AustralieFrV1, Main, Exploration, bibRecord, 008448

Binary planetary nebulae nuclei towards the Galactic bulge I. Sample discovery, period distribution, and binary fraction

Identifieur interne : 008448 ( Main/Exploration ); précédent : 008447; suivant : 008449

Binary planetary nebulae nuclei towards the Galactic bulge I. Sample discovery, period distribution, and binary fraction

Auteurs : B. Miszalski [France, Australie] ; A. Acker [France] ; A. F. J. Moffat [Canada] ; Q. A. Parker [Australie] ; A. Udalski [Pologne]

Source :

Astronomy and astrophysics : (Berlin. Print) [ 0004-6361 ] ; 2009.

RBID : Pascal:09-0168800

Descripteurs français

Pascal (Inist)
- Binaire serrée, Bulbe galactique, Caractéristique photométrique, Etoile centrale, Filament, Ionisation, Jet, Modèle, Morphologie, Nébuleuse planétaire, Bulbe galactique, Cosmogonie planétaire, Binaire serrée, Etoile centrale, Evolution stellaire, Nébuleuse émissive, Photométrie, Microlentille, Modèle, Corrélation, Distribution masse, Rapport masse, Naine blanche, Morphologie, Binaire éclipse, Etoile symbiotique, Voie lactée.

English descriptors

KwdEn :
- Central stars, Close binary stars, Correlations, Eclipsing binary stars, Emission nebulae, Filaments, Galactic bulge, Ionization, Jets, Mass distribution, Mass ratio, Microlenses, Milky Way, Models, Morphology, Photometric characteristic, Photometry, Planetary cosmogony, Planetary nebulae, Stellar evolution, Symbiotic stars, White dwarf stars.

Abstract

Binarity has been hypothesised to play an important, if not ubiquitous, role in the formation of planetary nebulae (PNe). Yet there remains a severe paucity of known binary central stars required to test the binary hypothesis and to place strong constraints on the physics of the common-envelope (CE) phase of binary stellar evolution. Large photometric surveys offer an unrivalled opportunity to efficiently discover many binary central stars. We have combined photometry from the OGLE microlensing survey with the largest sample of PNe towards the Galactic bulge to systematically search for new binaries. A total of 21 periodic binaries were found thereby more than doubling the known sample. The orbital period distribution was found to be best described by CE population synthesis models when no correlation between primary and secondary masses is assumed for the initial mass ratio distribution. A comparison with post-CE white dwarf binaries indicates both distributions are representative of the true post-CE period distribution with most binaries exhibiting periods less than one day. A close binary fraction of 12-21% is derived and is the first robust and independent validation of the previous 10-15% estimate. This suggests that binarity is not a precondition for the formation of PNe and that close binaries do not play a dominant role in the shaping of nebular morphologies. Systematic effects and biases of the survey are discussed with implications for future photometric surveys.

Affiliations:

Le document en format XML

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<front><div type="abstract" xml:lang="en">Binarity has been hypothesised to play an important, if not ubiquitous, role in the formation of planetary nebulae (PNe). Yet there remains a severe paucity of known binary central stars required to test the binary hypothesis and to place strong constraints on the physics of the common-envelope (CE) phase of binary stellar evolution. Large photometric surveys offer an unrivalled opportunity to efficiently discover many binary central stars. We have combined photometry from the OGLE microlensing survey with the largest sample of PNe towards the Galactic bulge to systematically search for new binaries. A total of 21 periodic binaries were found thereby more than doubling the known sample. The orbital period distribution was found to be best described by CE population synthesis models when no correlation between primary and secondary masses is assumed for the initial mass ratio distribution. A comparison with post-CE white dwarf binaries indicates both distributions are representative of the true post-CE period distribution with most binaries exhibiting periods less than one day. A close binary fraction of 12-21% is derived and is the first robust and independent validation of the previous 10-15% estimate. This suggests that binarity is not a precondition for the formation of PNe and that close binaries do not play a dominant role in the shaping of nebular morphologies. Systematic effects and biases of the survey are discussed with implications for future photometric surveys.</div>
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Serveur d'exploration sur les relations entre la France et l'Australie

Binary planetary nebulae nuclei towards the Galactic bulge I. Sample discovery, period distribution, and binary fraction

Binary planetary nebulae nuclei towards the Galactic bulge I. Sample discovery, period distribution, and binary fraction

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

	Serveur d'exploration sur les relations entre la France et l'Australie
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