Physics
Scientific paper
Sep 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.281...47v&link_type=abstract
Nature, vol. 281, Sept. 6, 1979, p. 47, 48.
Physics
55
Absorption Spectra, Binary Stars, Light Curve, Stellar Spectrophotometry, Variable Stars, Circular Polarization, Emission Spectra, Line Spectra, Linear Polarization, Optical Polarization
Scientific paper
VV Puppis is an AM Herculis type binary system exhibiting variable circular and linear polarization (Hiltner, 1979). In its 'normal' state, the optical light curve shows a slow rise to maximum (m-max about 15-16) and a rapid drop to minimum (m-min about 17.5-18) where it remains for about 60% of its 100-min period. However, the system has also been observed in faint inactive states (Tapia, 1979). Only a few spectroscopic observations of VV Pup have been published and these show a continuous spectrum with emission lines of hydrogen and helium superimposed. The paper presents spectrophotometric observations obtained on 2 February 1979. Broad absorption features are seen for the first time in this object in the optical spectrum during the bright phases with high circular polarization. It is suggested that these features be identified with the 6th, 7th and 8th harmonics of cyclotron absorption in a magnetic field of about 30 million G.
Visvanathan Natarajan
Wickramasinghe Dayal T.
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