The influence of vertical magnetic field gradients on the measured field strength and filling factor in late-type stars

Details The influence of vertical magnetic field gradients on the measured field strength and filling factor in late-type stars The influence of vertical magnetic field gradients on the measured field strength and filling factor in late-type stars

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...238..279g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 238, no. 1-2, Nov. 1990, p. 279-282.

Astronomy and Astrophysics

Astrophysics

11

Field Strength, Late Stars, Line Spectra, Stellar Atmospheres, Stellar Magnetic Fields, Stellar Models, Dwarf Stars, Radiative Transfer, Solar Magnetic Field, Stokes Law Of Radiation

Scientific paper

The influence of a vertical gradient of the magnetic field in late type stars on the measurement of magnetic field strengths and filling factors is studied. Line profiles and contribution functions of spectral lines with large Lande factors are calculated in model stellar atmospheres in the presence of a magnetic field with a vertical gradient. It is found that the four lines, which have often been used to measure solar and stellar magnetic fields in the past, are formed at heights sufficiently different to account for differences in apparent field strength of up to 1000 G if the fields are assumed to be similarly structured as in the sun. Thus it is concluded that the vertical gradient of the field may contribute to a good part of the discrepancy between different published measurements of field strength and filling factor in the K2 dwarf Epsilon-Eri.

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