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Howarth, Richard J.

doi:10.1007/978-3-319-57315-1_16

Cited by 1 publication

(1 citation statement)

References 371 publications

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“…Depending on the internal mixing processes, the components of a massive overcontact system can either merge or shrink within their Roche-lobes and continue to evolve via the chemically homogeneous evolution pathway (Langer 2012;Marchant et al 2016;. Uncertainties in the evolution of these systems is further exacerbated by the lack of observational constraints: So far only eight overcontact systems are known (Almeida et al 2015;Lorenzo et al 2014Lorenzo et al , 2017Hilditch et al 2005;Howarth et al 2015;Popper 1978;Penny et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic patch model for massive stars using PHOEBE II and FASTWIND

Abdul-Masih

Sana

Conroy

et al. 2020

A&A

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Context. 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. Aims. 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 . Methods. In using the Wilson-Devinney-like code phoebe in combination with the nonlocal 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. Results. 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.

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