Ref: ASTROimport-644

Spectroscopic and photometric observations of the recurrent nova IM Normae

Duerbeck, H. W. ; Sterken, C. ; Baptista, R. ; Diaz, M. P. ; Dutra, C. M. ; Freyhammer, L. ; Hensberge, H. ; Jones, A. F.

published in Classical Nova Explosions, 637, pp. 299-302 (2002)

Abstract: The outburst of the recurrent nova IM Nor was followed visually and spectroscopically. In the beginning of the outburst, the nova belonged to Williams' Fe II class, but one month later, the spectrum changed to the He/N class. Thus IM Nor is a member of the hybrid class of novae, and has many spectroscopic similarities with CI Aql and T Pyx, the two other slow recurrent novae observed until now. In early February, the radial velocity of the Fe II emission lines was +220 +/- 35 km/s, the main absorption had -682 +/- 4 km/s, and a faint absorption component -902 +/- 1 km/s. The strengths of the interstellar Ca II, Na I, and K I lines as well as those of the diffuse interstellar bands indicate an interstellar extinction EB-V >= 0.8 and a distance d >= 2.5 kpc. The (uncertain) conclusion is that the absolute magnitude of IM Nor is comparable to that of classical novae of the same speed class.

DOI: 10.1063/1.1518218
Links: link

The record appears in these collections:
Royal Observatory of Belgium > Astronomy & Astrophysics
Science Articles > Non-refereed Articles

 Record created 2016-07-01, last modified 2016-07-01