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Sun as a guide to stellar physics
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SYSNO ASEP 0511176 Druh ASEP M - Kapitola v monografii Zařazení RIV C - Kapitola v knize Název Models of Solar and Stellar Atmospheres Tvůrce(i) Heinzel, Petr (ASU-R) RID, ORCID Zdroj.dok. Sun as a guide to stellar physics. - Amsterdam : Elsevier Science BV, 2019 / Engvold O. - ISBN 9780128143346 Rozsah stran s. 157-183 Poč.str. 27 s. Poč.str.knihy 522 Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova basic set of non-LTE and RHD equations ; model atmospheres ; radiative transfer Vědní obor RIV BN - Astronomie a nebeská mechanika, astrofyzika Obor OECD Astronomy (including astrophysics,space science) CEP GA16-17586S GA ČR - Grantová agentura ČR Institucionální podpora ASU-R - RVO:67985815 DOI 10.1016/B978-0-12-814334-6.00006-6 Anotace The chapter addresses the basic principles of the radiative transfer theory and nonequilibrium plasma physics, which were developed during the past century and are now widely used to model solar and stellar atmospheres. Many key results have been obtained and new numerical methods developed by solar physicists they serve as a guide for stellar astrophysics. We start with the basics of radiation transport and demonstrate the classical ideas of the nonequilibrium line formation using a two-level atom example. Then we summarize the equations used to construct standard plane-parallel models of atmospheres in hydrostatic and radiative equilibrium and show examples of models with different levels of complexity. Although such models are well-suited for modeling photospheres, solar and stellar chromospheres require even more advanced approaches. The simplest is represented by so-called semiempirical models. We show some classical examples for the Sun and cool stars. A specific class of problems concerns isolated atmospheric structures illuminated by solar or stellar disk radiation. Based on various atmospheric models, we discuss how model spectra are synthesized and spectral lines are actually formed. Finally, we briefly introduce the topic of radiation hydrodynamics as the most sophisticated tool for solar and stellar atmospheric modeling.
Pracoviště Astronomický ústav Kontakt Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Rok sběru 2020
Počet záznamů: 1