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H-Functions in Radiative Transfer Theory : Calculation of Voigt Functions and Justification of a Model for Formation of Cyclotron Lines in the Spectra of Neutron Stars. / Grigoryev, V. V.; Nagirner, D. I.; Grachev, S. I.
в: Astrophysics, Том 62, № 1, 01.03.2019, стр. 129-146.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - H-Functions in Radiative Transfer Theory
T2 - Calculation of Voigt Functions and Justification of a Model for Formation of Cyclotron Lines in the Spectra of Neutron Stars
AU - Grigoryev, V. V.
AU - Nagirner, D. I.
AU - Grachev, S. I.
N1 - Publisher Copyright: © 2019, Springer Science+Business Media, LLC, part of Springer Nature. Copyright: Copyright 2019 Elsevier B.V., All rights reserved.
PY - 2019/3/1
Y1 - 2019/3/1
N2 - After a brief discussion of the history of the introduction of H-functions into radiative transfer theory, the equations for these functions are introduced and explicit expressions given for them. Formulas are also given for calculating the direction and frequency distributions of radiation emerging from a semi-infinite medium with different external and internal sources. An algorithm for calculating Voigt H-functions and related quantities is described in detail. A modern free code has been developed in Fortran language for implementing this algorithm. This code can be used to calculate the profiles of spectral lines with a Voigt absorption line profile with high accuracy. Examples of line profile calculations are shown and a qualitative justification of a hypothesis for the formation of cyclotron features in the spectra of neutron stars is given.
AB - After a brief discussion of the history of the introduction of H-functions into radiative transfer theory, the equations for these functions are introduced and explicit expressions given for them. Formulas are also given for calculating the direction and frequency distributions of radiation emerging from a semi-infinite medium with different external and internal sources. An algorithm for calculating Voigt H-functions and related quantities is described in detail. A modern free code has been developed in Fortran language for implementing this algorithm. This code can be used to calculate the profiles of spectral lines with a Voigt absorption line profile with high accuracy. Examples of line profile calculations are shown and a qualitative justification of a hypothesis for the formation of cyclotron features in the spectra of neutron stars is given.
KW - cyclotron feature
KW - radiative transfer theory
KW - spectral lines
KW - Voigt line profile
UR - http://www.scopus.com/inward/record.url?scp=85062598598&partnerID=8YFLogxK
U2 - 10.1007/s10511-019-09569-4
DO - 10.1007/s10511-019-09569-4
M3 - Article
AN - SCOPUS:85062614831
VL - 62
SP - 129
EP - 146
JO - Astrophysics
JF - Astrophysics
SN - 0571-7256
IS - 1
ER -
ID: 71756911