Résumé
De 1973 à 1979, on observe une diminution de l'intensité des raies d'émission et du continuum de HR Del au cours du temps.
En 1978, on note la disparition des raies de haute excitation.
La répartition énergétique spectrale dans le continu reste sensiblement la même dans l'intervalle 4000–5000 Å. Le fort excès ultraviolet trouvé de 3600 à 3250 Å est confirmé par les observations dans l'ultraviolet lointain effectuées à l'aide du satellite IUE.
Nos observations montrent un important changement dans la structure des raies 4959 et 5007 Å de [Oiii] entre 1973 et 1976, les composantes polaires devenant plus faibles que les composantes équatoriales.
Abstract
From 1973 to 1979, the intensity of emission lines and continuum of HR Del has steadily diminished.
High excitation lines have disappeared in 1978.
The spectral energy repartition in the continuum remains the same in the spectral range 4000–5000 Å. The strong ultraviolet excess found in the spectral range 3600–3250 Å is confirmed by IUE satellite observations in the ultraviolet.
Our observations show an important change in the structure of the [Oiii] lines 4959 and 5007 Å between 1973 and 1976, the polar components becoming weaker than the equatorial ones.
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Andrillat, Y., Fehrenbach, C. Evolution du spectre de HR Del de 1973 À 1979. Astrophys Space Sci 76, 149–157 (1981). https://doi.org/10.1007/BF00651251
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DOI: https://doi.org/10.1007/BF00651251