Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...110..316m&link_type=abstract
Astronomy and Astrophysics, vol. 110, no. 2, June 1982, p. 316-323.
Astronomy and Astrophysics
Astronomy
5
Astronomical Photometry, Infrared Astronomy, Infrared Photometry, Magnetic Stars, Visual Photometry, White Dwarf Stars, X Ray Sources, Binary Stars, Light Curve, Near Infrared Radiation, Orbital Elements, Polarization Characteristics, Spectral Energy Distribution, Stellar Color, Stellar Mass Accretion, Wavelengths
Scientific paper
Results are presented of extensive V, R, and I photometric observations of the AM Her-type system 2A 0311-227. Comparing these data with the photometric results of Verbunt et al. (1980), an orbital period of 0.0562659 + or - 4 x 10 to the -7th d is found. Fluctuations are superposed on the average V, R, and I light curves with amplitudes of approximately 15 to 20%. It is noted that these fluctuations occur preferentially at time scales near 6 min but are not periodic. The shape of the average light curves, which exhibits a progressive change with wavelength, can be described as a smooth underlying modulation (approximately the same for all wavelengths), on which a hump is superposed; the relative amplitude and duration of the hump increase with wavelength. It is suggested that, within the framework of the 'bare bones' model of White (1980) and Schneider and Young (1980), the wavelength-independent modulation derives from emission from an optically thick accretion column, viewed from different angles during an orbital cycle. The hump is seen as resulting from anisotropic red and infrared emission from the top of the accretion column.
Chevalier Clément
Ilovaisky Sergio A.
Motch Ch.
Paradijs Jan van
Pedersen Holger
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