Zeeman-Doppler imaging of active stars. II - Numerical simulation and first observational results

Details Zeeman-Doppler imaging of active stars. II - Numerical simulation and first observational results Zeeman-Doppler imaging of active stars. II - Numerical simulation and first observational results

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...225..467d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 225, no. 2, Nov. 1989, p. 467-478.

Statistics

Computation

29

Computational Astrophysics, Doppler Effect, Late Stars, Stellar Activity, Zeeman Effect, Circular Polarization, Magnetic Flux, Stellar Atmospheres, Stellar Magnetic Fields

Scientific paper

A numerical study is proposed for testing the sensitivity and resolving ability of the Zeeman-Doppler Imaging (DZI) of active stars. It is shown that, in a star with v sin i = 32 km/s, a line at 6000 A with a Lande factor of two can be used to detect a 1000 G single magnetic spot covering 10 percent of the visible stellar surface, provided S/N = 350 or greater per 80 mA pixel. It is also shown that this 1000 G magnetic threshold is lowered by a factor of two in the case of a Doppler-resolved bipolar group, each spot of which covers 10 percent of the visible stellar hemisphere.

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