Spectroscopy of the shell episode of Eta CAR (1981-1983)

Details Spectroscopy of the shell episode of Eta CAR (1981-1983) Spectroscopy of the shell episode of Eta CAR (1981-1983)

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...137...79z&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 137, no. 1, Aug. 1984, p. 79-84. Sponsorship: Deutsche Forschungsgemeinschaft.

Astronomy and Astrophysics

Astrophysics

86

Stellar Envelopes, Stellar Mass Ejection, Variable Stars, Balmer Series, Emission Spectra, Infrared Spectra, Light Curve, Spectrum Analysis, Stellar Spectrophotometry, Visible Spectrum

Scientific paper

High-dispersion spectra of Eta-Car obtained in March 1974, Dec. 1981, and Feb. 1983 have been compared. The spectrum of Dec. 1981 shows conspicuous deviations from the usual spectral appearance of Eta Car; all lines originating from high ionization and/or excitation levels have dramatically faded. The P Cygni characteristics of the Balmer lines are more pronounced in the spectra of 1981 and 1983. The spectroscopic variations are explained as a result of changing ionization/excitation conditions due to an episodic ejection of a dense shell with a maximum velocity of about 600 km/s. The dense shell screens the UV radiation of the hot core supposed to produce the highly ionized and/or excited atoms in the extended envelope aroung Eta Car.

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