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Spectral evolution of the two classical novae PW Vul and V1668 Cyg using International Ultraviolet Explorer low‑resolution spectra

Sanad, M. R.; Yousef, S.; Essam, A. +2 more

We studied the evolution of the normalized flux of selected ultraviolet (UV) emission lines of two classical novae (PW Vul and V1668 Cyg) using International Ultraviolet Explorer (IUE) short wavelength observations. Different phases of the outburst are studied. Emission lines covering a wide range of ionization states are investigated. We use the …

A 2007 photometric study and UV spectral analysis of the Wolf-Rayet binary V444 Cyg

Ekmekçi, F.; Eriş, F. Z.

Photometric and spectroscopic characteristics of the WN5+O6 binary system, V444 Cyg, were studied. The Wilson-Devinney (WD) analysis, using new BV observations carried out at the Ankara University Observatory, revealed the masses, radii, and temperatures of the components of the system as M_WR=10.64 M_⊙, M_O=24.68 M

The interstellar 2200 A band : a second catalogue of equivalent widths and preliminary staistical analysis.

Dorschner, J.; Guertler, J.; Friedemann, C. +1 more

A second catalogue of equivalent widths of the interstellar 2200-A band is presented. It is based on spectrophotometric data obtained with the TD-I satellite and supplements the catalogue of Guertler et al. (1982). Both catalogues list a total of 779 stars. The reliability of the derived parameters is analyzed. There is a satisfying agreement with…