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

Par Conseil national de recherches du Canada

DOITrouver le DOI : https://doi.org/10.1088/0004-637X/734/1/25
AuteurRechercher : ; Rechercher : ; Rechercher : 1; Rechercher : 1; Rechercher : 1; Rechercher :
Affiliation
  1. Conseil national de recherches du Canada. Institut Herzberg d'astrophysique du CNRC
FormatTexte, Article
Sujetbinaries: general; binaries: spectroscopic, circumstellar matter; planetary nebulae: general; stars: AGB and post-AGB; stars: mass-loss
Résumé
The 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in two observing intervals, 1991-1995 and 2007-2010, and we have included in our analysis some additional published and unpublished data.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.
Date de publication
Maison d’éditionAmerican Astronomical Society
IOP Publishing
Dans
  • The Astrophysical Journal 734, nº 1, 25 : 1–14.
Langueanglais
Publications évaluées par des pairsOui
Numéro NPARC19739562
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Identificateur de l’enregistrement0a52275e-9a71-4b48-9e5d-17d9f8434bc4
Enregistrement créé2012-03-29
Enregistrement modifié2020-04-21
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