The infrared spectrum and variability of Eta Carinae

Details The infrared spectrum and variability of Eta Carinae The infrared spectrum and variability of Eta Carinae

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.203..385w&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 203, Apr. 1983, p. 385-392.

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38

Astronomical Photometry, Infrared Spectra, Nebulae, Atomic Spectra, Brightness, Cosmic Dust, Helium Atoms, Infrared Absorption, Interstellar Extinction, Line Spectra, Luminous Intensity, Optical Thickness, Variability

Scientific paper

JHKL photometry shows a slow brightening of η Car between 1972 and 1980 with a more rapid increase in 1980/81. The total range is about 0.4 mag at K. The visual brightness also increased in 1972-82. Unless variable neutral extinction is involved the brightness variations imply simultaneous changes in the dust emission and at least one other component in the system. This is consistent with these components being powered by a single (variable) central source. Variable He I lines are noted in the infrared and optical regions. The He I line intensity ratios show that the nebula is optically thick in the He I resonance line at 584 Å.

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