Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.251p..37b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 251, July 15, 1991, p. 37P-40P.
Astronomy and Astrophysics
Astronomy
39
Binary Stars, Cataclysmic Variables, Cyclotron Radiation, Infrared Spectra, Light Curve, Cyclotron Frequency, Dwarf Stars, Infrared Astronomy, Stellar Models
Scientific paper
Spectroscopic observations of the magnetic cataclysmic variable AM Herculis covering the wavelength range 1.0-2.5 microns are presented. The observations were obtained during the faint state of the system's long-term light variations. During the faint phase of the binary cycle a spectrum is seen which appears to be dominated by the radiation from the M-dwarf secondary, showing deep absorptions due to H2O at around 1.4 and 1.9 microns. The spectrum can be well fitted with an M-dwarf model atmosphere for an effective temperature of 3250 K. During the bright phase of the binary cycle there is excess flux which is attributed to cyclotron radiation. If the faint phrase, M-dwarf spectrum is subtracted from the bright phase, the resulting spectrum shows a series of maxima which can be identified with cyclotron emission harmonics from a field of 14.5 MG.
Bailey Jeremy
Ferrario Lilia
Wickramasinghe Dayal T.
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