Observations of the magnetic white dwarf GD 90

Details Observations of the magnetic white dwarf GD 90 Observations of the magnetic white dwarf GD 90

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...218..227b&link_type=abstract

Astrophysical Journal, Part 1, vol. 218, Nov. 15, 1977, p. 227-231. Research supported by the University of Michigan.

Astronomy and Astrophysics

Astrophysics

6

H Beta Line, H Gamma Line, Magnetic Stars, Stellar Models, White Dwarf Stars, Zeeman Effect, Astronomical Models, Balmer Series, Circular Polarization, Gravitational Effects, Magnetic Effects, Magnetic Flux

Scientific paper

The white dwarf GD 90 has been found to manifest Zeeman structure in H beta and H gamma. This indicates the existence of a magnetic field of approximately 5 x 10 to the 6th gauss. GD 90 has been observed for broadband circularly polarized radiation in the 3500-5500 A wavelength region. The value of broadband circular polarization is found to be -0.15 plus or minus 0.09%. The value of the magnetic field, expected on the basis of a magnetoabsorption version of Kemp's model, is estimated to be -0.58 plus or minus 0.15%, or, including Balmer edge effects, -0.4 plus or minus 0.2%. This shows that the upper limit on broadband circular polarization set by observation is consistent with magnetoabsorption calculations based on a field derived from Zeeman splitting only when the Balmer edge is invoked. A spectroscopic observation of GD 90 has been found to be consistent with previous work, eliminating any possibility that the magnetic field, as detected by the Zeeman components of H beta, is variable.

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