Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...300..804s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 300, Jan. 15, 1986, p. 804-818.
Astronomy and Astrophysics
Astrophysics
89
Cataclysmic Variables, Continuous Spectra, Magnetic Stars, Polarimetry, Stellar Spectrophotometry, Visible Spectrum, Binary Stars, Stellar Mass Accretion, Stellar Models, Stellar Winds
Scientific paper
The AM Her variables represent a subset of cataclysmic variables (CVs) with strongly magnetic white dwarf primaries. The most dramatic manifestation of the field is in the brilliant, highly polarized optical cyclotron radiation emitted in the accretion column just above the stellar magnetic pole. The present paper provides circular spectropolarimetry of four additional AM Her variables, taking into account EF Eri, PG 1550 + 191, AN UMa, and VV Pup. Through new measurements of surface fields, the restricted range occupied by these systems is confirmed. The time-resolved observations provide also an opportunity to study the cyclotron spectrum and polarization in a variety of systems and over a wide range of viewing perspectives. On the basis of the obtained results, refinements are suggested to the standard accretion model. These refinements appear to bring the theory better in line with the observations that are currently available.
Grandi Steven A.
Schmidt Gary D.
Stockman Hervey S.
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