (a9), A. Peyaud (a1), A. Zijlstra (a10), R. Napiwotzki (a11), G. Jasniewicz (a3) and Q. Parker (a1) (a2)...

Abstract

During the past 20 years, the idea that non-spherical planetary nebulae might need a binary or planetary interaction to be shaped was discussed by various authors. It is now generally agreed that the varied morphologies of planetary nebulae cannot be fully explained solely by single star evolution. Observationally, more binary central stars of planetary nebulae have been discovered, opening new possibilities to understand the connections between binarity and morphology. So far, ≃45 binary central stars of planetary nebulae have been detected, most being close systems detected via flux variability. In order to determine the PN binary fraction, one needs a method that can detect wider binaries. We present here recent results concentrating on binary infrared excess observations aimed at detecting binaries of any separation.

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References

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Bond, H. E. 2000, APNII, 199, 115
De Marco, O. 2009, PASP, 121, 316
Frew, D. J. 2008, PhD thesis, Macquarie University, 30, 490
Frew, D. J. & Parker, Q. 2007, APN IV, 68
Jacoby, G. H. et al. 2010, PASA, 27, 156
Miszalski, B. et al. 2009, A&A, 505, 249
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Keywords

Estimating the binary fraction of planetary nebulae central stars

  • D. Douchin (a1) (a2) (a3), O. De Marco (a1) (a2), D. J. Frew (a1) (a2), G. H. Jacoby (a4), J.-C. Passy (a5) (a6), T. Hillwig (a7), S. B. Howell (a8), H. Bond (a9), A. Peyaud (a1), A. Zijlstra (a10), R. Napiwotzki (a11), G. Jasniewicz (a3) and Q. Parker (a1) (a2)...

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