Are proto-planetary nebulae shaped by a binary? Results of a long-term radial velocity study

Download
  1. Get@NRC: Are proto-planetary nebulae shaped by a binary? Results of a long-term radial velocity study (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1088/0004-637X/734/1/25
AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titleThe Astrophysical Journal
ISSN0004-637X
Volume734
Issue1
Article number25
Pages25-1–; # of pages: 14
Subjectbinaries: general; binaries: spectroscopic, circumstellar matter; planetary nebulae: general; stars: AGB and post-AGB; stars: mass-loss
AbstractThe shaping of the nebula is currently one of the outstanding unsolved problems in planetary nebula (PN) research. Several mechanisms have been proposed, most of which require a binary companion. However, direct evidence for a binary companion is lacking in most PNs. We have addressed this problem by obtaining precise radial velocities of seven bright proto-planetary nebulae (PPNs), objects in transition from the asymptotic giant branch to the PN phases of stellar evolution. These have F-G spectral types and have the advantage over PNs of having more and sharper spectral lines, leading to better precision. Our observations were made in two observing intervals, 1991-1995 and 2007-2010, and we have included in our analysis some additional published and unpublished data. Only one of the PPNs, IRAS 22272+5435, shows a long-term variation that might tentatively be attributed to a binary companion, with P > 22 yr, and from this, limiting binary parameters are calculated. Selection effects are also discussed. These results set significant restrictions on the range of possible physical and orbital properties of any binary companions: they have periods greater than 25 yr or masses of brown dwarfs or super-Jupiters. While not ruling out the binary hypothesis, it seems fair to say that these results do not support it.
Publication date
PublisherThe American Astronomical Society
LanguageEnglish
AffiliationNational Research Council Canada; NRC Herzberg Institute of Astrophysics
Peer reviewedYes
NPARC number19739562
Export citationExport as RIS
Report a correctionReport a correction
Record identifier0a52275e-9a71-4b48-9e5d-17d9f8434bc4
Record created2012-03-29
Record modified2016-07-18
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)