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Where are the binaries in proto-planetary nebulae? Results of a long-term radial velocity study

Published online by Cambridge University Press:  08 August 2017

Bruce J. Hrivnak ,
Hans Van Winckel ,
Griet Van de Steene ,
David Bohlender ,
Julius Sperauskas  and
Wenxian Lu
Bruce J. Hrivnak
Affiliation:
Valparaiso University, Valparaiso, IN 46383, USA; email: [email protected]
Hans Van Winckel
Affiliation:
Instituut voor Sterrenkunde, K. U. Leuven University, 3001 Leuven (Heverlee)Belgium; email: [email protected]
Griet Van de Steene
Affiliation:
Royal Observatory of Belgium, Ringlaan 3, 1180, Brussels, Belgium; email: [email protected]
David Bohlender
Affiliation:
Dominion Astrophysical Observatory, Herzberg Institute of Astrophysics, 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada; email: [email protected]
Julius Sperauskas
Affiliation:
Vilnius University Observatory, Ciurlionio 29 Vilnius 2009, Lithuania; email: [email protected]
Wenxian Lu
Affiliation:
Valparaiso University, Valparaiso, IN 46383, USA; email: [email protected]
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Abstract

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We present the results of a long-term search (25 yrs) for radial velocity variability in a sample of seven bright proto-planetary nebulae showing axial symmetry. They all vary in velocity due to periodic pulsations. However, only marginal evidence is found for multi-year variations that might be due to a binary companion.

Keywords

binaries: spectroscopic – planetary nebulae: general – stars: AGB and post-AGB
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S323: Planetary Nebulae: Multi-Wavelength Probes of Stellar and Galactic Evolution , October 2016 , pp. 218 - 222
Copyright
Copyright © International Astronomical Union 2017 

References

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