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Title: Upper limits to the magnetic field in central stars of planetary nebulae

More than about 20 central stars of planetary nebulae (CSPNs) have been observed spectropolarimetrically, yet no clear, unambiguous signal of the presence of a magnetic field in these objects has been found. We perform a statistical (Bayesian) analysis of all the available spectropolarimetric observations of CSPN to constrain the magnetic fields in these objects. Assuming that the stellar field is dipolar and that the dipole axis of the objects is oriented randomly (isotropically), we find that the dipole magnetic field strength is smaller than 400 G with 95% probability using all available observations. The analysis introduced allows integration of future observations to further constrain the parameters of the distribution, and it is general, so that it can be easily applied to other classes of magnetic objects. We propose several ways to improve the upper limits found here.
Authors:
; ; ;  [1] ;  [2]
  1. Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife (Spain)
  2. Dipartimento di Fisica e Astronomia, Università di Catania, Sezione Astrofisica, Via S. Sofia 78, I-9512 Catania (Italy)
Publication Date:
OSTI Identifier:
22356784
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 787; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DATA ANALYSIS; DIPOLES; DISTRIBUTION; MAGNETIC FIELDS; PLANETARY NEBULAE; POLARIZATION; PROBABILITY; RANDOMNESS; STARS