Journal Article

A new grid of synthetic spectra for the analysis of [WC]-type central stars of planetary nebulae

Graziela R. Keller, James E. Herald, Luciana Bianchi, Walter J. Maciel and Ralph C. Bohlin

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 418, issue 2, pages 705-728
Published in print December 2011 | ISSN: 0035-8711
Published online November 2011 | e-ISSN: 1365-2966 | DOI:
A new grid of synthetic spectra for the analysis of [WC]-type central stars of planetary nebulae

More Like This

Show all results sharing this subject:

  • Astronomy and Astrophysics


Show Summary Details


We present a comprehensive grid of synthetic stellar-atmosphere spectra, suitable for the analysis of high-resolution spectra of hydrogen-deficient post-asymptotic giant branch objects hotter than 50 000 K, migrating along the constant luminosity branch of the Hertzsprung–Russell diagram. The grid was calculated with cmfgen, a state-of-the-art stellar atmosphere code that properly treats the stellar winds, accounting for expanding atmospheres in non-local thermodynamic equilibrium, line blanketing, soft X-rays and wind clumping. We include many ionic species that have been previously neglected. Our uniform set of models fills a niche in an important parameter regime, that is, high effective temperatures, high surface gravities and a range of mass-loss values. The grid constitutes a general tool to facilitate determination of the stellar parameters and line identifications and to interpret morphological changes in the stellar spectrum as stars evolve through the central star of planetary nebula phase. We show the effect of major physical parameters on spectral lines in the far-ultraviolet (far-UV), UV and optical regimes. We analyse UV and far-UV spectra of the central star of NGC 6905 using the grid to constrain its physical parameters, and proceed to further explore other parameters not taken into consideration in the grid. This application shows that the grid can be used to constrain the main photospheric and wind parameters, as a first step towards a detailed analysis. The full grid of synthetic spectra, comprising of far-UV, UV, optical and infrared spectral regions, is available online.

Keywords: stars: AGB and post-AGB; stars: atmospheres; stars: individual: NGC 6905; stars: low-mass; stars: mass-loss; stars: winds, outflows

Journal Article.  11783 words.  Illustrated.

Subjects: Astronomy and Astrophysics

Full text: subscription required

How to subscribe Recommend to my Librarian

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.