Evolution du spectre de la Nova Delphini 1967 en 1971 et 1972 |
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| Authors: | Yvette Andrillat Charles Fehrenbach Léo Houziaux |
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| Institution: | (1) Observatoire de Haute-Provence, Forcalquier, France;(2) Département d'Astrophysique, Université de Mons, Mons, Belgique |
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| Abstract: | Continued spectroscopic observations of Nova Del 67 during 1971 and 1972 show a general decrease of the nebular and coronal emission with respect to the local continuum. The continuous spectrum exhibits a strong Balmer emission (figure 1). Equivalent widths of Hi, Hei, Heii, Oi, Oi], Oii, Oii], Oiii, Oiii], Niii, Sii], Aiii], Neiii], Nev], Fevi], Fevii], Fex], Fexi], Fexiv], Nixvi], Nixv] are listed in tables 1 and 2.Figures 5 to 10 show several line profiles, which can be interpreted in terms of a model proposed by Hutchings (1972). Kinematical properties of the nova envelope do not seem to have changed in the 1968–1972 time interval. However, a study of the Oiii] (4959 Å) line indicates that the physical conditions in the polar blobs in 1972 (T
e=10 660 K,N
e=5,5×105 cm–3) are different from those prevailing in equatorial rings (T
e=9×100 K,N
e=7×105 cm–3).
Le matérial d'observation utilisé pour cette étude a été obtenu à l'aide de téléscopes de 120 cm, 152 cm et 193 cm de l'Observatoire de Haute-Provence (CNRS). |
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