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  Polarized Line Formation in Spherically Symmetric Expanding Atmospheres

Megha, A., Sampoorna, M., Nagendra, K. N., Anusha, L. S., & Sankarasubramanian, K. (2019). Polarized Line Formation in Spherically Symmetric Expanding Atmospheres. The Astrophysical Journal, 879(1): 48. doi:10.3847/1538-4357/ab24cc.

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Genre: Journal Article

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 Creators:
Megha, A, Author
Sampoorna, M, Author
Nagendra, K N, Author
Anusha, L. S.1, Author              
Sankarasubramanian, K, Author
Affiliations:
1Max Planck Institute for Solar System Research, Max Planck Society, ou_1125546              

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 Abstract: We consider the problem of polarized line formation in the spherically symmetric expanding atmospheres. The velocity fields in line forming regions produce Doppler shift, aberration of photons and also gives rise to advection. These in turn can modify the amplitudes and shapes of the emergent Stokes profiles. However, here we consider only non-relativistic regime, wherein mainly Doppler shift effects are significant. Thus only Doppler shift terms are considered in the polarized transfer equation. For the solution of the concerned polarized transfer equation we use the co-moving frame formulation, and apply the Accelerated Lambda Iteration (ALI) method. We present the results by considering the scattering on a two-level atom, including the effects of partial frequency redistribution (PFR). The polarized line profiles are shown for few velocity laws, representative of expanding spherical atmospheres. It is shown that the degree of polarization in the lines depends sensitively on the extendedness R of the spherical atmosphere. We also present a comparison of polarized profiles computed under complete frequency redistribution (CFR) and PFR in the case of static as well as expanding atmospheres.

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Language(s): eng - English
 Dates: 2019
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.3847/1538-4357/ab24cc
 Degree: -

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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 879 (1) Sequence Number: 48 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3