Interpreting the MgiihandkLine Profiles of Mira Variables | Zendy

Brian E. Wood | Zendy; Margarita Karovska | Zendy

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Interpreting the MgiihandkLine Profiles of Mira Variables

Author(s) -

Brian E. Wood,

Margarita Karovska

Publication year - 2000

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/317131

Subject(s) - radiative transfer , physics , astrophysics , redistribution (election) , scattering , ionization , rest frame , line (geometry) , stellar atmosphere , shock (circulatory) , computational physics , stars , galaxy , ion , optics , geometry , mathematics , redshift , quantum mechanics , medicine , politics , political science , law

We use radiative transfer calculations to reproduce the basic appearance ofMg II lines observed from Mira variables. These lines have centroids that areblueshifted by at least 30 km/s from the stellar rest frame. It is unlikelythat flow velocities in the stellar atmospheres are this fast, so radiativetransfer effects must be responsible for this behavior. Published hydrodynamicmodels predict the existence of cool, downflowing material above the shockedmaterial responsible for the Mg II emission, and we demonstrate that scatteringin this layer can result in Mg II profiles as highly blueshifted as those thatare observed. However, our models also show that scattering within the shockplays an equally strong role in shaping the Mg II profiles, and ourcalculations illustrate the importance of partial redistribution and theeffects of being out of ionization equilibrium.Comment: 14 pages, 3 figures; AASTEX v5.0 plus EPSF extensions in mkfig.sty; to appear in Ap

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