Physics – Optics
Scientific paper
Nov 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974apj...194l..47a&link_type=abstract
Astrophysical Journal, vol. 194, Nov. 15, 1974, pt. 2, p. L47-L50. NASA-supported research
Physics
Optics
44
Hydrogen, Line Spectra, Magnetic Stars, Stellar Magnetic Fields, Stellar Spectra, White Dwarf Stars, Astronomical Models, Balmer Series, Cassegrain Optics, Magnetic Effects, Spectrophotometry, Spectrum Analysis, Zeeman Effect
Scientific paper
The spectrum of the white dwarf suspect, GD 90, is shown to contain broad Balmer lines with resolved Zeeman structure. All the observed features correspond to the calculated spectrum of hydrogen at 5 plus or minus 0.5 MG. A region of approximately 20% of the observed stellar disk must be subject to a reasonably uniform field of this strength. The sigma components of the Zeeman patterns in H beta and H gamma are found to be circularly polarized, indicating that the field has a component directed along the line of sight. There is evidence for an additional stronger and less homogeneous field, as would be expected if the dominant 5 -MG region were at the equator of a dipolar field.
Angel James Roger P.
Beaver Edward A.
Carswell Robert F.
Harms Richard
Strittmatter Peter A.
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