A New Grid of Synthetic Spectra for the Analysis of [WC]-type Central Stars of Planetary Nebulae

Abstract

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 (post-AGB) objects hotter than 50000 K, migrating along the constant luminosity branch of the Hertzsprung-Russell diagram (HRD). 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-LTE, 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, i.e., 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 of the stellar spectrum as stars evolve through the central star of planetary nebula (CSPN) phase. We show the effect of major physical parameters on spectral lines in the 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 in 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 far-UV, UV, optical, and IR spectral regions, is available on-line.

References in corpus (25)

• The Galaxy Evolution Explorer: A Space Ultraviolet Survey Mission
• A Grid of NLTE Line-Blanketed Model Atmospheres of O-type Stars
• Updated stellar yields from Asymptotic Giant Branch models
• A Grid of NLTE Line-Blanketed Model Atmospheres of Early B-type Stars
• Chemical yields from low- and intermediate-mass stars: model predictions and basic observational constraints
• The Element Abundances in Bare Planetary Nebula Central Stars and the Shell Burning in AGB Stars
• A grid of synthetic ionizing spectra for very hot compact stars from NLTE model atmospheres
• Neglecting the porosity of hot-star winds can lead to underestimating mass-loss rates
• O stars with weak winds: the Galactic case
• Evolution on the AGB and beyond: On the formation of H-deficient post-AGB stars
• The Magellanic Cloud Calibration of the Galactic Planetary Nebula Distance Scale
• Full evolutionary models for PG1159 stars. Implications for the helium-rich O(He) stars
• Catalogs of Hot White Dwarfs in the Milky Way from GALEX's Ultraviolet Sky Surveys. Constraining Stellar Evolution
• The Enigmatic X-ray Point Sources at the Central Stars of NGC 6543 and NGC 7293
• Statistical Properties of the GALEX/SDSS matched source catalogs, and classification of the UV sources
• Galactic planetary nebulae with Wolf-Rayet nuclei. II. A consistent observational data set
• Detailed Far-UV to Optical Analysis of Four [WR] Stars
• The Effective Temperatures of Hot Stars II. The Early-O Types
• Discovery of photospheric argon in very hot central stars of planetary nebulae and white dwarfs
• Far-UV Spectroscopic Analyses of Four Central Stars of Planetary Nebulae
• Central Stars of Planetary Nebulae in the Large Magellanic Cloud: A Far-UV Spectroscopic Analysis
• Chandra Observations of Associates of $\eta$ Car: I. Luminosities
• SwSt 1: an O-rich planetary nebula around a C-rich central star
• Discovery of NeVII in the Winds of Hot Evolved Stars
• Comprehensive modelling of the planetary nebula LMC-SMP 61 and its [WC]-type central star

Cited by in corpus (7)

• UV spectral analysis of very hot H-deficient [WCE]-type central stars of planetary nebulae: NGC 2867, NGC 5189, NGC 6905, Pb 6, and Sand 3
• Catalog of Planetary Nebulae detected by GALEX and corollary optical surveys
• The Effective Temperatures of O-type Stars from UV spectroscopy
• Central stars of planetary nebulae: The white dwarf connection
• Hot Stars in the GALEX Ultraviolet Sky Surveys (GUVcat_AISxSDSS_HS) and the Binary Fraction of Hot Evolved Stars
• Planetary nebulae with Wolf-Rayet-type central stars -- III. A detailed view of NGC 6905 and its central star
• A Survey for hot Central Stars of Planetary Nebulae I. Methods and First Results