Spectroscopic patch model for massive stars using PHOEBE II and FASTWIND

Abstract

Massive stars play an important role in the mechanical and chemical evolution of galaxies. Understanding the internal processes of these stars is vital to our understanding of their evolution and eventual end products. Deformations from spherical geometry are common for massive stars; however, the tools that are currently available for the study of these systems are almost exclusively one-dimensional. We present a new spectroscopic analysis tool tailored for massive stars that deviate from spherical symmetry. This code (entitled SPAMMS) is a spectroscopic patch model that takes the three-dimensional surface geometry of the system into account to produce spectral profiles at given phases and orientations. In using the Wilson-Devinney-like code PHOEBE in combination with the non local thermodynamic equilibrium (NLTE) radiative transfer code FASTWIND, we created a three-dimensional mesh that represents the surface geometry of our system and we assigned FASTWIND emergent intensity line profiles to each mesh triangle, which take the local parameters such as temperature, surface gravity, and radius into account. These line profiles were then integrated across the visible surface, where their flux contribution and radial velocity are taken into account, thus returning a final line profile for the visible surface of the system at a given phase. We demonstrate that SPAMMS can accurately reproduce the morphology of observed spectral line profiles for overcontact systems. Additionally, we show how line profiles of rapidly-rotating single stars differ when taking rotational distortion into account, and the effects that these can have on the determined parameters. Finally, we demonstrate the code's ability to reproduce the Rossiter-Mclaughlin and Struve-Sahade effects.

arXiv comment10 pages, 10 figures, accepted for publication in A&A

References in corpus (28)

• Binary interaction dominates the evolution of massive stars
• Mass-loss predictions for O and B stars as a function of metallicity
• Pre-Supernova Evolution of Massive Single and Binary Stars
• A Computational Guide to Physics of Eclipsing Binaries. Paper I. Demonstrations and Perspectives
• Rotating Massive Main-Sequence Stars I: Grids of Evolutionary Models and Isochrones
• A new route towards merging massive black holes
• Merging binary black holes formed through chemically homogeneous evolution in short-period stellar binaries
• Atmospheric NLTE-Models for the Spectroscopic Analysis of Blue Stars with Winds. II. Line-Blanketed Models
• The chemically homogeneous evolutionary channel for binary black hole mergers: rates and properties of gravitational-wave events detectable by advanced LIGO
• Physics Of Eclipsing Binaries. II. Towards the Increased Model Fidelity
• Formation of contact in massive close binaries
• Efficiency of mass transfer in massive close binaries, Tests from double-lined eclipsing binaries in the SMC
• Low-frequency gravity waves in blue supergiants revealed by high-precision space photometry
• On the consistent treatment of the quasi-hydrostatic layers in hot star atmospheres
• The VLT-FLAMES Tarantula Survey XIV. The O-Type Stellar Content of 30 Doradus
• Physics of Eclipsing Binaries. III. Spin-Orbit Misalignment
• Discovery of the massive overcontact binary VFTS 352: Evidence for enhanced internal mixing
• The VLT-FLAMES Tarantula Survey XXV. Surface nitrogen abundances of O-type giants and supergiants
• The Struve-Sahade effect in the optical spectra of O-type binaries I. Main-sequence systems
• Clues on the Origin and Evolution of Massive Contact Binaries: Atmosphere Analysis of VFTS 352
• Spectral modelling of massive binary systems
• MY Camelopardalis, a very massive merger progenitor
• 3D radiative transfer: Continuum and line scattering in non-spherical winds from OB stars
• Tomographic Separation of Composite Spectra. XI. The Physical Properties of the Massive Close Binary HD 100213 (TU Muscae)
• The massive multiple system HD 64315
• Spectral modelling of the Alpha Virginis (Spica) binary system
• A 3D short-characteristics method for continuum and line scattering problems in the winds of hot stars
• The VLT-FLAMES Tarantula Survey. XXIII: two massive double-lined binaries in 30~Doradus

Cited by in corpus (13)

• An X-ray quiet black hole born with a negligible kick in a massive binary within the Large Magellanic Cloud
• Atmospheric NLTE models for the spectroscopic analysis of blue stars with winds. V. Complete comoving frame transfer, and updated modeling of X-ray emission
• Constraining the Overcontact Phase in Massive Binary Evolution I. Mixing in V382 Cyg, VFTS 352, and OGLE SMC-SC10 108086
• Modeling overcontact binaries, I. The effect of tidal deformation
• Properties of the Be-type stars in 30 Doradus
• Constraining the overcontact phase in massive binary evolution -- II. Period stability of known O+O overcontact systems
• The effects of rotation on massive star spectroscopic observables
• Modeling contact binaries, III. Properties of a population of close, massive binaries
• BAT99 126: A multiple Wolf-Rayet system in the Large Magellanic Cloud with a massive near-contact binary
• Distance and age of the massive stellar cluster Westerlund 1. II. The eclipsing binary W36
• Binary-object spectral-synthesis in 3D (BOSS-3D) -- Modelling H-alpha emission in the enigmatic multiple system LB-1
• Fundamental parameters of the massive eclipsing binary HM1 8
• Spectroscopic Line Modeling of the Fastest Rotating O-type Stars