Successful spectral synthesis of Zeeman-split molecular bands in sunspot spectra

Citation
Sv. Berdyugina et al., Successful spectral synthesis of Zeeman-split molecular bands in sunspot spectra, ASTRON ASTR, 364(2), 2000, pp. L101-L104
Citations number
21
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMY AND ASTROPHYSICS
ISSN journal
0004-6361 → ACNP
Volume
364
Issue
2
Year of publication
2000
Pages
L101 - L104
Database
ISI
SICI code
0004-6361(200012)364:2<L101:SSSOZM>2.0.ZU;2-X
Abstract
We present the first spectral synthesis of Zeeman-split Stokes profiles of the MgH A(2)II-X(2)Sigma green system and TiO gamma -system. The calculatio ns involve different regimes of the molecular Zeeman effect, up to the comp lete Paschen-Back effect for individual lines. The synthetic spectra are co mpared with observations of Stokes I and V in sunspot umbrae. We find that although the Stokes I spectra are reasonably reproduced, some lines are obv iously still missing from the employed line lists. The Stokes V spectra tur n out to be much cleaner since the missing lines do not appear to be Zeeman -split. We thus provide the first good fit to Zeeman-split molecular lines, including profiles with unconventional Stokes V shapes, determined by the Paschen-Back effect.