Nova Delphini 1967. Observations du spectre nebulaire entre 5600 et 8800 Å en 1970 |
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| Authors: | Yvette Andrillat Léo Houziaux |
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| Institution: | (1) Faculté des Sciences, Laboratoire d'Astronomie, Montpellier, France;(2) Département d'Astrophysique, Université de Mons, Mons, Belgique |
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| Abstract: | Five 230 Å/mm infrared spectra of Nova Delphini 1967 have been obtained from May to September 1970 on Kodak hypersensitized IN plates. Visual brightness has dropped by one magnitude between fall 1969 and fall 1970. The continuous spectrum remains strong and a mean value of 2.35 is found for the gradient in the region 6000–8000 Å, indicating a slight increase in temperature since 1969. Permitted lines ofHi,Oi, Hei, Feii are weakening, while intensities of forbidden transitions due Nii], Fevii], Oi], Oii], Aiii], Av], Fevii], Fex], Fexi], Fexi], Nixv] are much more stable At the dispersion of our spectra, there is little evidence of activity in the nova shell during 1970. Temperature seems to be slightly increasing in the lower layers as well as in the external, low density regions.
Les observations ont été effectuées à l'Observatoire de Haute-Provence (C.N.R.S.) |
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