Cyclotron humps in AM HER systems. IV - Variations around the orbit in MR SER

Details Cyclotron humps in AM HER systems. IV - Variations around the orbit in MR SER Cyclotron humps in AM HER systems. IV - Variations around the orbit in MR SER

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.250..692w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 250, June 15, 1991, p. 692-700. Research supported by R

Astronomy and Astrophysics

Astronomy

18

Cyclotron Radiation, Stellar Magnetic Fields, Stellar Orbits, Faint Objects, Light Curve, Stellar Mass Accretion, Zeeman Effect

Scientific paper

Phase-resolved spectroscopy of MR Ser in which cyclotron harmonics are evident are presented. These move with viewing angle. Asymmetries in the movement and profiles of the humps indicate that the cyclotron remission region is extended. This region is modeled to deduce a magnetic field of 24.5 + or - 0.5 MG. Halo Zeeman absorption features which yield a similar field are also observed, confirming that the two emission regions are closely associated. Photospheric Zeeman features yield a polar field of 26 MG (assuming a centered dipole) consistent with the field in the cyclotron and halo emission regions if these are some 20 deg from the magnetic pole.

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