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MULTIWAVELENGTH MODELLING OF THE ACCRETION REGION IN POLARS

Grant number: 08/09619-5
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): March 01, 2009
Effective date (End): February 28, 2013
Field of knowledge:Physical Sciences and Mathematics - Astronomy - Stellar Astrophysics
Principal researcher:Cláudia Vilega Rodrigues
Grantee:Karleyne Medeiros Gomes da Silva
Home Institution: Instituto Nacional de Pesquisas Espaciais (INPE). Ministério da Ciência, Tecnologia e Inovações (Brasil). São José dos Campos , SP, Brazil
Associated research grant:01/12589-1 - Stars, the interstellar medium and their interrelationships, AP.TEM

Abstract

This project focuses on the accretion-induced emission from polars, a sub-class of the magnetic cataclysmic variables. Most of the observed flux of these systems, from the optical to the hard X-ray energies, comes from the so called post-shock region: a small part of the accretion column near the white-dwarf surface. The stellar components and a large portion of the mass-transfer structure play a minor role in the emission from these systems. The main radiative processes are cyclotron, bremsstrahlung, and black body. We propose to develop a computational tool to simultaneously model the optical and X-ray emission of AM Her systems. Our group has already developed codes to calculate the cyclotron emission from the post-shock region and to adjust a model to a set of observational data. In this project, we aim to improve such a code, including the bremsstrahlung from the accretion region and a reprocessed component from the white-dwarf surface, the fundamental radiative processes in high energies. We are going to apply the model to objects having data on a broad range of wavelengths and covering different epochs in order to study the physical and geometrical properties of the post-shock regions of polars, including possible changes related to the different accretion rates.

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
SILVA, K. M. G.; RODRIGUES, C. V.; COSTA, J. E. R.; DE SOUZA, C. A.; CIESLINSKI, D.; HICKEL, G. R. Stokes imaging of AM Her systems using 3D inhomogeneous models - II. Modelling X-ray and optical data of CP Tucanae. Monthly Notices of the Royal Astronomical Society, v. 432, n. 2, p. 1587-1599, JUN 2013. Web of Science Citations: 5.

Please report errors in scientific publications list by writing to: cdi@fapesp.br.