Towards Understanding The B[e] Phenomenon: IV. Modeling of IRAS 00470+6429

Abstract

FS CMa type stars are a recently described group of objects with the B[e] phenomenon that exhibit strong emission-line spectra and strong IR excesses. In this paper we report the first attempt for a detailed modeling of IRAS 00470+6429, for which we have the best set of observations. Our modeling is based on two key assumptions: the star has a main-sequence luminosity for its spectral type (B2) and the circumstellar envelope is bimodal, composed of a slowly outflowing disk-like wind and a fast polar wind. Both outflows are assumed to be purely radial. We adopt a novel approach to describe the dust formation site in the wind that employs timescale arguments for grain condensation and a self-consistent solution for the dust destruction surface. With the above assumptions we were able to reproduce satisfactorily many observational properties of IRAS 00470+6429, including the H line profiles and the overall shape of the spectral energy distribution. Our adopted recipe for dust formation proved successful in reproducing the correct amount of dust formed in the circumstellar envelope. Possible shortcomings of our model, as well as suggestions for future improvements, are discussed.

11 pages, 7 figures, accepted for publication in The Astrophysical Journal

References in corpus (5)

• Non-LTE Monte Carlo Radiative Transfer: II. Non-Isothermal Solutions for Viscous Keplerian Disks
• On the Determination of the Rotational Oblateness of Achernar
• Achernar: Rapid Polarization Variability as Evidence of Photospheric and Circumstellar Activity
• Toward Understanding The B[e] Phenomenon: III. Properties of the optical counterpart of IRAS 00470+6429
• Axi-symmetric Models of B[e] Supergiants: I. The Effective Temperature and Mass-loss Dependence of the Hydrogen and Helium Ionization Structure

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• First detection of a magnetic field in low-luminosity B[e] stars: New scenarios for the nature and evolutionary stages of FS CMa stars
• Fast ray-tracing algorithm for circumstellar structures (FRACS). II. Disc parameters of the B[e] supergiant CPD-57° 2874 from VLTI/MIDI data
• 2.5-MHD models of circumstellar discs around FS~CMa post-mergers : I. Non-stationary accretion stage
• Fast ray-tracing algorithm for circumstellar structures (FRACS) I. Algorithm description and parameter-space study for mid-IR interferometry of B[e] stars
• 2.5-MHD models of circumstellar discs around FS~CMa post-mergers : II. Stationary accretion stage
• Intermediate-Mass Mergers: A New Scenario for Several FS CMa Stars
• Angular Momentum Loss Rates in Be Stars Determined by the Viscous Decretion Disc Model
• New Insight into the FS CMa System MWC 645 from Near-Infrared and Optical Spectroscopy