Statistics – Computation
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mast.conf..175k&link_type=abstract
Magnetic stars, Proceedings of the International Conference, held in the Special Astrophysical Observatory of the Russian AS, Au
Statistics
Computation
Magnetic Fields, Abundances, Analytical
Scientific paper
Here we present a new spectrum synthesis code SynthM for magnetic stars. SynthM works under the assumption of LTE in a plane-parallel atmosphere and is based on the non-magnetic spectrum synthesis code SynthVa of prof. V.Tsymbal. The SynthM code includes anomalous Zeeman pattern calculation, computation of local IQUV Stokes and disk integration algorithm. The transfer equation is solved by DELO method with quadratic approximation for the source function. The code allows use of two built-in analytical models of stellar magnetic field configuration (one of which identical to Piskunov's SynthMag model and the other is based on conception of "virtual" magnetic charges). Also, it is possible to use an arbitrary model of magnetic field configuration by setting the modulus and direction of field for each integrating node of a surface grid. Two integration methods are included in the code. SynthM allows one to calculate synthetic spectrum with preset stratification of abundances. SynthM is written in Fortran 95. The comparison of calculated IQUV Stokes shows good agreement between the SynthM and SynthMag (Piskunov 1999) codes. The practical application of the designed code is illustrated by the example of synthetic spectrum test calculation for the region 6146-6150 Å of the observed spectrum of β CrB.
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